MycologiaPub Date : 2026-03-01Epub Date: 2026-01-06DOI: 10.1080/00275514.2025.2588503
Marcin Piątek, Matthias Lutz, Nourou S Yorou, Kudzo A Guelly, Jolanta Piątek
{"title":"Smut fungi on <i>Trachypogon spicatus</i> in Africa: <i>Sporisorium trachypogonis-spicati</i> and <i>Tilletia afrotrachypogonis</i>, sp. nov.","authors":"Marcin Piątek, Matthias Lutz, Nourou S Yorou, Kudzo A Guelly, Jolanta Piątek","doi":"10.1080/00275514.2025.2588503","DOIUrl":"10.1080/00275514.2025.2588503","url":null,"abstract":"<p><p>Two smut fungi infecting the crinkle-awn grass <i>Trachypogon spicatus</i> (Poaceae) in Africa are characterized morphologically, illustrated, and linked to DNA barcodes (rDNA ITS, 28S). <i>Sporisorium trachypogonis-spicati</i> is reported for the first time from Benin, South Africa, and Togo, far from the previously known localities in the Democratic Republic of the Congo and Zimbabwe. This species is morphologically similar and closely related but genetically divergent to <i>Sporisorium trachypogonicola</i>, which infects <i>Trachypogon spicatus</i> in the Americas. <i>Tilletia afrotrachypogonis</i> is described as a new species from Togo and is also known from southeastern Africa (Malawi, Zambia). This species is morphologically almost identical to but genetically distinct from <i>Tilletia trachypogonis</i>, which infects <i>Trachypogon spicatus</i> in Mexico. The phylogenetic sister relationship, phenotype, and ecological similarity for the two species pairs <i>Sporisorium trachypogonis-spicati</i>/<i>S. trachypogonicola</i> and <i>Tilletia afrotrachypogonis</i>/<i>T. trachypogonis</i>, but occurrence in different geographic areas (Africa and the Americas/North America, respectively), suggest a common ancestral species, allopatric speciation, and duplication, i.e. speciation on the same host species.</p>","PeriodicalId":18779,"journal":{"name":"Mycologia","volume":" ","pages":"361-376"},"PeriodicalIF":2.6,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145912443","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
MycologiaPub Date : 2026-03-01Epub Date: 2026-02-02DOI: 10.1080/00275514.2025.2588505
Catarina Letícia Ferreira de Lima, Thalline Rafhaella Leite Cordeiro, Maria Alice Barbosa Dos Santos, Isabela Ferreira Leão, Francisca Robervania Soares Dos Santos, Aleksander Westphal Muniz, Lal Sahab Yadav, Hyang Burm Lee, André Luiz Cabral Monteiro de Azevedo Santiago
{"title":"The third report of Cunninghamellaceae fungi in the Brazilian Amazon forest: Two new species of <i>Cunninghamella</i> isolated from soil.","authors":"Catarina Letícia Ferreira de Lima, Thalline Rafhaella Leite Cordeiro, Maria Alice Barbosa Dos Santos, Isabela Ferreira Leão, Francisca Robervania Soares Dos Santos, Aleksander Westphal Muniz, Lal Sahab Yadav, Hyang Burm Lee, André Luiz Cabral Monteiro de Azevedo Santiago","doi":"10.1080/00275514.2025.2588505","DOIUrl":"10.1080/00275514.2025.2588505","url":null,"abstract":"<p><p>Five strains of <i>Cunninghamella</i> were isolated from Amazon forest soils in the state of Amazonas, Brazil. Strains URM 9031 and URM 9187 form sporophores with main axes ending in a vesicle or dividing into several branches with globose to subglobose sporangiola. Lateral branches can rebranch up to four times. The maximum temperature growth (Tmax) is 38 C. Strains URM 9032, URM 9199, and URM 9108 form axial sporophores ending in a vesicle or forked, with lateral branches rebranching up to four times; sporangiola are exclusively globose. The Tmax is 41 C. Based on distinct morphologies, along with physiological and multilocus phylogenetic evidence of the nuc rDNA regions ITS1-5.8S-ITS2 (internal transcribed spacer [ITS]) and partial D1-D2 domains (28S) and the elongation factor-1 alpha (<i>EF-1α</i>) gene, <i>Cunninghamella ramificata</i> sp. nov. and <i>C. amazonica</i> sp. nov. are proposed. A taxonomic discussion of both new species and an updated identification key for the <i>Cunninghamella</i> are provided.</p>","PeriodicalId":18779,"journal":{"name":"Mycologia","volume":" ","pages":"345-360"},"PeriodicalIF":2.2,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146106330","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
MycologiaPub Date : 2026-03-01Epub Date: 2026-01-29DOI: 10.1080/00275514.2025.2595894
Lydia Petersons, Mary L Berbee
{"title":"Sitting on the fence: Individuals, distributions, and reproductive strategies in the bird's nest fungus <i>Nidula candida</i>.","authors":"Lydia Petersons, Mary L Berbee","doi":"10.1080/00275514.2025.2595894","DOIUrl":"10.1080/00275514.2025.2595894","url":null,"abstract":"<p><p>Bird's nest fungi (<i>Nidula candida</i>) growing along ~18-year-old cedar fences in Pacific Spirit Regional Park, Vancouver, British Columbia, Canada, produce abundant, persistent peridia containing basidiospore-bearing, egg-like peridioles. To reconstruct the initial mode of reproduction of the populations, 37 peridia were collected following a geometric sampling design, with 8-10 peridia collected 6-222 cm apart from each of four fence segments. We cultured dikaryotic mycelium from one whole peridiole from each peridium and 105 monokaryons from basidiospores from 8 peridioles. We then tested mycelial compatibility by confronting pairs of dikaryons and sexual compatibility by mating the monokaryons from basidiospores. The resulting genetic patterns allowed us to map genetic individuals back to their fence segments. The dikaryotic mycelia that grew from whole peridioles fell into six mycelial compatibility groups, with one or two groups per 3-7 m fence segment. Consistent with an outcrossing origin, four different mycelial compatibility groups had different mating types. The largest compatibility group covered over 6 m of fence, producing 114 peridia and ~4.2 billion spores. One compatibility group was present at two fence sites ~40 m apart, suggesting asexual dispersal. This can potentially be explained by somatic growth from the walls of dispersed peridioles. Dikaryons generated by mating sibling monokaryons isolated from basidiospores from the same peridiole showed mycelial incompatibility in 86% of pairings. Thus, the compatible dikaryotic mycelia emerging from whole peridioles likely represent clones of parental mycelium rather than recombinant meiotic hyphae from basidiospores. Asexual reproduction from dispersed fruit body tissue is unusual in Agaricales, but in <i>N. candida</i> fence-hopping of peridioles splashed from peridia and germinating as clonal, parental-type dikaryotic mycelia may have contributed to expansion of a genet along the fence.</p>","PeriodicalId":18779,"journal":{"name":"Mycologia","volume":" ","pages":"270-283"},"PeriodicalIF":2.2,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146086514","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
MycologiaPub Date : 2026-03-01Epub Date: 2026-02-05DOI: 10.1080/00275514.2025.2607809
Yu-Xin Zhang, Ning Mao, Xiao-Yu Fan, Jia-Jia Yang, Li Fan
{"title":"Species diversity of Clitocybaceae from Shanxi Province of northern China, with descriptions of seven new species.","authors":"Yu-Xin Zhang, Ning Mao, Xiao-Yu Fan, Jia-Jia Yang, Li Fan","doi":"10.1080/00275514.2025.2607809","DOIUrl":"10.1080/00275514.2025.2607809","url":null,"abstract":"<p><p>Clitocybaceae, currently recognized in the suborder Tricholomatineae, has undergone significant taxonomic reevaluation through phylogenetic, phylogenomic, and morphological analyses. In this study, we surveyed the species diversity of Clitocybaceae in Shanxi Province, northern China. Phylogenetic analyses were performed using ITS (internal transcribed spacer) and six loci including ITS, 28S (large subunit ribosomal), <i>tef1</i> (translation elongation factor 1-alpha), <i>rpb1</i> (DNA-directed RNA polymerase II largest subunit 1), <i>rpb2</i> (second largest subunit of RNA polymerase II), and <i>atp6</i> (adenosine triphosphate [ATP] synthase subunit 6). Comprehensive phylogenetic analyses revealed 20 Clitocybaceae species from our collections, which are distributed in four genera, i.e. <i>Collybia, Lepista, Pseudolyophyllu.m</i>, and <i>Singerocybe</i>. Combined with morphological characteristics, 13 of them were identified as known species and seven were described and illustrated as new species in this paper. These findings significantly contribute to our understanding of Clitocybaceae diversity and taxonomy in northern China.</p>","PeriodicalId":18779,"journal":{"name":"Mycologia","volume":" ","pages":"426-441"},"PeriodicalIF":2.2,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146125819","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
MycologiaPub Date : 2026-03-01Epub Date: 2026-01-06DOI: 10.1080/00275514.2025.2586430
Arseniy A Shklyar, Yelisei S Mesentsev, Alexey V Smirnov, Elena S Nassonova
{"title":"<i>Nucleophaga amutiana</i>, sp. nov.-a novel intranuclear parasite of amoebae from the Far East of Russia expands the diversity and biogeography of microsporidia-like organisms.","authors":"Arseniy A Shklyar, Yelisei S Mesentsev, Alexey V Smirnov, Elena S Nassonova","doi":"10.1080/00275514.2025.2586430","DOIUrl":"10.1080/00275514.2025.2586430","url":null,"abstract":"<p><p>The genus <i>Nucleophaga</i> comprises poorly studied intranuclear parasites that infect amoebae. Currently classified within the phylum Rozellomycota, this genus belongs among numerous lineages with unresolved taxonomic positions, primarily identified through metagenomic studies. Three species of <i>Nucleophaga</i> were described at the morphological and molecular levels-<i>N. amoebae, N. terricolae</i>, and <i>N. striatae</i>, all isolated in Europe. Here, we report the discovery of a fourth species of the genus, isolated from the Far East of Russia, infecting nuclei of <i>Thecamoeba</i> sp. A detailed light microscopic study revealed several remarkable morphological features of this organism. For the first time, the division of <i>Nucleophaga</i> plasmodium was illustrated. Experimental infections demonstrated that <i>Thecamoeba quadrilineata</i> and <i>T. foliovenanda</i> can support the development of the parasite, whereas <i>Nucleophaga</i> showed abnormal development in <i>T. onigiri</i> and was unable to survive in <i>T. vumurta</i>. Phylogenetic analysis, based on the nuc 18S rRNA gene sequences, placed the new isolate as a distinct lineage within the genus <i>Nucleophaga</i>. Based on its molecular characteristics, the studied isolate was described as a new species, <i>Nucleophaga amutiana</i>.</p>","PeriodicalId":18779,"journal":{"name":"Mycologia","volume":" ","pages":"330-344"},"PeriodicalIF":2.6,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145912471","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Phylogenomic insights into Taphrinomycotina and genomic features of <i>Saitoella coloradoensis</i> based on whole-genome sequencing at the chromosome level, with a proposal of the new class Saitoellomycetes.","authors":"Yuuki Kobayashi, Junta Sugiyama, Rahul Sk, Yuh Shiwa, Keita Aoki, Naoto Tanaka, Masako Takashima","doi":"10.1080/00275514.2025.2589032","DOIUrl":"10.1080/00275514.2025.2589032","url":null,"abstract":"<p><p>Taphrinomycotina, a subphylum of the phylum Ascomycota, comprises fungi with diverse morphologies and ecologies. <i>Saitoella</i> and <i>Savitreella</i> are genera of red-colored yeasts within Taphrinomycotina, but their precise phylogenetic positions have remained controversial. In this study, we sequenced the whole genomes of <i>Saitoella coloradoensis</i> and <i>Savitreella phatthalungensis</i> in order to elucidate their phylogenetic relationships using a phylogenomic approach based on chromosome-level genome assemblies generated by long-read sequencing technologies. Our phylogenetic analyses suggest that <i>Saitoella</i> is distinct from all currently described classes within Taphrinomycotina, whereas <i>Savitreella</i> seems to belong to the class Taphrinomycetes. Furthermore, <i>Saitoella</i> shares high average amino acid identity with all other classes in Taphrinomycotina, suggesting that it retains ancient gene sequences. Our findings enable us to propose a new class, order, and family-namely, Saitoellomycetes, Saitoellales, and Saitoellaceae-automatically typified by the genus <i>Saitoella</i>. Our chromosome-level assembly reveals that <i>Saitoella coloradoensis</i> possesses 38 chromosomes, the highest number of chromosomes among fungi reported to date. We also identify structural differences between two <i>Saitoella</i> species and a chromosome structure lacking the canonical palindromic centromeric repeat sequence.</p>","PeriodicalId":18779,"journal":{"name":"Mycologia","volume":" ","pages":"284-301"},"PeriodicalIF":2.2,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146065139","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
MycologiaPub Date : 2026-03-01Epub Date: 2026-01-28DOI: 10.1080/00275514.2025.2592494
Wen-Xin Wang, Yi-Jia Sun, Xiao-Wei Chen, Xiao-Yu Shi, Ya-Ling Li, Ayaka Hieno, Koji Kageyama, Ming-Zhu Li, Hui-Qin Wang
{"title":"Two novel species, <i>Phytophthora umbellata</i>, sp. nov., and <i>Phytopythium niubeiliangense</i>, sp. nov., from a subtropical Island in Japan and a warm-temperate forest in China.","authors":"Wen-Xin Wang, Yi-Jia Sun, Xiao-Wei Chen, Xiao-Yu Shi, Ya-Ling Li, Ayaka Hieno, Koji Kageyama, Ming-Zhu Li, Hui-Qin Wang","doi":"10.1080/00275514.2025.2592494","DOIUrl":"10.1080/00275514.2025.2592494","url":null,"abstract":"<p><p>The Oomycetes are renowned for harboring several important pathogenic species, such as <i>Phytophthora</i> and <i>Pythium</i>. In this study, we described two species: a non-papillate, homothallic <i>Phytophthora</i> species and a papillate, asexual <i>Phytopythium</i> species. The strains were collected from the subtropical island of Japan and a warm-temperate forest in China, respectively. Neither strain could be fully assigned to any known taxon, so they were characterized through morphological studies and multigene phylogenetic analyses. The phylogenetic relationships were determined using four loci, namely, the internal transcribed spacer region (ITS-rDNA), cytochrome <i>c</i> oxidase gene (<i>cox1</i>), TigA gene fusion protein (<i>tigA</i>), and the ras-related protein (<i>ypt1</i>), for <i>Phytophthora</i> and five loci, namely, ITS-rDNA, 28S ribosomal DNA (28S-rDNA), <i>cox1, cox2</i>, and the beta-tubulin (<i>β-tub</i>) gene, for <i>Phytopythium</i>. Furthermore, the mitochondrial genome of the new <i>Phytophthora</i> species was sequenced and annotated, revealing a unique gene arrangement compared with related <i>Phytophthora</i> species. Based on these distinct morphological features and taxonomic status, we formally describe the two species as new species. Detailed micromorphological descriptions, illustrations, and molecular DNA data are provided to support their taxonomic classification.</p>","PeriodicalId":18779,"journal":{"name":"Mycologia","volume":" ","pages":"377-391"},"PeriodicalIF":2.2,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146065176","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
MycologiaPub Date : 2026-03-01Epub Date: 2026-01-21DOI: 10.1080/00275514.2025.2585771
Xinyu Wang, Min Ai, Lijuan Li, Fiona Ruth Worthy, Ting Zheng, Lun Wang, Yuxin Gan, Lulu Zhang, Lisong Wang
{"title":"Three new species of <i>Buellia</i> s.l. from the Qinghai-Tibetan Plateau represent a new lineage, the <i>pruinocalcarea</i>-group.","authors":"Xinyu Wang, Min Ai, Lijuan Li, Fiona Ruth Worthy, Ting Zheng, Lun Wang, Yuxin Gan, Lulu Zhang, Lisong Wang","doi":"10.1080/00275514.2025.2585771","DOIUrl":"10.1080/00275514.2025.2585771","url":null,"abstract":"<p><p>During scientific expeditions across the Qinghai-Tibetan Plateau, a group of <i>Buellia</i> species were frequently collected from alpine arid regions. These were characterized by having whitish chalky thalli, a surface covered with thick coarse pruina, a reddish-brown hypothecium, and the presence of xanthones. Detailed observations were made of specimen morphology and anatomy. Phylogenetic analysis was conducted based on four loci: the internal transcribed spacer of the rDNA (ITS), partial large subunit nuc rDNA region (28S), RNA polymerase II second largest subunit gene (<i>rpb2</i>), and β-tubulin gene (<i>tubb</i>). Three species, which formed a new distinct lineage within <i>Buellia</i> s.l. were confirmed as new to science: <i>Buellia plana, B. elevata</i>, and <i>B. tibetana</i>. This lineage is here referred to as the <i>pruinocalcarea</i>-group because of a species previously described that belongs to this group: <i>B. pruinocalcarea</i>. Species included in this group are closely related to <i>Tetramelas</i>; the group also has affinities to the <i>epigaea</i>-group and <i>subalbula</i>-group. Detailed descriptions, photographs of the new species, and a key to the species are provided.</p>","PeriodicalId":18779,"journal":{"name":"Mycologia","volume":" ","pages":"302-315"},"PeriodicalIF":2.2,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146018956","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Integrating morphology and phylogenetics reveals new species, records, and provides an updated checklist of Trichiaceae in China.","authors":"Wen-Long Song, Min-Li Cai, Shu-Zhen Yan, Shuang-Lin Chen","doi":"10.1080/00275514.2025.2603862","DOIUrl":"10.1080/00275514.2025.2603862","url":null,"abstract":"<p><p>The Trichiaceae, a major family of Myxomycetes, has undergone significant taxonomic revision in recent years. Yet, systematic research on this group in China remains limited, resulting in outdated taxonomy and persistent gaps in species diversity and biogeographic understanding. To resolve this, this study performed a comprehensive revision of Chinese Trichiaceae, combining morphological analysis (light and scanning electron microscopy) and multigene phylogenetics (nuclear 18S rDNA, elongation factor-1 alpha, and mitochondrial small subunit ribosomal RNA) based on specimens deposited in the Herbarium of Fungi at Nanjing Normal University and the Herbarium Mycologicum, Academiae Sinicae. We also synthesized published literature to compile an updated checklist of 65 species with detailed Chinese distribution records. This study describes two new species (<i>Metatrichia scintillans</i> and <i>Trichia coronata</i>), revises one species (<i>Oligonema latitubulare</i>), and reports four new records for China (<i>Ophiotheca calongei, Trichia acetocorticola, Trichia pinicola</i>, and <i>Trichia taeniifila</i>). This study addresses key knowledge gaps in China's myxomycete biota and provides a standardized framework for future research on Trichiaceae biodiversity and taxonomy.</p>","PeriodicalId":18779,"journal":{"name":"Mycologia","volume":" ","pages":"404-425"},"PeriodicalIF":2.2,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146181139","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
MycologiaPub Date : 2026-01-01Epub Date: 2025-12-04DOI: 10.1080/00275514.2025.2568230
Léini Vaessen, Katharina Russ, Martin Kirchmair, Sigrid Neuhauser, Birgit C Schlick-Steiner, Florian M Steiner
{"title":"How carton-nest fungi of the ant <i>Lasius fuliginosus</i> interact with each other and with the root-rot fungus <i>Armillaria mellea</i>.","authors":"Léini Vaessen, Katharina Russ, Martin Kirchmair, Sigrid Neuhauser, Birgit C Schlick-Steiner, Florian M Steiner","doi":"10.1080/00275514.2025.2568230","DOIUrl":"10.1080/00275514.2025.2568230","url":null,"abstract":"<p><p><i>Lasius fuliginosus</i>, a fungus-growing ant species distributed across Europe, hosts various fungi inside its carton nests in trees, including the nest fungus SP1 of the order Chaetothyriales, as well as the nest fungi SP5 and SP4 of the order Venturiales. The goal of this study was to gain a better understanding of the fungal interactions inside the <i>L. fuliginosus</i> nests as well as of potential interactions around the nests, including the effects of <i>Armillaria mellea</i>-a root-rot fungus infecting potential host trees. We performed two types of confrontation experiments on Petri dishes between the isolated nest fungi and <i>A. mellea</i>. Firstly, using de Wit experiments, we tested the fungal species in pairwise combinations at three different initial confrontation concentrations. Secondly, a linear confrontation setup focused on differences in directional growth of the fungal species in pairwise combinations as well as on the development of <i>A. mellea</i> rhizomorphs. For the fungi SP1, SP5, and SP4, we found positive influences on each other (SP1 on SP5, SP4 on SP1 and SP5, and SP5 on SP1) alongside no influence (SP1 on SP4, SP5 on SP4). SP1 had a significantly negative impact on the surface growth and directional growth of <i>A. mellea</i>, and SP5 triggered the strongest rhizomorph development of <i>A. mellea</i>, possibly a stress reaction of the root-rot fungus. <i>Armillaria mellea</i> did not negatively impact any of the nest fungi and even promoted the surface growth of SP1. The de Wit setup and the linear setup turned out to be complementary and together facilitated first insights into potential roles of the nest fungi in this association of ants and fungi in trees. Follow-up studies will need to assess how these findings under Petri dish conditions transfer to conditions in natural habitat, in the presence of both the ant and the tree host.</p>","PeriodicalId":18779,"journal":{"name":"Mycologia","volume":" ","pages":"1-9"},"PeriodicalIF":2.6,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145669053","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}