Sumana Mahato, Maria Virginia Bianchinotti, Sampa Kundu, Mahasin Ali Khan
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引用次数: 0
摘要
在喜马拉雅山脉东部大吉岭山麓的下西瓦利克(Chunabati Formation;中新世中期)沉积地层中发现的肉桂属(Lauraceae)植物的叶片角质层上有保存完好的丝孢子菌残骸。根据其特征(单生的泡状分生孢子器直接从表层菌丝中产生,强烈弯曲、深色色素、卵圆形到梨形的泡状体,带有 1-3 个细胞的柄细胞),本文提出了一个新的化石物种 Zygosporium palaeogibbum sp.宿主叶片角质层上数量可观的 Z. palaeogibbum 的原位证据表明,在大吉岭次喜马拉雅古代温暖湿润的热带气候条件下,可能存在着宿主特异性的吸食关系。这一关于过去气候的结论与通过研究同一化石地点的巨型植物遗骸获得的已发表的定性、定量和古植物学气候数据一致。
Zygosporium palaeogibbum sp. nov. (Xylariales, Ascomycota) associated with Cinnamomum Schaeff. (Lauraceae) leaves from the Siwalik (Middle Miocene) of eastern Himalaya
Well-preserved remains of a mitosporic fungus were found on leaf cuticles of Cinnamomum sp. (Lauraceae) recovered from the lower Siwalik (Chunabati Formation; Middle Miocene) sedimentary stratum of Darjeeling foothills of eastern Himalaya. Based on the characteristic features (solitary vesicular conidiophores arising directly from a superficial mycelium and strongly curved, darkly pigmented, ovoid to pyriform vesicles with 1–3 celled stalk cells), it is here proposed as a new fossil species, Zygosporium palaeogibbum sp. nov. The in situ evidence of Z. palaeogibbum in appreciable numbers on the host leaf cuticles suggests the probable existence of a host-specific saprophytic relationship in the Darjeeling sub-Himalaya’s ancient warm humid tropical climate during the time of deposition. This conclusion on past climate is in agreement with published qualitative, quantitative, and palaeomycological climatic data obtained from the study of megafossil plant remains from the same fossil locality.