Stereocaulon tomentosoides,一种北美西部特有物种的新组合,具有蓝藻菌丝和化学型多态性

Q2 Agricultural and Biological Sciences
Bruce McCune, Lucie Vančurová, Leena Myllys
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引用次数: 0

摘要

基于对模式标本产地及周边地区的重新取样,以及对分子数据的系统发育分析,我们将Stereocaulon sasakii var.S. sasakii 的任何变种出现在北美,因此我们建议将该种从北美名录中删除,并将其北美变种归入 S. tomentosoides。迄今为止,Stereocaulon tomentosoides 只被证实产于北美洲的西北太平洋地区。此外,除了爱达荷州北部和蒙大拿州西部的一小片重叠区域外,它与 S. tomentosum 大体上是同域植物。S. tomentosoides 的不同之处在于,它的主要化学类型是萝蔔酸,但同时含有萝蔔酸和石杉酸的化学类型并不多见。S.tomentosoides的头状花序中通常含有Nostoc,但偶尔也会含有Stigonema,尤其是来自古老的长满苔藓的熔岩流中的个体;在一个标本中发现了两种头状花序。对这些物种和其他近亲进行系统发育分析后,发现了这里描述的另一个物种--S. cyaneum,到目前为止,人们只知道它产于美国和加拿大的大湖区。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Stereocaulon tomentosoides, a new combination for a western North American endemic species with cyanobiont and chemotype polymorphisms
Based on resampling the type locality and surrounding regions, along with phylogenetic analysis of molecular data, we elevate Stereocaulon sasakii var. tomentosoides to the species level, while we treat S. sasakii var. simplex as an environmental modification of S. tomentosoides. We found no phylogenetic evidence that any variety of S. sasakii occurs in North America, so we suggest that the species be removed from the North American list and its North American varieties transferred to S. tomentosoides. Stereocaulon tomentosoides is so far confirmed only from the Pacific Northwest of North America. Furthermore, it is largely allopatric with S. tomentosum, apart from a small region of overlap in northern Idaho and western Montana. While S. tomentosum always contains stictic acid and never lobaric acid as secondary metabolites, S. tomentosoides differs in having a predominant chemotype of lobaric acid as the major substance, with an infrequent chemotype containing both lobaric and stictic acids. While S. tomentosoides usually contains Nostoc in the cephalodia, occasional individuals, especially from old mossy lava flows, contain Stigonema; one specimen was found with both kinds of cephalodia on a single thallus. Phylogenetic analysis of these species and other close relatives revealed an additional species described here, S. cyaneum, so far known only from the Great Lakes region of the United States and Canada and separated from S. tomentosum by its bluish coloration, wet or dry
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来源期刊
Plant and Fungal Systematics
Plant and Fungal Systematics Agricultural and Biological Sciences-Plant Science
CiteScore
2.40
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0.00%
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2
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