Wynns Justin T, Munk Karen Rysbjerg, Lange Conny B Asmussen
Natural History Museum of Denmark, Øster Farimagsgade 2D, opg. E, 3, DK-1353, Copenhagen, Denmark.
Section for Organismal Biology, Department of Plant and Environmental Sciences, Faculty of Science, University of Copenhagen, Thorvaldsensvej 40, DK-1871, Frederiksberg, Denmark.
Cladistics. 2018 Oct;34(5):469-501. doi: 10.1111/cla.12210. Epub 2017 Oct 11.
We investigated the systematic relationships within the pleurocarpous moss genus Plagiothecium, based on cladistic analyses of sequence data from one nuclear (ITS) and two plastid (trnK-psbA (matK) and rpl16 intron) DNA regions for 110 specimens of Plagiothecium and similar hypnalean mosses. Plastid and nuclear trees were mostly similar, but differed in the placement of several species of Plagiothecium, and in the relationships among other genera. The phylogenetic hypotheses based on plastid markers were well resolved; in contrast, nuclear data were insufficient to resolve some of the lowest-level relationships within the genus. In the main Plagiothecium is natural, includes more taxa than are often recognized, and is most closely related to Isopterygiopsis and Herzogiella. Nine sections are recognized within Plagiothecium, four new: Section Pseudo-Neckera to accommodate P. neckeroideum and its allies, Section Ortholimnobium for P. handelii and P. paleaceum, Section Struckia for P. argentatum and P. enerve, and Section Rectithecium for P. piliferum. The geographical distribution of the sections suggests that Plagiothecium originated in Asia. The derived, mainly autoicous sections Plagiothecium and Leptophyllum may have spread to the Southern Hemisphere through long distance dispersal. Three new species in section Leptophyllum (P. funale, P. pacificum and P. rhizolucidum) and two new taxa in section Pseudo-Neckera (P. decoratum and P. neckeroideum fo. exile) are described. A limited phylogenetic hypothesis for the superficially similar hypnalean genus Taxiphyllum, which was used as outgroup, is included. A related genus (Longiella) is described, with a single species (L. plagiothecioides). The aquarium species T. barbieri is transferred to Ectropothecium.
我们基于对110个斜蒴藓属及类似的Hypnalean藓类标本的一个核DNA区域（ITS）和两个质体DNA区域（trnK - psbA（matK）和rpl16内含子）的序列数据进行分支分析，研究了斜蒴藓属侧蒴藓类植物的系统发育关系。质体树和核树大多相似，但在几个斜蒴藓属物种的位置以及其他属之间的关系上存在差异。基于质体标记的系统发育假设得到了很好的解析；相比之下，核数据不足以解析该属内一些最低级别的关系。总体而言，斜蒴藓属是自然的，包含的分类群比通常认可的更多，并且与拟异枝藓属和 Herzogiella 关系最为密切。在斜蒴藓属内识别出九个组，其中四个是新组：容纳拟直蒴藓及其近缘种的拟直蒴藓组；包含韩氏斜蒴藓和淡色斜蒴藓的直沼藓组；有银色斜蒴藓和柔弱斜蒴藓的斯特鲁克藓组；以及具毛斜蒴藓的直蒴藓组。这些组的地理分布表明斜蒴藓属起源于亚洲。衍生的、主要为雌雄异株的斜蒴藓组和薄叶藓组可能通过远距离扩散传播到了南半球。描述了薄叶藓组中的三个新物种（细枝斜蒴藓、太平洋斜蒴藓和具根透明斜蒴藓）以及拟直蒴藓组中的两个新分类群（美丽斜蒴藓和拟直蒴藓瘦小叶变型）。还包括了作为外类群的表面相似的Hypnalean属羽枝藓属的有限系统发育假设。描述了一个相关属（长蒴藓属），其只有一个物种（长蒴藓属斜蒴藓类）。水族箱物种巴氏羽枝藓被转移到异蒴藓属。
