Department of Biological Sciences, The University of Alberta, Edmonton, Alberta, Canada T6G 2E9.
Am J Bot. 1998 Sep;85(9):1324-37.
The affinities as well as the circumscription of the Orthotrichaceae (Bryopsida), one of the most diverse families of mosses, have been the focus of a controversy for much of the last century. We obtained rbcL sequences for 37 arthrodontous mosses, including 27 taxa of the Orthotrichales. The sequences were analyzed using maximum parsimony and neighbor joining in order to (1) test the monophyly of the Orthotrichales and the Orthotrichaceae; (2) determine their phylogenetic relationships; and (3) test the current subfamilial classification within the Orthotrichaceae. Both analyses suggest that the Orthotrichales are polyphyletic. The Erpodiaceae and the Rhachitheciaceae as well as Amphidium and Drummondia, two genera of the Orthotrichaceae, are shown to be of haplolepideous affinity. The Splachnales, the Bryales sensu lato, and the Orthotrichales form a monophyletic clade sister to the Haplolepideae. Both neighbor joining and maximum parsimony also suggest that the Orthotrichaceae are composed of two major lineages dominated either by acrocarpous or cladocarpous taxa. The monophyly of the family is, however, only well supported by Tamura's distances. The genera Macrocoma, Macromitrium, Orthotrichum, Ulota, and Zygodon all appear to be artificial assemblages. This study illustrates the contribution of rbcL sequence data to bryophyte systematics and, particularly, in determining the affinities of taxa lacking a peristome, whose characters are central to the classification of mosses.
Orthotrichaceae（苔藓植物门金发藓纲）是苔藓植物中最多样化的科之一，其亲缘关系和范围一直是上个世纪以来争论的焦点。我们获得了 37 种 Arthrodontous 苔藓植物的 rbcL 序列，包括 Orthotrichales 的 27 个分类群。为了（1）检验 Orthotrichales 和 Orthotrichaceae 的单系性；（2）确定它们的系统发育关系；（3）检验 Orthotrichaceae 中当前的亚科分类，我们使用最大简约法和邻接法对序列进行了分析。这两种分析都表明 Orthotrichales 是多系的。Erpodiaceae 和 Rhachitheciaceae 以及 Orthotrichaceae 中的 Amphidium 和 Drummondia 被证明具有 haplolepideous 亲缘关系。Splachnales、Bryales sensu lato 和 Orthotrichales 形成一个单系分支，与 Haplolepideae 为姐妹群。邻接法和最大简约法也表明 Orthotrichaceae 由两个主要的谱系组成，分别由 acrocarpous 或 cladocarpous 分类群主导。然而，只有 Tamura 的距离才能很好地支持该科的单系性。Macrocoma、Macromitrium、Orthotrichum、Ulota 和 Zygodon 等属似乎都是人为的组合。本研究说明了 rbcL 序列数据对苔藓植物系统学的贡献，特别是在确定缺乏拟叶的分类群的亲缘关系方面，这些分类群的特征是苔藓植物分类的核心。
