ABSTRACT Introduction. While revising material of South American Syntrichia for a worldwide revision of the genus, one specimen collected in Aysén (Chile) did not match the concept of any of the species known in the genus. Here we present our argument for recognising this moss as a new species and its differentiation from other closely related taxa. Methods. About 3500 specimens from South America belonging to this genus were studied with the typical anatomical and morphological methods. In addition, most of the type material of the taxa attributed to this genus in the world has been studied. Photographic images of key features of the species were obtained for the preparation of illustrations for publication. Results and conclusions. A new moss species, Syntrichia lamellaris M.T.Gallego, M.J.Cano & Larraín, is described and illustrated from Chilean Patagonia. The species is corticolous and distinguished morphologically by its stems with irregular hyalodermis, oblanceolate to obovate-lingulate leaves that are extremely fragile, with apices ending in a spinulose red mucro, plane and strongly sinuous to lacerated leaf margins, and dorsal costal surface without stereids in the upper third, but with irregularly lobed dorsal lamellae. Possible confusion with other closely related taxa is discussed.

中文翻译：

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Syntrichia lamellaris MTGallego, MJCano & Larraín (Pottiaceae)，一种来自智利巴塔哥尼亚的新苔藓物种

摘要介绍。在修订南美 Syntrichia 的材料以对该属进行全球修订时，在 Aysén（智利）收集的一个标本与该属中任何已知物种的概念都不匹配。在这里，我们提出了将这种苔藓识别为新物种及其与其他密切相关分类群的区别的论点。方法。用典型的解剖学和形态学方法研究了来自该属的约 3500 个南美洲标本。此外，世界上大多数归属于该属的分类群的类型材料已被研究。获得了该物种主要特征的摄影图像，用于准备出版插图。结果和结论。一种新的苔藓物种 Syntrichia lamellaris MTGallego、MJCano 和 Larraín，来自智利巴塔哥尼亚的描述和插图。该物种是皮质的，在形态学上的区别在于它的茎有不规则的透明皮，倒披针形到倒卵形的小舌状叶非常脆弱，顶端末端为带刺的红色小尖刺，平面和强烈弯曲到裂开的叶缘，背肋面没有大叶。上三分之一，但有不规则裂的背板。讨论了与其他密切相关的分类群的可能混淆。但具有不规则裂的背板。讨论了与其他密切相关的分类群的可能混淆。但具有不规则裂的背板。讨论了与其他密切相关的分类群的可能混淆。