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Issue: Vol. 47 No. 1: 22 May 2024
Type: Article
Published: 2024-05-22
DOI: 10.11646/bde.47.1.7
Page range: 31-50
Abstract views: 110
PDF downloaded: 15

Homoplasy rather than intergeneric hybridisation explains mammillose leaf cells in Schistidium mammillosum sp. nov. (Grimmiaceae)

Department of Botany; Stuttgart State Museum of Natural History; Rosenstein 1; 70191 Stuttgart; Germany; Department of Systematic and Evolutionary Botany; University of Zurich UZH; Zollikerstrasse 107; 8008 Zürich; Switzerland
Hardturmstrasse 269/6 8005 Zurich; Switzerland
1 Crookstile Cottages; Farley Hill; Matlock; Derbyshire; DE4 3LL; Great Britain
Norwegian Institute of Bioeconomy Research; Thormøhlensgate 55; 5006 Bergen; Norway
Alps Bryophytes Convergence Grimmia Mosses Taxonomy

Abstract

We present a peculiar new species in the Grimmiaceae, Schistidium mammillosum, which is distinct in having mammillose leaf cells and pluristratose lamina. These features are rare in mosses but shared by a few Grimmia species including sympatric G. alpestris. Sporophyte characteristics of the new taxon, in contrast, indicated a species of Schistidium and suggested a possible intergeneric hybrid origin. Nuclear ITS and plastid rps4‒trnF sequence data consistently resolved the new taxon within species of Schistidium, thus contradicting the hybridogenic hypothesis. We suggest that the shared feature of mammillose cells evolved independently in the two genera in adaptation to similar environmental conditions, possibly prolonged snow cover. Supported by morphological similarity, our phylogenetic analyses indicate a sister relationship of S. mammillosum and S. marginale in the Confertum clade. Schistidium mammillosum colonises siliceous rocks in the alpine and nival zone and is to date known from the French Alps and a single locality in Switzerland.

 

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