Pseudocrossidium
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Pseudocrossidium (German Scheinfransenmoose ) is a genus of deciduous moss from the family Pottiaceae .
features
The species form dense to loose, low, yellow-green to brownish-green above, brown to red-brown inside, or cushions with upright, simple or branched individual plants up to 2 centimeters in size. The trunks usually have a central cord. The egg-shaped or tongue-shaped to lanceolate, sharply pointed, blunt or rounded leaves are dry, lying and often twisted, moist upright to protruding. The entire or slightly serrated leaf margins are strongly rolled back or bent back. The strong leaf vein, which mostly emerges as a tip, has short papillary cells on the upper side (ventral) and elongated cells on the lower side (dorsal). A well-developed dorsal stereid group can be seen in the cross-section of the leaf vein; ventral stereids are absent or only a few are present. The leaf cells are round at the top, square and mostly densely papillary, at the leaf base they are rectangular and smooth.
Pseudocrossidium species are dioecious . The upright seta is 1 to 2 centimeters long, the spore capsule elliptical to cylindrical, sometimes curved. The 16 or 32 peristome teeth are thread-like and often spirally wound. The capsule lid is conical and often beaked, the kalyptra is hooded. Spores are 8 to 12 micrometers in size.
distribution
The genus is represented in Europe, West Asia, Africa, in North to South America and in Australia.
Systematics and types
Pseudocrossidium (like the genus Didymodon, for example ) was often part of the genus Barbula . According to Frey / Fischer / Stech, it is treated here as an independent genus. It includes 16 species worldwide. The following three types occur in Germany, Austria and Switzerland:
literature
- Wolfgang Frey , Michael Stech, Eberhard Fischer: Bryophytes and Seedless Vascular Plants (= Syllabus of Plant Families. 3). 13th edition. Borntraeger, Berlin et al. 2009, ISBN 978-3-443-01063-8 .
- Martin Nebel, Georg Philippi (ed.): The mosses of Baden-Württemberg. Volume 1: General part, special part (Bryophytina I, Andreaeales to Funariales). Ulmer, Stuttgart 2000, ISBN 3-8001-3527-2 .
