Schistidium
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Schistidium apocarpum s. st. |
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Schistidium (German Spalthütchen or Spalthütchenmoose ) is a genus of deciduous mosses from the family Grimmiaceae .
features
Schistidium species form cushion-shaped lawns. The individual, upright to prostrate plants are more or less strongly branched, have ovate to lanceolate, blunt to pointed leaves with a distinct rib that extends to the tip of the leaf or protrudes briefly. Often there is a glass tip. The leaf margins are flat or rolled back. The lamina cells are usually square at the top and elongated around the lower part of the leaf. They can be smooth to papilose. The upper leaf area and especially the leaf margins are often multilayered. The almost always numerous spore capsules on the mostly quite short seta are more or less sunk into the perichaetial leaves, have 16 peristomal teeth , a broadly conical and short beaked lid and a small, cap-shaped or cap-shaped calyptra .
Systematics and types
The species delimitation in the genus Schistidium was and is difficult and controversial. For one part, the Schistidium apocarpum complex, HHBlom submitted a revision for Norway and Sweden in 1996, in which it is divided into a number of (small) species.
In the system presented by Frey, Fischer & Stech, around 110 species are distinguished worldwide. Around 32 species are represented in Germany, Austria and Switzerland, including the following (selection):
- Schistidium apocarpum in the narrower sense
- Schistidium atrofuscum
- Schistidium brunnescens
- Schistidium crassipilum
- Schistidium dupretii
- Schistidium elegantulum
- Schistidium helveticum
- Schistidium papillosum
- Schistidium pruinosum
- Schistidium rivulare
- Schistidium robustum
- Schistidium singarense
- Schistidium trichodon
literature
- Jan-Peter Frahm , Wolfgang Frey : Moosflora (= UTB . 1250). 4th, revised and expanded edition. Ulmer, Stuttgart 2004, ISBN 3-8252-1250-5 .
- 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 .
