Didymodon rigidulus
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Didymodon rigidulus ( Rigid double toothed Moss ) is a moss -Art from the family pottiaceae . A common synonym is Barbula rigidula (Hedw.) Mitt.
features
The moss forms brownish green to dirty green or dark green, denser cushioned lawns. The little branched stems are about 1 to 2 centimeters tall and have a central strand in cross section. With a broad base, the leaves are gradually long and bluntly pointed, with entire margins, not keeled, with a strong rib reaching to the tip of the leaf. When damp, the leaves are upright or protruding, and when dry, they are bent. The leaf margins are bent back, towards the leaf tip mostly flat and two-celled. The leaf cells are round, square, thick-walled and slightly papilose in the upper part of the leaf, rectangular, thin-walled and smooth on the leaf base. The top of the rib has short cells.
The diocesan kind is moderately fruitful. The red seta is up to 1.5 centimeters long, the elongated ovoid to cylindrical, upright capsule has short, more or less upright peristome teeth , the lid is long beaked, the spores are smooth and 8 to 16 µm in size. Usually multicellular, spherical brood bodies are present in the upper leaf axils .
Didymodon rigidulus is a multifaceted species, several varieties are distinguished.
Distribution and location requirements
Didymodon rigidulus is mainly found in the temperate climate zones and occurs in parts of Asia, in North and Central America, in northern and tropical Africa and in Antarctica. In Central Europe, the moss can be found from the plains to the high mountains, is widespread and quite common, especially in the limestone regions. It grows in fresh to moist, also in dry-warm, partially shaded to light-rich locations on base-rich, mostly calcareous rock, more rarely on calcareous soil or loess, often also on secondary locations such as walls, concrete or roof tiles.
literature
- Jan-Peter Frahm , Wolfgang Frey : Moosflora (= UTB . 1250). 4th, revised and expanded edition. Ulmer, Stuttgart 2004, ISBN 3-8252-1250-5 .
- 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 .
