Grimmia donniana
| Grimmia donniana | ||||||||||||
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Grimmia donniana |
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| Scientific name | ||||||||||||
| Grimmia donniana | ||||||||||||
| ( Sm. , 1804) |
Grimmia donniana (German stump cover pillow moss ) is a deciduous moss - species from the family Grimmiaceae .
features
Grimmia donniana usually forms smaller, rounded, dense, up to 1.5 centimeters high, dark green cushions that shimmer gray through the glass tips. The lower stem leaves are small, the upper ones larger and upright. They are broadly lanceolate to narrowly lanceolate, gradually narrowing to the tip and keeled at the top in a V-shape. The smooth to weakly serrated, hyaline spike tip reaches about half the length of the lamina on the upper leaves, it is shorter or absent on the lower leaves. The leaf margins are flat and double or triple-layered at the top in several rows. The lower part of the leaf is consistently single-celled. The cells are elongated at the bottom and rectangular and at the edge usually in several rows hyaline, at the top irregularly round-square with bulging, thickened cell walls.
The spore capsule on the 3 millimeter long and mostly upright seta is oval, smooth, upright and up to 1.5 millimeters long, the lid is short, conical with a small point, the hood ( kalyptra ) shaped like a cap. The species is autocratic ( antheridia and archegonia on different branches on the same plant). Spore capsules are quite common, spore ripening time is from spring to autumn.
Several infraspecific clans with controversial taxonomic value are distinguished within the variety of forms.
Location claims and distribution
Grimmia donniana grows in mountainous areas on silicate rock in moderately dry to fresh, often partially shaded locations. The species often settles on old dry stone walls or isolated boulders.
In Germany, Austria and Switzerland, the species is mainly found in the Alps, where it is moderately common in the Central Alps. In Germany, apart from the Alps, it occurs almost only in the low mountain ranges, is absent in the lowlands apart from a few locations and is generally rare. There are non-European occurrences in parts of Asia, in North and South America, in North, East and South Africa and in the Antarctic.
Sources and further information
- 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 .
