Bryum bicolor
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Bryum bicolor |
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Bryum bicolor is a dioecious , inconspicuous, but relatively common moss. It is also called "Zweifarbiges Birnmoos" in German, although it shares this name with Bryum barnesii .
Occurrence
Bryum bicolor is a poorly competitive pioneer moss that occurs in many locations and can quickly repopulate them. It prefers light-rich, fresh to moist, base-rich, calcareous, open locations with sandy-loamy or clay soils. It settles ruderal areas, earthfills, on embankments, in garden beds, on stubble fields, in flower pots, in gravel and clay pits, open-ground areas on meadows, pastures, dry grass and in the joints of walls. It often grows together with Bryum argenteum , Bryum barnesii , Bryum rubens , Barbula unguiculata , Barbula convoluta , Didymodon fallax and Phascum cuspidatum . It is widespread in Europe. In the north it penetrates to Scandinavia and Iceland, in the south to parts of Africa, in the east to Russia. Its natural occurrence is probably along river banks and in often flooded river valleys.
Identifying features
Bryum bicolor grows in loose to dense 1.5 cm high lawns. It forms yellowish brown rhizoids. Its hollow leaves are dry, but stick up when wet. They are ovate and lanceolate in shape and gradually taper into a longer point. The leaf vein usually ends in the leaf tip and rarely emerges. The lamina cells are elongated hexagonal in the middle of the leaf, 10 to 18 µm wide and 40 to 80 µm long. The edge of the leaf is designed as a border of 2 to 3 rows of elongated hexagonal cells. At the tip of the trunks, the moss forms egg-shaped brood bodies that are 200 to 480 µm long. The leaf primordia of the brood bodies are only in the upper half. The reddish colored seta becomes 1.5 cm long and carries red colored, hanging egg-shaped capsules that are suddenly narrowed into the seta. There is a risk of confusion with the very similar Bryum barnesii , which, however, develops several instead of only 1 to 2 pairs of brood bodies in the leaf axils.
literature
- Martin Nebel, Georg Philippi (ed.): The mosses of Baden-Württemberg. Volume 2: Special part, (Bryophytina II, Schistostegales to Hypnobryales). Ulmer, Stuttgart 2001, ISBN 3-8001-3530-2 .
- Jan-Peter Frahm , Wolfgang Frey : Moosflora (= UTB . 1250). 4th, revised and expanded edition. Ulmer, Stuttgart 2004, ISBN 3-8252-1250-5 .
Web links
Bryum bicolor dicks. In: Moose-Deutschlands, Central Office Germany. Retrieved October 21, 2019