Bryum barnesii
| Bryum barnesii | ||||||||||||
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Two-tone pear moss ( Bryum barnesii ) |
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Bryum barnesii | ||||||||||||
| JBWood |
Bryum barnesii is a variable, diocesan moss that rarely forms sporogons . It is also called "Zweifarbiges Birnmoos" in German, although it shares this name with Bryum bicolor .
Occurrence
It is a poorly competitive pioneer moss that can colonize new locations quickly. It occurs on open, base-rich, often calcareous, low-humus, loamy-clayey, sandy-loamy, or gravelly soil in bright, fresh to moist locations. It prefers to colonize gravel and clay pits, quarries, rudderal roadsides and roadsides, can be found on embankments, in pavement joints, gaps in meadows, pastures and fallow fields, in garden beds and especially on flooded river banks and in river valleys. It often grows together with Bryum argenteum , Bryum bicolor , Bryum rubens , Brabula unguiculata , Barbula convoluta , Dicranella varia , Didymodon fallax and Phascum cuspidatum . It is probably spread all over Europe. However, its distribution is only insufficiently known, since it has only recently been discovered by Bryum bicolor s. st. has been severed as a separate species.
Identifying features
Bryum barnesii forms yellowish green to olive green colored, up to 1.5 cm high plants that grow in small, loose lawns or herds. Its rhizoids are reddish brown in color. The hollow leaves are dry, but stick out upright when moist. They are ovate and lanceolate, mostly blunt and pointed, less often long pointed. The leaf margins are usually slightly bent. The leaf vein is well developed, ends in the leaf tip and rarely emerges briefly. The lamina cells are 10 to 15 µm wide and 40 to 80 µm long in the middle of the leaf. At the leaf margins they are much narrower and form a weak border of 2 to 3 cell kingdoms. At the tip of the stems it forms numerous, obovate brood bodies, which are always several (up to 15) in the leaf axils. These are between 200 µm and 500 µm long and the leaf primordia only start in the upper third. The seta is up to 1.5 cm long and has a brownish-colored, hanging capsule that is egg-shaped and suddenly runs into the seta. There is a risk of confusion with Bryum bicolor . But the abundant brood bodies make them easy to distinguish.
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 barnesii JBWood In: Moose Germany, Central Office Germany. Retrieved October 21, 2019
