Rhodobryum ontariense
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Rhodobryum ontariense (German rock rose moss ) is a deciduous moss species from the Bryaceae family .
features
The plants are usually 2 to 3 centimeters high and grow in loose to dense lawns. The leaf rosette at the tips of the stem consists of 18 to 52 (at least 15, maximum 60) leaves that are almost spherical. The spatulate, egg-shaped or elliptical leaves are up to 5 or 6 millimeters long and narrowed into a short, wide tip. The leaf vein ends in the leaf tip or emerges as a short spike tip. The leaf margins are broadly rolled back at the bottom and sawn in the upper part. The lamina cells are rhomboid to elongated rhomboid or (elongated) hexagonal. The upper flat leaf margin has one or two rows with narrow, elongated cells that form a distinct border.
The reddish seta is up to about 3.5 millimeters long, upright and briefly arched at the top, the spore capsule cylindrical and slightly curved, hanging or inclined, is almost horizontal. The spore ripening time is in the winter half year. However, sporophytes are not common.
Systematics
The species was originally described in 1889 by Kindberg from North America, where it occurs frequently, but later only considered a synonym for Rhodobryum roseum . Rhodobryum ontariense was only "rediscovered" as an independent species by Iwatsuki and Koponen in 1972. Both species are widespread in Europe, but were therefore not distinguished until later.
Distinction
Rhodobryum ontariense differs from the very similar second species Rhodobryum roseum, which occurs in Europe, above all in the more spherical leaf rosette, which is usually composed of more numerous leaves, and the leaf veins that emerge or end in the leaf tip. The cross-section of the leaf vein shows, below the middle, a group with numerous small-cell stereids , separated from the dorsal edge of the rib by only a row of cells ; Rhodobryum roseum has fewer stereids, which are separated from the dorsal border by two to three rows of cells.
Location claims and distribution
The moss grows in shady to bright, fresh to dry locations in forests, in bushes or in dry grass. It often colonizes limestone rocks and limestone blocks with a thin layer of soil, and it also grows on limestone gravel, sand or skeletal soil.
Since the species has only been differentiated for a few decades, the distribution is currently only incompletely known. In Central Europe it is widespread, in the Alps it occurs up to the subalpine altitude. There are other occurrences in parts of Asia and in North and Central America.
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 2: Special part, (Bryophytina II, Schistostegales to Hypnobryales). Ulmer, Stuttgart 2001, ISBN 3-8001-3530-2 .
