Pear-shaped bubble cap moss
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Pear-shaped bladder cap moss ( Physcomitrium pyriforme ) |
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| Physcomitrium pyriforme | ||||||||||||
| ( Hedw. ) Brid. |
The pear-shaped bubble cap moss ( Physcomitrium pyriforme ) is a scattered, inconsistent, short-lived pioneer moss that grows in small groups or individually. The antheridia and archegonia are on different branches on the same plant (autocial).
Identifying features
The moss forms up to 1 cm high plants that are pale green to yellowish green in color. The lower leaves are small, the upper ones increasingly larger and clustered like a rosette. They stand upright to bulky, are obovate to ovate, lanceolate and sharply pointed. The leaf margins are conspicuously serrated in the upper part. The rib ends below or in the tip of the leaf. The rhombic to rectangular lamina cells are loosely arranged, thin-walled and 20 to 50 µm wide. At the leaf margin it often forms an indistinct border of longer and narrower cells. In addition, there are often clearly differentiated groups of cells near the base of the leaf that are translucent ( hyaline ), water-white and can be seen with a magnifying glass. The upright seta becomes up to 14 mm long. It carries upright capsules that are spherical to inverted pear-shaped. Your capsule neck is short and thick. There is no peristome. The capsule lid has a short beak. The kalyptra , which is deeply divided into several lobes in the lower part, is cap-shaped and has a strikingly long beak. The papillary spores are 25 to 45 µm in diameter. Spores ripen in spring to early summer.
Occurrence
The pear-shaped bladder cap moss colonizes light-rich, open, moist to wet, base-rich, often calcareous, alkaline to slightly acidic, nutrient-rich, sometimes disturbed locations. It grows on loamy, clay or humus soil. Fallow fields, patchy meadows and pastures, ditches, disturbed ruderal areas, fresh soil deposits, banks of bodies of water, open-ground areas in alluvial forests and peat cut-outs are typical places. The moss has also been observed more frequently in garden beds, in greenhouses and in flower pots.
literature
- 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 .
- Jan-Peter Frahm , Wolfgang Frey : Moosflora (= UTB . 1250). 4th, revised and expanded edition. Ulmer, Stuttgart 2004, ISBN 3-8252-1250-5 .
