Leucobryaceae
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The Leucobryaceae are a family of mosses from the order Dicranales . The well-known and common white moss ( Leucobryum glaucum ) belongs to this moss family.
features
The mosses form lawns or cushions. The leaves are linear-lanceolate to tongue-shaped.
The family is morphologically diverse, but well defined by molecular data. Morphologically , a distinction is made between dicranoid and leucobryoid genera. What they all have in common is a broad leaf vein, which takes up at least a third of the leaf width. In the dicranoid genera, the cross-section of the rib shows a median layer of deuter cells and on both sides of them extensive hyalocytes and / or stereids (narrow-lumen and thick-walled cells). In leucobryoid genera, the rib cross section consists of two or more layers of large hyalocytes and a middle layer of small cells containing chlorophyll.
The lamina cells are smooth and variable in shape. Leaf-wing cells are more or less differentiated only in dicranoid genera.
The species are usually diocesan . The seta is usually elongated, straight or curved, the spore capsule egg-shaped to cylindrical, the lid beaked, the hood (kalyptra) cap-shaped. In addition to sexual reproduction, there is also asexual reproduction through brood leaves, branches or brood bodies.
distribution
The species of the family are common in the northern and southern hemispheres, but mainly in tropical areas. Mostly they are soil dwellers or epiphytes .
Systematics
The genera that are now part of the genus Leucobryaceae were at least partially assigned to the Dicranaceae in the past . According to the Frey / Fischer / Stech system, the family includes 14 genera worldwide with around 300 species:
- Atractylocarpus , 4 species, dicranoid
- Brothera , 1 species ( Brothera leana ), dicranoid
- Campylopus , approx. 150 species, dicranoid
- Cladopodanthus , 3 species, leucobryoid
- Dicranodontium , 15 species, dicranoid
- Holomitriopsis , 1 species ( Holomitriopsis laevifolia ), leucobryoid
- Leucobryum , 83 species, leucobryoid
- Metzleria , 9 species, dicranoid
- Mitrobryum , 1 species ( Mitrobryum koelzii ), dicranoid
- Ochrobryum , 18 species, leucobryoid
- Pilopogon , 8 species, dicranoid
- Schistomitrium , 5 species, leucobryoid
- Sphaerothecium , 3 species, dicranoid
- Steyermarkiella , 1 species ( Steyermarkiella anomalodictya ), leucobryoid
4 genera are represented in Europe: Atractylocarpus (in the Alps, very rare), Campylopus , Dicranodontium and Leucobryum .
swell
- Wolfgang Frey , Michael Stech, Eberhard Fischer: Bryophytes and Seedless Vascular Plants (= Syllabus of Plant Families. 3). 13th edition. Borntraeger, Berlin et al. 2009, ISBN 978-3-443-01063-8 , pp. 170 ff.
