Crossidium Jur.

Crossidium moss (en)

Genus

Bryophytes > Pottiales > Pottiaceae

Characteristics

Plants in thin turfs or small cushions. Stem 1-10 mm, central strand present. Leaves evenly distributed or crowded, imbricate to slightly twisted when dry, lingulate, lanceolate to deltoid, 0.5-2.0 mm, 1-stratose, concave in distal half, base rectangular to ovate, margins entire, plane to recurved, apex obtuse, rounded or emarginate; costa excurrent as a whitish hair, in section hydroids present between the stereid and the guide cells, stereid band abaxial, filaments restricted to adaxial surface of costa, filament cells cylindric to subspheric, usually thin-walled, terminal cell cylindric to conic to subspheric, generally thin-walled, often papillose; cells of leaf base rectangular, firm-walled; medial and distal leaf cells quadrate to rectangular, firm-walled, sometimes thick-walled, smooth or with 1 to 8 papillae on either surface. Sexual condition dioicous or monoicous; perigonia budlike, leaves short and broad; perichaetia little or not differentiated. Seta 5-20 mm. Capsule cylindric to ovoid-cylindric, erect; annulus of 1-2 rows of vesiculose cells; operculum conic to rostrate, erect or inclined; peristome short and cribrose to long and twisted. Calyptra cucullate. Spores finely papillose, 9-22 µm.
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