Bryum viridescens Welw. & Duby

Species

Bryophytes > Bryales > Bryaceae > Bryum

Characteristics

Plants medium-sized to large, solitary or loosely caespitose, green above, reddish brown or yellowish brown below; terricolous or corticolous. Stems 5-35 mm tall, frequently branching by subperichaetial innovations, innovations to 15 mm tall, frequently tomentose; rhizoids reddish brown, papillose, tubers (200-)260-600(-800) µm, reddish brown or yellowish brown. Leaves comose, frequently in successive comal tufts, smaller below, appressed dry, erect-spreading and generally in a rosette wet; broadly oblong to obovate or infrequently spathulate, (1.6-)2.0-3.0(-3.8) mm long; apex obtuse or rarely acute; lamina frequently inflexed above; margins plane above, recurved in lower 1/2 to 3/4, entire to crenulate to denticulate; border absent. Costa strong, aristate, awn 180-360 µm long, smooth to denticulate above; in section subround to round, ventral surface cells present, dorsal stereid band strong, stereids in 3-5 rows, dorsal surface cells incrassate to substereid, hydroids present between guide cells and stereid band. Upper laminal cells hexagonal, pitted, 17-25 µm long, (12-)15-23 µm wide; basal cells rectangular to quadrate, pitted. Dioicous. Perichaetia terminal; leaves narrowly oblong to triangular, 1-2 mm long, costa aristate. Seta 18-35 mm long, reddish brown or yellowish brown; capsule pendulous, oblong-cylindrical or infrequently pyriform, frequently contracted below mouth when dry, yellowish brown or reddish brown, urn 1.5-3.0 mm long, neck frequently wrinkled when dry, 1.0-1.2 mm long; exothecial cells irregular in shape, incrassate, smaller above; peristome double, exostome teeth narrowly oblong-acuminate, hyaline above, yellowish to yellowish brown below, finely papillose, endostome segments tapering above, broadly perforated, cilia 3-4, appendiculate, basal membrane high, yellowish, minutely papillose; operculum mammillate or rostellate; calyptra not seen; spores 12-20 µm, papillose.
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Foliage retention deciduous
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Cultivation

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Distribution

Bryum viridescens world distribution map, present in South Africa

Identifiers

LSID 35153066
WFO ID wfo-0001177444
COL ID NKGZ
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Wikipedia (EN)
Wikipedia (FR)

Synonyms

Bryum viridescens