Tetrapterum tetragonum (Hook.) A.L.Andrews

Species

Bryophytes > Pottiales > Pottiaceae > Tetrapterum

Characteristics

Plants small, loosely caespitose, yellow-green; terricolous. Stem 2-4 mm tall, rarely branched; in section round, central strand large, cortical cells in 5-6 rows, thin-walled, smaller toward margin. Leaves spirally twisted around stem dry, erect-spreading wet; lanceolate, 1.5-1.8 mm long; apex acute, mucronate; base oblong or oval, erect-sheathing; margins plane, entire. Costa short-excurrent as 2-3 clear, smooth cells, ventral and dorsal superficial cells quadrate, papillose; in section reniform, guide cells 4-8, ventral stereid band 2-3 cells thick, ventral surface cells larger, quadrate, incrassate, papillose, dorsal stereid band 3-4 cells thick, dorsal surface cells quadrate, incrassate, papillose. Upper laminal cells quadrate, thin-walled, papillae low, 4-6 over lumen, O-shaped; basal cells rectangular, thin-walled, hyaline, smooth. Autoicous. Perigonia lateral on short branches; perichaetia terminal, leaves undifferentiated. Seta 1 mm long, yellow; capsule cleistocarpic, urn elliptical, bluntly beaked, with strong longitudinal ridges dry, ± quadrate in median transverse section, 1.5 mm long, red-yellow; exothecial cells rectangular, thin-walled; stomata phaneropore, present at base of urn; calyptra cucullate, obliquely beaked; spores round, 20-25 µm, papillose.
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Foliage retention deciduous
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Soil humidity 1-3
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Cultivation

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Distribution

Tetrapterum tetragonum world distribution map, present in South Africa

Identifiers

LSID 35105011
WFO ID wfo-0001149232
COL ID 55RRZ
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Wikipedia (EN)
Wikipedia (FR)

Synonyms

Tetrapterum tetragonum Systegium tetragonum Astomum tetragonum Phascum tetragonum