Polytrichastrum sexangulare (flörke ex Brid.) G.l.sm.

Northern haircap (en)

Species

Bryophytes > Polytrichales > Polytrichaceae > Polytrichastrum

Characteristics

Plants small to medium, rather wiry, dark green to reddish brown with age. Stems 1-3(-6) cm, simple, erect or decumbent, the cortical cells thin-or thick-walled. Leaves 3-6 mm, loosely to densely imbricate, erect-incurved at the tips and appressed to the stem when dry, erect-spreading when moist, obtusely cucullate, often secund; sheath broadly elliptic, hyaline-margined, gradually tapering or abruptly contracted to the blade; blade lanceolate to ligulate, almost tubular when dry; costa percurrent or slightly excurrent, cucullate at the apex, rarely bluntly mucronate; marginal lamina 2-6 cells wide, entire to obscurely denticulate, slightly broader and inflexed in the distal part of blade, covering the lamellae; lamellae 5-8(-11) cells high, minutely crenulate in profile, the marginal cells in section larger than those beneath, narrowly ovate to pyriform, smooth or very rarely indistinctly papillose; median sheath cells elongate-rectangular, (18-)24-40 × 8-10(-18) µm; cells of marginal lamina 11-15 µm, quadrate to short rectangular, ± equally thick-walled; perichaetial leaves slightly longer than the foliage leaves. Seta 1.5-3 cm, rather stout, straight or arcuate with age. Capsule 2-3 mm, short-cylindric to ovoid to globose, bluntly (4-)5-6-angled to terete, erect to horizontal to nodding; hypophysis small, scarcely delimited, stomata large and scattered on the proximal 1/3 of the urn; exothecium smooth, the cells variable in shape, trigonal to hexagonal, with a diffuse thin spot; peristome pale 220-300 µm high, divided to 0.3-0.5, the teeth 50-64, slender, of uniform size, or short triangular, the alternate teeth smaller. Spores 16-18 µm.
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Images

Polytrichastrum sexangulare unspecified picture

Identifiers

LSID 35169094
WFO ID wfo-0001186712
COL ID 4LPPQ
BDTFX ID -
INPN ID 433979
Wikipedia (EN)
Wikipedia (FR)

Synonyms

Polytrichum sexangulare Polytrichastrum sexangulare Polytrichum crassilamellatum Polytrichastrum sexangulare var. sexangulare

Lower taxons

Polytrichastrum sexangulare var. vulcanicum