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Orthotrichum Moss

Orthotrichum anomalum Hedwig 1801

Comprehensive Description

provided by North American Flora
Orthotrichum anomalum Hedw. Sp. Muse. 162. 1801
Orthotrichum canadense Bruch & Schimp. Lond. Join-. Bot. 2: 667. 1843.
In rather dense mats or tufts, dark green to almost black, rather rigid, 1-2 cm. high, sparingly branched; leaves closely imbricate when dry, ovate-lanceolate to oblong-lanceolate, rather abruptly acute to narrowly obtuse at the apex, 1.7-2.5 mm. long, the margins entire, strongly revolute; costa strong, reaching nearly to the apex; basal leaf -cells rectangular, usually hyaline, often thin-walled, smooth, the upper rounded-hexagonal, incrassate, papillose, about 10-15 fl in diameter, in a single layer; autoicous; capsules faintly ribbed just after the operculum falls, when moist ovoid to ovoid-cylindric, when very old somewhat narrowed below the mouth, when thoroughly dry and empty cylindric, tapering rather sharply at the base, usually quite exserted (the perichaetial leaves sometimes reaching the base of the capsule when moist), with 8 plain ribs and often with 8 less distinct ribs between, the urn 1.5-2 mm. long; calyptra moderatelv hairvr exothecial cells very distinctly differentiated along the principal ribs; stomata immersed; annulus present; operculum conic-rostrate; peristome-teeth 16, more or less paired, marked with faint sinuous lines, irregular in length and direction, typically with a short preperistome which is lacking or difficult to see in American plants, the segments rudimentary or absent, occasionally as long as the teeth but very slender and fragile ; spores maturing in early spring.
Type locality: Europe.
Distribution: On stones, chiefly calcareous; Canada, north to the Yukon Territory; common in limestone regions in the northeastern United States, west to the Rocky Mountains, south to New
Mexico; Europe; Asia; Africa.
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bibliographic citation
North American flora. vol 15A (1). New York Botanical Garden, New York, NY
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