Thuidium
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Authority
Buck, William R. 2003. Guide to the plants of central french Guiana. Part 3. Mosses. Mem. New York Bot. Gard. 76: 1-167.
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Family
Thuidiaceae
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Scientific Name
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Description
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Genus Description - Plants mostly large and coarse, in typically stiff, dark green to golden, loose mats; stems arched to creeping, mostly regularly 2-3-pinnate, mostly frondose; paraphyllia abundant or rarely sparse, filamentous to foliose, branched, the cells papillose. Stem leaves mostly spreading when moist, usually broadly ovate, acuminate, often plicate. Branch leaves lanceolate to oblong to ovate, obtuse to short-acuminate, usually concave, not plicate; margins serrate to serrulate, usually plane; costa weaker than in stem leaves, sometimes projecting as a spine at apex; cells mostly isodiametric, mostly unipapillose, sometimes pluripapillose, always just at back, the papillae sometimes curved, thin- to thick-walled, the apical cell sometimes differentiated; alar cells not differentiated. Dioicous. Perichaetial leaves typically ciliate. Setae stout, smooth, red-dish; capsules horizontal to pendent, asymmetric and arcuate, cylindric. Calyptrae cucullate, naked or sparsely hairy, smooth or roughened. Thuidium is characterized by large plants with pinnately branched stems, often frond-forming, and usually with abundant paraphyllia. The papillose, ± isodiametric cells are also helpful generic markers.