Cyrto-hypnum
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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 small and slender, in mostly green but occasionally golden, lax mats; stems 1-2-pinnate, not frondose; paraphyllia few to relatively abundant, usually confined to stems, filamentous, mostly unbranched, just the distal cell or all cells papillose. Stem leaves mostly broadly ovate, acuminate, seldom plicate. Branch leaves lanceolate to oblong to ovate, obtuse to rarely short-acuminate, usually concave, not plicate, not or slightly decurrent; margins mostly crenulate-papillose, less often serrate to serrulate, usually plane; costa weaker than in stem leaves, sometimes projecting as a spine at apex; cells quadrate to short-rectangular, mostly pluripapillose, occasionally unipapillose, always on both surfaces, the papillae (when pluripapillose) usually arranged around the periphery of the lumina, thin- to firm-walled, sometimes becoming more elongate in the acumen; alar cells not differentiated. Autoicous. Setae slender, smooth or roughened either throughout or just above, reddish; capsules suberect to horizontal, rarely ± pendent, often asymmetric and arcuate, cylindric. Calyptrae cucullate, mostly naked, smooth or roughened above. In Cyrto-hypnum the small, autoicous plants have leaf cells typically pluripapillose, but more importantly the papillae occur on both leaf surfaces, rather than just at back, as in Thuidium. The paraphyllia are simple or rarely little-branched. The setae are commonly (always in our flora) roughened. Probably the easiest way to recognize Cyrto-hypnum is by the small size of the plants. Since they are mostly fertile it is usually not difficult to verify the sexuality. Plants often occur in calcareous habitats and often grow intermixed with other mosses, making them easy to overlook.