Leucomium
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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
Leucomiaceae
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Scientific Name
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Description
Description - Plants smallish to medium-sized, in typically pale green, sometimes silvery, often dense, extensive, flat mats; stems fragile, freely but irregularly branched, often densely so, complanate-foliate. Leaves sometimes contorted when dry, often ± falcate, densely foliate, lateral and dorsal leaves somewhat differentiated, oblong-lanceolate, triangular-lanceolate or ovate-lanceolate to ovate, gradually or abmptly short- to long-acuminate, ± symmetric; margins entire, plane or narrowly recurved when dry; costa none; cells long-rhomboidal to linear-hexagonal, lax smooth, thin-walled, becoming somewhat shorter across the insertion. Autoicous or synoicous, rarely dioicous. Setae elongate, smooth throughout or often obscurely roughened at base of capsule; capsules inclined to horizontal, cylindric, symmetric, with a well defined roughened stomatose neck. Leucomium was monographed by Allen (1987), and only two species were left in the genus.