Cyrto-hypnum involvens (Hedw.) W.R.Buck & H.A.Crum

  • Authority

    Buck, William R. 2003. Guide to the plants of central french Guiana. Part 3. Mosses. Mem. New York Bot. Gard. 76: 1-167.

  • Family

    Thuidiaceae

  • Scientific Name

    Cyrto-hypnum involvens (Hedw.) W.R.Buck & H.A.Crum

  • Description

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    Species Description - Plants small and slender, in typically stiff, dull, mostly dark green (becoming golden with death), often dense mats; stems to ca. 3 cm long, 1-pinnate; paraphyllia usually very sparse on stems, absent on branches, filamentous, 1(2)-seriate, unbranched, to ca. 8 cells long, the cells quadrate, ca. 1:1, all cells sparingly pluripapillose, the distal cell truncate. Stem and branch leaves scarcely differentiated, stem leaves flexuosely incurved when dry, spreading when moist, ovate- triangular, ± abruptly short-acuminate, (0.3)0.5-0.6 x 0.2-0.3 mm; margins crenulate-papillose throughout, plane or narrowly recurved below; costa disappearing in the acumen but not filling it; cells ± quadrate, ca. 8-9 pm in diameter, obscurely pluripapillose on both surfaces, the papillae arranged around the periphery of the lumina, scarcely differentiated in the acumen or toward the insertion. Branch leaves strongly incurved when dry, spreading when moist, ± 2- ranked, often laxly disposed, oblong to oblong-ovate, obtuse to acute, ca. 0.5 x 0.2-0.3 mm, concave; margins regularly crenulate-serrulate, plane or narrowly recurved below; costa ending ca. 7/8 the leaf length, often ± flexuose, apex projecting at back as a small spine; cells ± quadrate, ca. 8-9 µm wide, pluripapillose with (1)2-4(5) papillae/cell on both surfaces, the papillae arranged around the periphery of the lumina. Perichaetial leaves laxly serrulate above, subentire below or with a few coarse, blunt teeth, not ciliate; costa extending into and filling the acumen. Setae roughened throughout, 0.8-1.5 cm long; capsules inclined to subpendent, broadly short-cylindric, 1.0-1.3 mm long. Calyptrae cucullate, naked, smooth.

  • Distribution

    In non-flooded moist forests, rare, ca. 200 m, typically on rotten logs or limestone but the single specimen found locally in knothole of fallen tree.

    French Guiana South America|