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Cyrto-Hypnum (Hampe) Hampe & Lorentz in Hampe, Bot. Zeit. 27: 455. 1869.
[Greek cyrto, curved or arched, and hypnum, lichen, or by usage, pleurocarpous moss]
William R. Buck
Hypnum subg. Cyrto-hypnum HampeThuidium sect. Minutula SchimperThuidium subg. Microthuidium Limpricht
Plants small and slender, 1--2-pinnate; paraphyllia filamentous, unbranched; axillary hairs 2-celled. Stem leaves broadly triangular to broadly ovate, acuminate; margins crenulate-papillose, often recurved at least below; costa strong, extending 4/5 the leaf length to subpercurrent; cells ± quadrate, pluripapillose (or 1-papillose extralimitally) on both surfaces, usually with the papillae arranged around the periphery of the lumina. Branch leaves typically smaller than stem leaves, ovate to oblong-ovate, obtuse to short-acuminate; margins as stem leaves but plane; costa strong, ending 3/4--7/8 the leaf length, sometimes crested or the apex projecting as a small spine; cells similar to those of stem leaves. Sexual condition autoicous. Perichaetial leaves strongly differentiated, erect, oblong-lanceolate to oblong-ovate, acuminate; margins entire to ciliate; costa percurrent to excurrent. Seta slender, smooth or papillose. Capsules inclined to horizontal, cylindric; annulus differentiated in 2--3 rows; operculum obliquely long-rostrate; peristome hypnoid with endostomial segments not or narrowly perforate and cilia 1--3. Calyptra cucullate, naked.
Species 30--40 (4 in the flora): mostly tropical.
SELECTED REFERENCE
Buck, W. R. and H. A. Crum. 1990. An evaluation of familial limits among the genera traditionally aligned with the Thuidiaceae and Leskeaceae. Contr. Univ. Michigan Herb. 17: 55--69.
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| 1 |
Stems 1-pinnate; branch and stem leaves of about the same size, larger than 0.4 mm, strongly incurved when dry. |
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Cyrto-hypnum involvens |
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Stems 2-pinnate (sometimes inconspicuous); branch leaves smaller than stem leaves, less than 0.4 mm, erect to somewhat but not strongly incurved when dry. |
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(2) |
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| 2 (1) |
Stems and branches as well as the paraphyllia papillose. |
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Cyrto-hypnum pygmaeum |
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Stems and branches with papillose paraphyllia, but not papillose themselves. |
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(3) |
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| 3 (2) |
Stems weakly and irregularly 2-pinnate; cells of paraphyllia mostly twice as long as wide; seta smooth; perichaetial leaves serrulate. |
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Cyrto-hypnum minutulum |
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Stems regularly 2-pinnate; cells of paraphyllia mostly quadrate; seta rough; perichaetial leaves ciliate. |
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Cyrto-hypnum schistocalyx |
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Lower Taxa
Related Synonym(s):
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