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FNA | Family List | FNA Vol. 28 | Thuidiaceae

2. Cyrto-Hypnum (Hampe) Hampe & Lorentz, Bot. Zeitung (Berlin). 27: 455. 1869. • [Greek kyrtos, curved or arched, and hypnon, moss, alluding to incurved dry leaves].

William R. Buck

Hypnum subg. Cyrto-hypnum Hampe, Flora 50: 78. 1867; Thuidium subg. Microthuidium Limpricht; Thuidium sect. Minutula Schimper

Plants small. Stems creeping, 1- or 2-pinnate; paraphyllia filamentous, unbranched; axillary hairs 2-celled. Stem leaves broadly triangular to broadly ovate; margins recurved at least basally, crenulate-papillose; costa 3/4 leaf length to subpercurrent; laminal cells ± quadrate, multipapillose [1-papillose] on both surfaces. Branch leaves ovate to oblong-ovate; margins plane, crenulate-papillose; apex obtuse to short-acuminate; costa 1/2-7/8 leaf length, covered with cells apically or not; laminal cells ± quadrate, multipapillose [1-papillose] on both surfaces. Sexual condition autoicous; perichaetial leaves oblong-lanceolate to oblong-ovate, margins subentire to ciliate, costa percurrent to excurrent, laminal cells papillose. Seta smooth or papillose. Capsule inclined to horizontal, cylindric, asymmetric; annulus 2- or 3-seriate; operculum obliquely long-rostrate; endostome segments not or narrowly perforate, cilia 1-3.

Species 30-40 (4 in the flora): North America, Mexico, West Indies, Central America, South America, Europe, Asia; mostly tropical regions.

1 Stems 1-pinnate; branch leaves 0.5 mm, strongly incurved when dry.   1 Cyrto-hypnum involvens
+ Stems 2-pinnate (sometimes inconspicuous); branch leaves 0.1-0.3 mm, erect to somewhat incurved when dry   (2)
2 (1) Stems and branches papillose.   2 Cyrto-hypnum pygmaeum
+ Stems and branches smooth   (3)
3 (2) Stems weakly and irregularly 2-pinnate; paraphyllia cells 2:1; setae smooth; perichaetial leaf margins serrulate distally.   3 Cyrto-hypnum minutulum
+ Stems regularly 2-pinnate; paraphyllia cells 1:1; setae papillose; perichaetial leaf margins ciliate.   4 Cyrto-hypnum schistocalyx

Lower Taxa


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