Cyrto-hypnum pygmaeum

(Schimper) W. R. Buck & H. A. Crum

Contr. Univ. Michigan Herb. 17: 67. 1990.

Basionym: Thuidium pygmaeum Schimper in P. Bruch and W. P. Schimper, Bryol. Europ. 5: 162. 1852
Treatment appears in FNA Volume 28. Treatment on page 377. Mentioned on page 376.

Stems 2-pinnate, stems and branches papillose; paraphyllia (1–)2–4(–5) cells in length, cells 1:1, strongly papillose. Stem leaves slightly incurved when dry, ovate-triangular, 0.2–0.4 mm; apex acuminate; costa 3/4 leaf length. Branch leaves erect-incurved when dry, 0.2–0.3 mm on primary branches, 0.2 mm on secondary branches; apex acute to short-acuminate; costa 1/2–3/5 leaf length, straight, not covered with cells apically. Perichaetial leaves with margins subentire proximally, serrulate distally. Seta smooth. Capsule with endostome cilia in pairs.

Phenology: Capsules mature summer (Jul–Sep).
Habitat: Moist woods, moist rock, limestone, sandstone, quartzite
Elevation: low to moderate elevations


V28 591-distribution-map.gif

Ont., Que., Ala., Ark., Conn., Fla., Ga., Ill., Ind., Iowa, Ky., Mass., Mo., N.J., N.Y., N.C., Ohio, Okla., Pa., Tenn., Vt., Va., Wis., Asia (China, Japan, Korea).


Cyrto-hypnum pygmaeum is the smallest species of the genus in the flora area; the diminutive stature coupled with papillose stems and branches is distinctive. The species is most likely confused with Heterocladium macounii (Pterigynandraceae), which also has multipapillose laminal cells and papillose stems and branches. However, H. macounii is larger and has a costa ending near or before mid leaf and is without paraphyllia; pseudoparaphyllia are present, but these have pointed apical cells, not truncate as are the paraphyllia cells of C. pygmaeum.

Selected References


Lower Taxa

... more about "Cyrto-hypnum pygmaeum"
William R. Buck +
(Schimper) W. R. Buck & H. A. Crum +
Thuidium pygmaeum +
Ont. +, Que. +, Ala. +, Ark. +, Conn. +, Fla. +, Ga. +, Ill. +, Ind. +, Iowa +, Ky. +, Mass. +, Mo. +, N.J. +, N.Y. +, N.C. +, Ohio +, Okla. +, Pa. +, Tenn. +, Vt. +, Va. +, Wis. +, Asia (China +, Japan +  and Korea). +
low to moderate elevations +
Moist woods, moist rock, limestone, sandstone, quartzite +
Capsules mature summer (Jul–Sep). +
Contr. Univ. Michigan Herb. +
Thuidium subg. Microthuidium +  and Thuidium sect. Minutula +
Cyrto-hypnum pygmaeum +
Cyrto-hypnum +
species +