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1. Cyrto-hypnum involvens (Hedwig) W. R. Buck & H. A. Crum, Contr. Univ. Michigan Herb. 17: 66. 1990. (as Cyrtohypnum).
Leskea involvens Hedwig, Sp. Musc. Frond., 218. 1801; Thuidium involvens (Hedwig) Mitten
Stems 1-pinnate, stems and branches smooth; paraphyllia to 8 cells in length, cells 1:1, sparingly papillose. Stem leaves flexuose-incurved when dry, ovate-triangular, (0.3-)0.5-0.6 mm; apex ± abruptly short-acuminate; costa disappearing in but not filling acumen. Branch leaves strongly incurved when dry, 0.5 mm; apex obtuse to acute; costa 7/8 leaf length, ± flexuose, not covered with cells apically. Perichaetial leaves with margins subentire proximally or with few coarse, blunt teeth, laxly serrulate distally. Seta papillose. Capsule with endostome cilia single, rarely with rudimentary additional cilium.
Capsules mature winter [Nov-Dec(-Mar)]. Lowlands, moist forests, limestone, soil, humus, rotten wood; low elevations; Fla.; Mexico; West Indies; Central America; n South America.
Cyrto-hypnum involvens is distinguished by its 1-pinnate stems, strongly incurved leaves, non-ciliate perichaetial leaves, and rough seta. The aspect is quite different from the other species in the genus. Cyrto-hypnum involvens occurs between 0 and 1000 m elevation south of the flora area.
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