Hypnum schistocalyx Müller Hal., Syn. Musc. Frond. 2: 691. 1851; Thuidium schistocalyx (Müller Hal.) Mitten

Stems regularly 2-pinnate, stems and branches smooth; paraphyllia 2-8 cells in length, cells 1:1, papillose. Stem leaves appressed when dry, broadly triangular, (0.2-)0.3-0.4(-0.5) apex gradually and broadly acuminate, sometimes piliferous; costa 5/6 leaf length. Branch leaves incurved-appressed when dry, 0.1-0.2(-0.3) mm; apex acute to obtuse; costa 3/4 leaf length, straight, covered with quadrate cells apically, projecting as low crests. Perichaetial leaves with margins strongly flexuose-ciliate. Seta papillose. Capsule with endostome cilia 1 (or 2).

Capsule maturity unknown. Moist forests, limestone, base of trees; low elevations; Fla.; Mexico; West Indies; Central America; n South America.

Cyrto-hypnum schistocalyx, an essentially tropical species, is distinguished by the ciliate perichaetial leaves and roughened seta. The species occurs in Dade County; south of the flora area it occurs from sea level to 200 m elevation.