Plant Guide > Mosses and Lichens > Mosses > Genus Tetradontium > Tetradontium Repandum Moss

Tetradontium Repandum Moss

Tetradontium Repandum MossTetradontium repandum, Schwaegr.

Habit and habitat.-Very small, growing in loose clusters on shaded rocks.

Name.-The specific name repandum, the Latin for "curved," refers to the margin of the mouth of the spore-case.

Plant (gametophyte).-Stems very short, bearing little gemmae at the base of thread-like leafy branches.

Leaves.-Ovate-lance-shaped, rigid, red-brown, closely overlapping like shingles.

Leaves at the base of the pedicel (perichaetial leaves).-Ovate and oblong, very concave, vein obscure; scales about the male flowers (perigonium) smaller, thinner, vein absent.

Habit of flowering.-Male and female flowers on the same plant (monoicous).

Veil (calyptra).-Conical, resembling a bishop's mitre and covering the spore-case to the base.

Spore-case. Thick, oval, the margin of the orifice somewhat notched between the teeth.

Pedicel (seta).-Thick and rigid.

Lid (operculum).-Conical, erect, short.

Teeth (peristome).-Simple, of four short, triangular teeth.

Spores.-Mature in autumn.

Distribution.-Near Glen House and at Dixville Notch, White Mountains. Very rare.