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FNA | Family List | FNA Vol. 28 | Orthotrichaceae | Macromitrium

1. Macromitrium richardii Schwagrichen, Sp. Musc. Frond. Suppl. 2(2,1): 70, plate 173 [bottom]. 1826. (as Macromitrion richardi).

Stems with branches to 1 cm, simple or 2-fid. Branch leaves 0.7-1.8 mm; basal laminal cells tuberculate or smooth, walls thick; distal cells bulging mid leaf, grading to papillose-bulging at tip. Seta dextrorse. Capsule with exothecial cells not differentiated; stomata at capsule base; exostome teeth rudimentary, delicate, pale yellow. Spores 22-32 ┬Ám, densely papillose.

Capsules mature spring. Branches and trunks of trees; low elevations; Fla., La., Miss.; Mexico; West Indies; Central America; South America.

Macromitrium richardii is distinguished from other mosses with similar creeping stems and erect branches by its non-rugose, inrolled leaves and uniformly elongate basal laminal cells. The papillose-bulging distal laminal cells and autoicous sexual condition distinguish M. richardii from other species of Macromitrium in the tropical portions of its range.


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