Macromitrium tomentosum Hornschuch in C. F. P. von Martius et al., Fl. Bras. 1(2): 21. 1840

Plants green. Branch leaves with distal leaves erect-spreading to spreading and widest distally, lanceolate-oblong to ovate-lanceolate, 1.5-3 mm; margins denticulate proximally as projecting cell ends, entire distally; apex acute, ending in long, linear, fragile subula; costa prominent, vanishing in subula, or often ending near apex in proximal leaves; distal laminal cells irregularly rounded to elliptic-hexagonal, 3-6 µm. Sexual condition dioicous, male plants similar to female; perigonia terminal. Seta 5-11 mm. Capsule oblong- to short-cylindric, 2.2-3.5 mm. Spores isosporous, 22-32 µm.

Trees, rock in subtropical forests; low elevations; Fla.; Mexico (San Luis Potosí, Tamaulipas); West Indies; Central America; South America; Asia.

Groutiella tomentosa has leaves narrowed to a rigid, long, often fragile subula.