Dicranella heteromalla (Hedw.) Schimp., Coroll. Bryol. Eur. 13. 1856. Dicranum heteromallum Hedw., Sp. Musc. Frond. 128. 1801. Type. Europe.
Dicranella heteromalla var. pittieri Ren. & Card., Bull. Soc. Roy. Bot. Belgique 31(1): 145. 1893. Syntypes. Costa Rica, Potrero del Alto, massif du volcán du Poás, Pittier 5504, (NY, US); Barba et la Carrizal, Pittier 5505 (US), syn. nov.
Plants dark green; stems 10–20 mm high. Leaves 2–3 mm long, erect-flexuous to curved-secund, lanceolate to narrowly ovate-lanceolate, gradually narrowed to the apex; margins plane, entire below, serrulate above; costa excurrent, filling most of the upper leaf blade; cells rectangular to elongate-rectangular, firm-walled. Setae yellow, 5–15 mm long; capsules suberect or asymmetric and curved, 1.0–2.0 mm long, ovoid to cylindric; stomata absent; opercula 1.0 mm long, conic at base, long-rostrate above; annuli imperfect, of a single row of small thick-walled cells adhering to the capsule mouth after dehiscence; peristome teeth 400–500 µm long, divided halfway to the base into two hyaline, papillose forks, in lower 1/2 red and strongly striate-papillose, occasionally arising from a very low basal membrane. Spores 14–18 µm, lightly roughened.