1. Philonotis cernua (Wilson) D. G. Griffin & W. R. Buck, Bryologist. 92: 376. 1989.
Glyphocarpa cernua Wilson, J. Bot. (Hooker) 3: 383. 1841; Bartramidula carolinae Flowers
Plants small, delicate, in lax to dense tufts, glaucous or yellowish throughout. Stems 0.5(-2) cm, erect, simple; tomentose proximally. Leaves laxly erect-appressed, sometimes somewhat secund when dry, erect-spreading when moist, lanceolate, 0.5-1 mm; margins plane to weakly revolute, serrulate distally, teeth single; apex acute to acuminate; costa percurrent, abaxial surface rough; laminal cells prorulose at one or both ends; basal cells similar to distal cells, wider (6-8 µm); distal cells rectangular, 20-30 × 4-6 µm. Specialized asexual reproduction absent. Sexual condition synoicous. Seta 0.5-1.5 cm, curved. Capsule 0.8-1.5 mm, smooth to irregularly wrinkled when dry. Spores reniform, 36-44 µm.
Capsules mature Mar-Oct. Wet acidic rock in mountains; moderate elevations (1200-1500 m); N.C., Tenn.; Mexico; Central America; South America; w Europe (United Kingdom).
Philonotis cernua a diminutive species that is identified by its synoicous sexual state, globose, smooth to irregularly wrinkled capsules, and lack of a peristome.