Trichostomum stenocarpum Wilson in B. Seemann, Bot. Voy. Herald, 344. 1857; Atractylocarpus costaricensis (Müller Hal.) R. S. Williams; A. stenocarpus (Wilson) Zander

Plants yellowish green, in loose tufts. Stems erect, 8-15 mm, radiculose proximally, erect-patent or curled when dry. Leaves 3.5-5 mm, 10-13 times longer than wide, narrowly lanceolate, gradually narrowed from an ovate base into a long acumen, entire at margins except for a few teeth at the extreme tip; costa filling ¹/3-²/3 of the leaf base, 175-200 µm wide, excurrent; alar cells weakly differentiated; basal laminal cells in 15-18 rows, hyaline, thin-walled, rectangular, 49-95 × 4-20 µm, narrower at margins; distal laminal cells elongate, 74-140 × 4-7.5 µm. Sexual condition dioicous; perichaetial leaves suddenly contracted from a broadly ovate base. Seta erect, 8-19 mm, sinistrorsely twisted distally. Capsule long-cylindric, 2.5-3 × 0.4 mm, yellowish or brownish with age; exothecial cells incrassate, rectangular; operculum long-rostrate, reddish brown, 1-1.2 mm; peristome teeth 16, divided almost to the base, yellowish brown, lighter at tips, striate proximally, papillose at tips, about 290 µm. Calyptra cucullate, entire at base. Spores yellowish green, 11-13 µm.

Rotten logs, stumps, soil, bases of trees, moderate elevations (100-200 m); Mo.; Central America.

Campylopodiella stenocarpa has been found only once in the flora area, in Stoddard County, Redfearn 27840, (BONN).