Acaulon triquetrum

(Spruce) Müller Hal.

Bot. Zeitung (Berlin) 5: 100. 1847,

Basionyms: Phascum triquetrum Spruce London J. Bot. 4: 189. 1845
Treatment appears in FNA Volume 27. Treatment on page 638. Mentioned on page 639.
Plants three-angled, about 1 mm. Stem leaves cuspidate, keeled; laminal cells, 13–18 µm wide, 1–3:1, smooth. Seta as long as the diameter of the capsule. Spores 25–30(–40) µm, finely papillose.

Phenology: Capsules mature late autumn-spring.
Habitat: Soil, sand, clay, old fields, pastures, roadside banks, temporarily moist areas
Elevation: low to moderate elevations


V27 940-distribution-map.gif

Ont., Sask., Calif., Ill., Iowa, Mass., N.J., Tex., Va., W.Va., Europe, Asia, n Africa, Australia.


Acaulon muticum var. rufescens has reflexed apices while A. triquetrum does not always have these, though illustrated as such by H. A. Crum and L. E. Anderson (1981). The exsiccat C. F. Austin, Musci Appalachiani 52 has a short seta and the plant is 1.2 mm, and is placed here with A. muticum var. rufescens.



Lower Taxa

No lower taxa listed.