Rev. Bryol. 39: 57. 1912.

Etymology: Genus Pylaisia and Greek adelphos, brother, alluding to resemblance
Treatment appears in FNA Volume 28. Treatment on page 580. Mentioned on page 572, 645.

Plants small, yellowish, weakly glossy. Stems 1–4 cm, not complanate-foliate, regularly to irregularly branched. Leaves erect-ascending to falcate-secund, homomallous, lanceolate to oblong-lanceolate, strongly curved; margins entire except near acumen; apex narrowly acuminate; ecostate or costa double; alar cells rounded, slightly to somewhat enlarged, usually inflated, pigmented, walls thick, cells in proximal row enlarged, middle lamella not apparent, supra-alar cells differentiated, many, quadrate; laminal cells somewhat flexuose, smooth. Sexual condition dioicous. Seta 0.5 cm. Capsule erect, ovoid to cylindric; exothecial cell walls not collenchymatous; operculum long-rostrate.


North America, Mexico, Central America, South America, Asia.


Species 4 or 5 (1 in the flora).

The distribution of Pylaisiadelpha is difficult to assess. According to W. R. Buck (1998b), the genus is diverse in the Asian tropics.