Ecology. Dry interandean valleys; on soil. Elevation. 1680-1850 m. Distribution. Bolivia: Santa Cruz. World range: South America from Bolivia to Argentina and Chile; South Africa.
Pseudocrossidium crinitum is distinguished by the lanceolate to ovate-lanceolate leaves to 1.8 mm, bluntly acute to rounded apices, strongly recurved margin throughout, distinctly excurrent costa (awn), single ventral (adaxial) epidermial costal layer, absence of a ventral stereid band, and thin- to thick-walled, rectangular basal cells. Pseudocrossidium aureum (Bartr.) R.H. Zander is a synonym.
Specimens. Santa Cruz: Churchill 22338, 22356 (MO, USZ).
Additional notes: Tortula xerophila Herzog (Syntrichia xerophila (Herzog) S.P. Churchill) is either close or identical to Pseudocrossidium crinitum.
Project data for Tortula xerophila is given below:
Ecology. Chaco forest, dry inter-Andian valleys, probably Chaco Serrano forest; on soil and soil covered rocks. Elevation. 400-2100 m. Distribution. Bolivia: Chuquisaca, Cochabamba, Santa Cruz. World range: endemic to Bolivia.
This taxon is referable to Pseudocrossidium fide Cano et al. Tortula xerophila is based on two syntypes, both collected by Herzog, one from Palo (Department of Santa Cruz) and the other from Perico (Province of Juyuy, Argentina).
Specimens. Chuquisaca: Churchill et al. 22978 (HSB, MO); Santa Cruz: Nee & Solomon 36554 (MO); Churchill et al. 20435 (MO, USZ).