Barbula

• Authority

  Sharp, Aaron J., et al. 1994. The Moss Flora of Mexico. Part One: Sphagnales to Bryales. Mem. New York Bot. Gard. 69 (1): 1-452.

• Family

  Pottiaceae

• Scientific Name

  Barbula

• Description

  Species Description - Plants in loose or dense, green, yellow-brown, brown, or blackish tufts. Stems up to 30 mm high; central strand present. Leaves oblong-spatulate to lanceolate or long-triangular, broadly concave or narrowly channeled, rounded to acute at the apex, weakly differentiated to sheathing at base; margins often recurved, entire to shghtiy dentate; costa subpercurrent to short-excurrent, rounded to semicircular in section, with epidermal layers differentiated and 2 stereid bands (or occasionally only a dorsal band), usually with 2-4 guide cells, sometimes accompanied by hydroids; upper cells subquadrate to short-rectangular, generally papillose; basal cells usually differentiated, rectangular, smooth or somewhat papillose. Dioicous. Inflorescences terminal. Perigonia gemmiform. Perichaetial leaves ovate to long-lanceolate, often enlarged; cells of the lower half generally elongate. Setae elongate, twisted clockwise below, often counterclockwise above; capsules short- to long-cylindric; annulus usually present, consisting of 1-2 layers of vesiculose cells, occasionally revoluble; operculum short- to long-conic; peristome weakly to strongly twisted, consisting of 32 filiform, spiculose teeth from a low basal membrane. Calyptrae cucullate, smooth.