views updated

Barbula (order Pottiales) A large genus of mosses, species of which are not always easy to distinguish. The plants are mostly small, forming tufts, cushions, or short turfs. Leaves may be blunt or pointed, but lack the hair-point typical of the related genus Tortula. Capsules are cylindrical and erect, with an oblique, beaked lid; the peristome has short, straight teeth in some species (e.g. B. tophacea and B. recurvirostra) and long, twisted teeth in others (e.g. B. fallax, B. unguiculata, and B. convoluta). There are many species, occurring mainly in temperate regions, and found on the ground, on walls, on garden paths, etc.