486 TOETULACEAE. 



obtuse; margins entire or serrulate, flat or recurved, sometimes bordered; costa 

 ending below the apex, percurrent or excurrent into a slender awn, papillose on 

 both surfaces; upper cells smooth or papillose; lower cells longer and smooth. 

 Monoicous or dioicous. Pedicel erect; capsules erect or nodding, ovoid or 

 eylindric; annulus present; peristome single, of 16 short, erect or slightly 

 twisted, papillose, teeth united at base, with a short exserted basal membrane; 

 lid short, conic-beaked; cells oblong; calyptra cucullate; spores rough or 

 smooth. [Latin, in reference to the basal union of the teeth.] A small genus 

 of about 12 species, varying in habit and distribution. Type species : Discranum 

 lati folium Hedw. 



1. Desmatodon Garberi Lesq. & James, Man. 112. 1884. 



Plants in dense round cushions, usually fruiting abundantly. Stems simple, 

 up to 1 cm. high with the leaves much twisted when dry and spreading when 

 moist, more crowded at apex of stems, only about 1 mm. long; margins in- 

 curved, entire, cfenulate or slightly toothed at apex; vein stout, smooth, ending 

 below the point or percurrent into the cuspidate apex; upper cells irregular, 

 rounded, and projecting on the inner surface, smooth on the back, lower cells 

 larger, clear, oblong and smooth. Dioicous. [Thus far only found sterile asso- 

 ciated with Tortula agraria; but the type specimens from Key West, show an 

 erect pedicel, about 5 mm. long; the calyptra cucullate; the capsule, with the 

 beaked lid, about 2 mm. long, brick-red, cylindric, the narrow annulus falling 

 in fragments with the lid ; peristome short, deeply inserted ; the teeth papillose, 

 fragile and broken, irregularly split and jointed, with no visible basal mem- 

 brane; spores smooth, pale, ripe in winter.] 



On limestone rocks in coppice, New Providence : Key West, Florida ; Yucatan. 

 GABBER'S DESMATODON. 



6. BARBULA Hedw. Fund. Muse. 2: 92. 1782. 



Plants usually a dirty green or brown color, often growing in muddy places. 

 Stems slender and sparingly branched. Leaves crowded, usually small and 

 narrowly lanceolate, keeled; margins recurved, seldom flat; vein stout, per- 

 current, rarely excurrent; cells of the upper part of the leaf dense, papillose 

 on both surfaces; basal cells larger, rectangular and nearly or quite smooth. 

 Dioicous: if sterile often propagating by brood-bodies. Pedicel erect, terminal ; 

 lid conic or beaked; calyptra cucullate; capsule usually erect, cylindric; annu- 

 lus sometimes present; peristome rarely lacking, usually inserted below the 

 rim of the capsule, of 32 slender, twisted, papillose teeth, united by a short 

 basal membrane; spores small. [Latin, diminutive of barba, beard, referring 

 to the peristome.] A large genus of 234 species, widely distributed in tem- 

 perate and subtropical regions. Type species: Bryum unguiculatum Hudson. 



1. Barbula Crugeri Sender; C. Muell. Syn. Muse. 1: 618. 1849. 



Plants small, in dark brown patches on damp rocks. Stems slender, seldom 

 more than 2 cm. high; leaves curled and twisted when dry, spreading when 

 moist, about 1 mm. long; base oblong, with thin rectangular cells; apex keeled; 

 upper cells minute, dense and papillose ; vein stout at base, rough on the back 

 and ending abruptly in the cuspidate apex; margins flat or revolute, entire or 

 rarely denticulate at apex. It has only been found sterile in the Bahamas, but 

 propagates by club-shaped brood-bodies borne in clusters, in the axils of the 



