139 
Brazilian species, and to greatly extend its range. Strangely 
enough, West Indian specimens are still lacking. 
FissIpDENS DONNELLY Aust. Bot. Gaz. 4: 151. 1879 
Fissidens tenerrimus C. Muell. Act. Soc. Sc. Fenn. 19: to. 1891. 
Fissidens crenato-serrulatus Card. Rev. Bryol. 36: 70. 1909. 
Plants minute and decumbent, growing at the base of trees 
only in tropical or subtropical regions: sterile stems 2-3 mm. 
high with 6 or 7 pairs of leaves, the 
uppermost smaller than those of the 
fruiting plants, only r mm. long by 0.16 
plants; leaves more or less secund when 
dry, usually few, only 3-5 pairs, very 
unequal in size, the uppermost or peri- 
chaetial leaves 1.5 mm. long by 0.25 
mm. wide, expanded at base, incurved, 
falcate, and usually one of the leaves 
narrower and contracted below the 
junction of the duplicate blades; mar- 
gins not bordered, sharply and regu- 
larly crenate-serrate, cells larger and 
natn *11 4 bs a Lt q J 
£ i I i 3 
narrowed at one side to the costa, 
sometimes contracted at the junction; Drawings from Austin’s type. 
costa ending below the acute apex, pe I- ae fapical t 
. . . . * SS-Set ic © wd dar 
lucid, crenulate m cross-section, with A i adie all 
OF ear, 
3 large central ducts and 2 narrow 
stereid bands; cells sharply mamil- 
lose, each with a large central papilla ; 
on both surfaces, except the inner face of the duplicate blades, 
those of the apical blade 8-13 #2 in diameter, irregularly hexag- 
onal, in cross-section thicker than wide; cells of duplicate blade 
Very irregular in shape and size, up to 18 w, next the vein; the 
margins coarsely and unequally toothed. Synvicous, the an- 
theridia terminal on small basal plants, usually few, 2 or 3 
mixed with the archegonia and without paraphyses. Seta erect 
or bent at base, 2-3 mm. long; capsule erect and symmetric, small, 
only 0.66-0.75 mm. long, with a lid which equals the urn and 
has a long straight or curved beak; calyptra covering only the 
beak; walls not thickened, of clear oblong cells up to 27 # long; 
2. Cross-section of basal part 
of leaf, 
