Fissidens rochensis Brotherus ex Urban 1903

Fissidens rochensis Broth. Symb-Ant. 3: 421. 1903
Plants smaller and more slender than in F. grandifrons, cespitose in dense rigid cushions, dark green, not glossy; stems up to 1.5 cm. long, fuscous-radiculose at base, mostly simple; leaves rigid, many pairs, not changed in drying, 1.1-1.3 mm. long, about 0.25 mm. wide, narrowly oblong-lanceolate, broadly acute, nearly or quite entire, bordered almost to the apex by long narrow cells, the costa strong, vanishing below the apex; vaginant laminae unequal, about half the length of the leaf; dorsal lamina narrow, reaching the stem, not bordered below; apical lamina of at least two layers of cells except at the margins; leaf-ceUs minute, 5-6 p., incrassate, irregular and roimded, smooth; other characters unknown.
Type locaIvITy: Guadeloupe, in Roche Creek on rocks, alt. 680 m. {Duss 116; isotype seen at N. Y. Bot.Gard.).
Distribution: Guadeloupe; Jamaica {Nichols 14) Puerto Rico {E. G. Britton b" Delia Marble 485) ; Dominica (F. E . Lloyd) .
PI.ATE 10./. 140-144.
Section 12. Octodiceras Mitt. Jour. Linn. Soc. 12: 581. 1869; Brid. Muse. Recent. Suppl. 1: 162 (as genus). 1806. Plants slender, aquatic, long, soft, and floating; central strand lacking; seta shorter or little longer than the perichaetial leaves; stomata lacking.
Plants rarely over 4 cm, long; seta longer than the capsule. 67. F. Hallianus. Plants 5-15 cm. long; habit of Fontinalis.
Seta shorter than capsule; peristome-teeth truncate. 68. jP. debilis.
Seta longer than capsule; peristome-teeth forked and slender-pointed. 69. F. manateensis.