Fissidens validicostatus Müll. Hal.

Fissidens validicostatus Sull.; C. Miill
Linnaea42: 465. 1878.
Plants gregarious, small, rarely branching; fertile stems up to 1 mm. high, the sterile up to 3 mm.; leaves linear-lanceolate, gradually and evely narrowed to the slender acute apex, up to 1.5 mm. long, the margins entire to slightly crenulate, not bordered, the costa stout, sometimes somewhat flexuous; vaginant laminae very unequal, extending to a little more than one-third the length of the leaf; dorsal lamina narrow, often not reaching the stem, and often lacking in the lower leaves; apical lamina 4-8 cells wide at junction with vaginant laminae, gradually growing less toward the apex to a single cell at the base of the excurrent part of the costa; leaf-cells in apical lamina irregularly hexagonal, isodiametric to elongate, 13-23 /i in longest diameter, smaller and often quadrate on the margins, more elongate near the costa especially in the vaginant laminae, all incrassate; dioicous; seta terminal, somewhat flexuous, up to 4 mm. long; capsule oblong-ovoid, erect and symmetric, the urn about 0.6 mm. long; operculum long-rostrate, reaching 0.4 mm. ; peristome normal for the genus (not fully developed in the type). 189
44. F. stenopteryx.
'Type I.OCAUTY: Venezuela {Fendler 13).
Distribution: Venezuela; also on rocks by bank of brook beside the road to Mt. Britton ir'uerto Kico {^Steere cr* Grout).
'Pj.Arn6.f.80-85.