124 
Salmon . — On the Genus Fissidens. 
apicalis, et lamina dorsalis, haud limbatae, ob cellulis marginalibus 
prominentibus plus minus acutis minutissime serrulatae ; lamina 
dorsalis ad caulem attingens; cellulae minutae, circiter 5 /x diam., 
hexagonae, verrucosae (cellulis laevibus ad faciem laminarum verarum 
interiorem). Folia perichaetialia caulinis conformia, sed angustiora, 
longiora. Seta terminalis, vel innovando pseudo-lateralis, tenuis, 
6-8 mm. alta. Theca inclinata, plus minus inaequalis, parvula, 
cellulis externis magnis 25 /x diam., peristomii dentibus intus valde 
lamellosis, operculo rostellato, calyptra . . sporis laevibus 8-1 2 /x 
diam. 
Flos masculus aut in foliorum caulinorum axillis, aut e radicibus 
ad caulis basin nascens. 
Palria. Greenhouse, Kew Gardens, England; on a Tree Fern 
stem, brought from Jamaica in 1895 with Trichomanes scandens 
(leg. G. Nicholson, March, 1898). 
F. Ravenelii \ Sulliv., proximus, sed habitatione arborea, nec 
terrestri, foliis latioribus, laminae apicalis cellulis marginalibus 
acutis, nec truncatis, theca inclinata altius pedicellata distinctus. 
It is probable that F. Nicholsonii is a native of Jamaica, and 
was brought from there with the Trichomanes scandens. F. Ravenelii 
occurs in Carolina and Florida, and is closely allied, but differs in the 
narrower leaves, the vaginant laminae less distinctly limbate, the more 
or less truncate marginal cells of the apical and dorsal laminae, and 
the erect capsule. 
F. Ravenelii is described as being dioicous, but authentic specimens 
in the Kew Herbarium (Society Hill, S. Carolina, leg. Ravenel) are 
both autoicous and dioicous. 
Occasionally small, separate male plants, 4-6 leaved, as described 
by Sullivant, occur, but more frequently the plants are rhizautoicous, 
the male flowers being attached to the rhizoids at the base of the 
female stems. I have also found gonioautoicous plants, with the male 
flowers in the axils of the lower stem-leaves, just as sometimes occurs 
in F. Nicholsonii. 
(Since writing the above, I find that Wilson, according to MS. 
notes in his herbarium at South Kensington, had noticed as early 
as 1857 thfe variability of position of the male flower of F. Ravenelii. 
On one of his specimens is the note, ‘ decidedly monoicous ! $ fl. 
even axillary (W. 3-57);’ on another, * cf A- terminal on a stem, 
