FOSSOMBRONIE. 525 
nuda, 2-3na. Per. campanulata, phyllis postice discretis. Capsula 
pedetentim rupta. Spore asperrime. 
35. NorErocnapA. Grandiuscula succulenta. F. subrotunda. Anthe- 
ridia solitaria, in pustulis primum clausis demum ruptis recepta. 
Per. compresso-cyathiformia, phyllis basi connatis, apice alte liberis, 
bilabiata. Caps. subregulariter 4-valvis. Spore leeves. 
§ 2. LEPTOTHECE. 
Vegetatio frondosa rara foliosa. Perianthiwm perseepe nullum, raro 
perfectum subcylindricum., Calyptra prelonga subcylindrica, pistillidiis 
sterilibus basi et altius—interdum solum in ipso apice—obsita. Capsula 
longipes, oblongo-cylindrica, unistrata, cellulis angustis vacuis conflata 
4-valvis, suturis valvularum demum sepius imperfecte solutis, sicusi 
dehiscentia frequenter solum unilateralis videtur. Elateres di- (raro ex 
p- mono-) spizi, alii in capsule apice dintius persistentes. Antheridia in 
foliosis laxe axillaria 2—5na; in frondosis in alveolis cost marginalibus 
nidulantia, solitaria, minute unibracteata. 
A. Foliose. 
36. Scatra. Caules basi rhizomatosi, radicellis omnino carentes. F. 
tristicha, subopposita. Per. 0. Cal. magna. Capsula subeylindrica 
seepe hine solum hians. 
B. Frondose. 
37. SympHyoeyNA. Fr. lineares dichotome, interdum serrate vel pinna- 
tifide ; costa angusta, filo axiali lignoso percursa. Fl. 9 vel termi- 
nales vel antici et subsessiles, minute involucrate. Per. 0. Cal. 
longissima carnosa apice pistillidiis sterilibus coronata. Capsula in 
dehiscentia quadrivalvis, valvulis interdum apice coheerentibus. 
38. PALLAVICINIA. A Symphyogyna vix discrepat nisi pro perianthii 
tubularis preesentia, et calyptra tenuiore solum infra medium pistil- 
lidia sterilia gerente. 
39. Monocirea. Frondes cuneate dichotome, costa prelata et crassa 
percursee. Fl. 2 terminales, in coste apice cavo absconditi, exin- 
volucrati. Per. 0. Calyptra compresso-cylindrica, apice bilabiata, 
inclusa. Capsula exserta oblongo-cylindrica, uno solo latere dehis- 
cens, demum fere explanata. 
Obs. The plants I have grouped in this subtribe are confessedly a some- 
what heterogeneous assemblage, and might perhaps have been better 
divided into two or even three subtribes; but the species I gathered are 
so few, and they belong to so few genera, that I profit by the very slight 
bond of union between them to join them in one. There is in none 
of them any distinct male spike, with proper bracts, but the antheridia, 
even in the foliose genera, stand along each margin of the stem, slightly 
or not at all veiled by adjacent lateral leaves, which are not sensibly 
modified in form, or more closely-set than ordinary stem-leaves; the 
antheridia are thus either quite unprotected, as in Fossombronia, or they 
are contained in little pits (alveoli) closed at first by the cortical stem- 
layer, which is finally ruptured to allow the contents of the antheridia 
to escape, as in Noteroclada, Pellia, &c. In some frondose genera the 
pits are open from the first, but partially veiled by small toothed bracts, 
which are often confluent along the margin of the stem (or costa) into a 
linear wing : e.g. in Symphyogyna, Pallavicinia, Blasia, &e. Sometimes, 
