570 RICCIA. 
frondis superficie papilliformi aut conico-subulato.” (G, L. et N. 
Syn. Hep. 592.)* 
XLVII. RICCIA, Mich, Nov. Gen, 
‘“« Frondes repentes, primitus radiatim e centro divisa, laciniis 
dichotomis, in dorso [supra] planis depressis aut canaliculatis, in 
ventre [subtus] convexis nudis squamatisve, epidermide distincte 
eporosa, strato cavitatum aérearum in aliis obvio aliis deficiente. 
Fructus frondi immersi, nec nisi rupta superficie (superiori inferi- 
orive) denudati, sessiles. Jnvolucra nulla. Calyptra cum capsula 
tenui coherens, stylo diu persistente acuto prominulo coronata. 
Capsula intra calyptram sessilis.” (Syn. Hep. 598.) 
1. R. lanigera. Frons tenuicula intus vix cavernosa, subtus Janata, 
orbiculata, ad centrum usque partita, iteratim dickotoma, laciniis 
angustis subcanaliculatis, Capsule solitarize. Sporee magnee elevato- 
reticulate. 
2. Rk. amazonica. Frons crystallina cavernosa, tenuicula tamen, paulo 
radicellosa, bis dichotoma, laciniis latis retusis, Capsule 2—5-nee. 
Spore minores muriculate, 
3. R. crassifrons. Frons carnosissima, cavernosa, supra ad speciem reti- 
culato-venosa, ad centrum fere usque fissa, iteratim dichotoma, 
laciniis late lnearibus retusis medio 10 cellulas crassis, parum radi- 
celliferis. Capsulee 1-2-ne. Sporee magne minute reticulato- 
scaberule. 
1. RiccIA LANIGERA, Spruce. 
Hab. in fluvii Ramos, flam. Amazonum tributarii, ripis limosis. 
Frondis radius 10:0; ramuli 15x 0'7 ; cellule 7; capsule 35-4; spore 
Se 
a0-20 = 
Frons pallide viridis, sicca immutata, orbicularis, diametro 2°, ad basin 
usque partita, ter quaterve dichotoma, furcis angustis linearibus sub- 
canaliculatis, medio cellulas 2 vel 8 crassa, marginibus tenuis, intus 
vix cavernosa, subtus radicellis lanata; cellulee magnee leptodermes 
pellucide. 
* T have so few species of this suborder to describe, and I have had so little 
oceasion to study those of other countries—notably southern Europe and 
western Australia, where they grow far more abundantly than on the Amazon— 
that I quote from the ‘Synopsis Hepaticarum’ almost literally the characters 
of the suborder and of the solitary genus (Riccia) of which I gathered any speci- 
mens. The definition of the suborder might require a little modification to 
exclude Sphwrocarpus Mich., probably also Corsinia Raddi. and Tesselina 
Dum. 
All the South-American species I found belong to the subgenus &icciella, 
having the capsules immersed near the wnder surface of the frond. Of a few 
additional species, gathered on muddy shores of the Amazon and its tribu- 
taries, the specimens are missing, having probably been thrown away when the 
parcels were first opened, as mere lumps of dried earth, which they doubtless 
much resemble. 
