322 RADULA. 
Folia ad } lat. usque imbricata, supra lobulum divaricata, subplana, a 
basi (semicordata caulem transeunte) ultra $ complicata angulo 
plicam inter et caulem 45°-60°; lobus late oblongus, subfalcatus 
rotundatus repandulus ; lobulus triplo fere brevior, subrhombeus 
obtusus vel subacutus, planus, subappressus, solum ad carinam parur 
inflatus, basi in caule alte incurrens; cellule parvee conformes 
subeequilatero-hexagonee leptodermes convexulie, ambitu ex endoch- 
romio late opacze, solum in centro pellucidze——Mammilla radicellifera 
ad medium lobulum, juxta carinam, posita, humiliuscula. 
Flores dioici: 2 in dichotomiis. etiam in ramis monotropice innovandis 
quasi-laterales. Bractez foliis conformes, nisi pro lobulo longiore 
dimidium lobum zquante. 
Perianthia flavida foliis duplo longiora, subrecta, a basi brevi obconica 
lato-linearia, compressa, ore truncato bilabiata et vel repando-sub- 
crenulata Vel utraque facie medio breviter fissa exindeque 4-lobulata. 
Andrecia medio caule ramove posita, foliis consecutiva, vel ramulum 
totum sistentia ; bracteze sub 5-jugee, foliis vix minores, erectiores, 
dimidio inferiore sacculum oblongum erectum constantes, lobulo 
dimidium lobum superante apice ovato-rotundato. 
Var. Negrensis S. Major, 3-4-pollicaris flavida fulvave. Caules 
arctiuscule pinnati, raro subbipinnati; rami breves, medio (ad 
speciem) florem 9% gerentes, revera apice floriferi, innovatione recte 
continua prolongati. Hab. ad San Carlos del Rio Negro. 
Var. Campanensis S. Subbipinnata. Folia utraque basi cordata. 
Perianthia albida subbreviora, ore brevissime 4—5-loba et crenulata. 
Hab. M. Campana, in cortice, alt. 1200™. 
Obs. This is the commonest corticolous species of the Amazonian 
plain, yet I can nowhere find it described. The Mexican R. subinflata 
of Lindenberg and Gottsche seems the nearest, and many of its characters 
are the same; yet nothing is said of the strongly divaricate leaves—a 
marked feature of our species, distinguishing it from all other South 
American ones except ER. pseudostachya, nor are the perianths said to be 
compressed, whereas our plant has them much flattened, and (the short 
obconic base excepted) of equal breadth throughout, so as to be ligulate, 
or broadly linear, in outline. The lobule is slightly bullate at the root- 
bearing mammilla, but not so much so as in some other species, described 
in Syn. Hep., where it is not considered worthy of mention. 
Radula amazonica grows throughout the Amazon Valley, from the 
mouth of the Amazon to the cataracts of the Orinoco on the north, and 
on the south-west ascends the Peruvian Andes to about 4000 feet on Mt. 
Campana. It grows always on the bark of trees, whereas its near ally, 
R. riparia, grows on shady rocks by streams ; and R. flaccida Lind. et G. 
always on living leaves, whether of trees and shrubs, or of palms, or of 
perennial herbs and ferns. v. +f 
The variety Campanensis looks distinct, from the whitish perianths, but 
I can find no good character to separate it from the type. 
9, RADULA RIPARIA Spruce. 
Hub. Tarapoto Andium Peruviz, ad rapes umbrosas in rivuli ripis. 
F16 x 12,14 x 1°25, lobulus ‘5 x 5; ¢ dys per 30 x “75mm, 
Elata pallide flava snbstratificata. Caules 3-pollicares ineequaliter 
vjinnati, ramis 9 furcatis. 
Folia subimbricata--ramorum  sterilium  subdissita—patentissima vel 
