Muscr Exoricr.—AHunboldtiani. 
HOOKERIA RADICULOSA. 
Hookeria caule repente vage ramoso, ramis compressis 
subtus denudatis, supra foliosis, foliis ovatis subacu- 
minatis integerrimis, nervo ultra medium evanescente, 
capsula ovata cernua, operculo rostrato curvato, caly- 
ptra basi integra. (Tas. LI.) 
Has. Crepidines juxta Caripe, locis scopulosis, temperatis, irri- 
guis, altitudine 480 hexapod. Humboldt et Bonpland. 
Caules repentes, ramosi, subtus foliis destituti, fibris numerosis 
fuscis radicantibus obsiti, lateribus facieque superne foliosi. 
Folia subcompressa, parum concava, ovata, subacuminata, ni- 
tida, flavo-viridia, omnino integerrima, nervo ultra medium 
evanescente instructa. Substantia compacta, minute punc- 
tata. Perichetialia magis acuminata, nervosa. Seta sub- 
unciam longa, flexuosa. Capsula ovata, cernua, Calypira 
subulata, integra. Operculum conico-rostratum, flavum, rostew. 
decurvo. Peristomium, ut in Leskea, flavescens. 
Among the Humboldtian mosses a considerable portion be- 
longs to the genus Hookeria, or such plants as have all the cha- 
racters of a Hypnum or a Leskea, except the dimidiate calyptra. 
The present species differs from most of the family in having a 
single nerve to the leaf, and the under side of the stem destitute 
of leaves, as in Anictangium torquatum. 
Fig. 1, plants zat. size. Fig. 2, upper side of a portion of the 
stem. Fig. 3, under side of ditto. Fig. 4, leaf. Fig. 5, apex 
of ditto. Fig. 6, perichatial leaves. Fig. 7, calyptra. Fig. 8, 
capsule and operculum. Fig. 9, ext. peristome. Fig. 10, int. 
ditto.— magn, 
