Muscr Exoricr.—Humboldtiani. 
HOOKERIA LESKEOIDES, 
Hookeria caule procumbente, ramis erectis, foliis secun- 
dis deltoideo-acuminatis striatis apice serrulatis, nervo 
ante apicem evanescente, capsula oblonga erecta, 
operculo subulato, calyptra subulata integra. (Tas. 
LV.) 
Has. In sylvis Cinchone prope Loxam, regione temperata, alti- 
tudine 1080 hexapod. _ Humboldt et Bonpland. 
Caules procumbentes. Rami erecti, simpliciter vel pinnatim ra- 
mosi. Folia undique inserta, secunda, deltoideo-acuminata, 
apice serrata, longitudinaliter striata, nervo ante apicem eva- 
nescente instructa. Perichetialia enervia, striata, serrulata, 
int. longe acuminata. Seta sesquiuncialis, flexuosa. Capsula 
oblonga, omnino erecta. Operculum subulatum, subobliquum, | 
Calypira mitriformis, subulata, levis, integra, vel casu solum- 
modo fissa. Peristomium Leskee, dentibus brevibus. 
In one individual out of a great number of specimens which I 
have examined, I found the calyptra cleft on’ one side about a 
fourth of the Jength upward. This I suppose to be an acciden- 
tal circumstance, as we know it sometimes to happen in the ge- 
nus Grimmia and Trichostomum ; and, taking it for granted 
that the veil is in reality mitriform, I place this plant among the 
Hookeria, though I regret to say it does not accord in habit with 
any other species of the genus. The general appearance of the 
plant is that of a Neckera ; and its capsule is, as in that tribe 
and in most Leskee, erect. Those who have most studied the 
mosses will be best aware how difficult it is to form generic cha- 
racters from the parts of fructification, which shall include only 
those individuals which appear allied by nature. 
Fig. 2, leaf. Fig. 3, 3, pericheetial 
Fig. 1, plants nat. size. 
ae portion of 
leaves. Fig. 4, capsule. Fig. 5, calyptra. Fig. 6, 
outer peristome. Fig. 7, portion of inner ditto.—magn. 
