Musctr Exorrict.—Swainsoniani. 
HOOKERIA LANGSDORFFII. 
Flookeria caule elongato repente vage ramoso, foliis di- 
stichis compressis ovatis subacuminatis membranaceis 
submarginatis apice serratis, nervis duobus ante apicem 
evanescentibus, capsula ovata cernua, operculo hemi- 
spherico rostrato, calyptra basi 6-fida. (Tas. CXXI.) 
Has. Prope Rio Janeiro Brazilie legit Cl. Langsdorff ; com- 
municavit D. Swainson. 
zontaliter cernua, demum pendula, fusca. Operculum rostra- 
tum, basi hemisphzricum, rostro longiusculo curvato. Calyptr 
mitreformis, pallide fusca, levis, basi breviter 6- vel S-fida; su- 
_ perficies hic illic corpora pistilliformia gerens. istomium 
Leskee, dentibus ext, intense fuscis, linea media longitudinali 
diaphana notatis. 
For this, as well as some other interesting Mosses and Lichens, 
I am indebted to my friend W. Swainson, Esq. of Elm-Grove, 
near Liverpool, who, in a journey which he lately made into the 
interior of the Brazils, kindly exerted himself in procuring crypto~ 
gamic plants for me. The subject here represented h : 
resemblance to Hookeria (Leskea, Hedw.) albicans, but in the 
texture of the leaves is totally different. It also approaches Hook. 
(Lesk. Hedw.) depressa, but that again has the leaves imbricated 
on all sides. Our plant is also very much larger than either of 
those, and may be reckoned among the handsomest individuals of 
the genus. Hookeria lete-virens may be distinguished from it 
by the size, and more essentially by the reticulation of the leaves, 
their want of a thickened margin, and their nearly entire apices ; 
and also in the form and texture of the calyptra. 
aps 
the operculum. Fig. 7, portion of the outer peristome, Fig. 8, 
portion of inner ditto. Fig. 9, calyptra.—magn. 
Vot. II, 
