M uscr ExoTict.—wMenziesiani. 
ORTHOTRICHUM GRACILE. 
Orthotrichum caule erecto elongato ramoso, foliis lan- 
ceolato-subulatis flexuosis, siccitate tortis, seta bre- 
viuscula, capsula ovata glabra, calyptra glabra multi- 
fida, ciliis nullis, dentibus 16 vix per paria approxi- 
matis. (Tas. X XVII.) 
Has. In sinu Dusky Bay dicto, in Nova Zeelandia. D. Mene. 
wies, 1791. 
Caules 3-4-unciales, graciles, flexuosi, ramosi, ramis sparsis ple- 
rumque simplicibus, Folia luteo-fusca, laxe patentia, lanceo- 
lato-subulata, flexuosa, carinata, nervo ad apicem attingente 
instructa. Perichetialia planiuscula, substriata. Sete ter- 
minales, demum, ob caulis innovationes, laterales, bi-~ tri-line- 
ares, flexuose. Capsula ovata, fusca, levis. Operculum su- 
bulatum, capsula subeque longa. Calyptra intense fusca, gla- 
bra, striata, multifida, segmentis longis linearibus. Peristo- 
mium simplex, dentibus 16 vix per paria approximatis, pallide 
flavis, linea media longitudinali notatis, transversim striatis. 
i. en 
Orthotrichum gracile has at first sight, not only in its leaves 
but even in the fruitstalk and capsule, the aspect of Trichostomum 
patens; the calyptra, however, and the teeth prove it to be of 
the same family with our. O. longirostrum and longipes. From 
‘those it differs in its long stem, proliferous branches, which give 
the fruit so often the appearance of being lateral, and especially 
in the long narrow and flexuose leaves. 
Fig. 1, plants nat. size. Fig. 2, leaf. Fig. 3, point of ditto, 
Fig. 4, perichetial leaf. Fig. 5, fruitstalk and capsule, Fig. 6, 
teeth of peristome. Fig. 7, operculum,—magn. 
