Musci ExorTici.—AHumboldtiani. 
DICRANUM LONGISETUM. 
Dicranum caule subelongato simpliciusculo, foliis falea- 
to-secundis e basi late ovata longe tenuiterque subu- 
lato-setaceis, seta longa, capsula erecta oblonga stri- 
ata, struma nulla, operculo longe subulato. (Tas. 
CXXXIX 
Has. In temperatis regni Novi Granatensis, in sylvis prope Fu- 
sagasaga, alt. 1030 hexap., atque in apricis frigidis montis 
Chimborazo, altit. 2430 hexapod. Humdoldt et Bonpland. 
Caules cexspitosi, subelongati, inferne fibris tomentosis obsiti. 
Folia flavo-viridia, bi- trilinearia, undique inserta, falcato-se- 
cunda, e basi late ovata, longe tenuiterque subulata, setacea, 
subflexuosa, vix apice serrulata, nervo satis angusto. Periche- 
tialia basi lanceolata vaginata. Seta stricta. Capsula erecta, 
ovato-oblonga, flavo-fusea, striata, struma nulla. Operculum 
subulatum, rectum, capsulam longitudine equans, Calypira 
dimidiata, pallide fusca. Peristomium e dentibus 16, infra 
apicem fissis, rufo-fuscis, transversim striatis. 
etn 
There are few genera whose species are so difficult to be distin- 
guished from one another as those of Dicranum. The present 
instance happily affords an exception. The capsule has no stru- 
ma; and this circumstance, together with the general figure of 
the leaves and their direction, indicates some aflinity with D, he- 
teromallum ; but in this the capsule is erect, or very nearly so ; 
and when attentively examined, the leaves, in their great length 
and shape, will furnish sufficient marks of discrimination both 
from that and every other species of the genus. 
_ The habit of the plant is not much unlike some species of Cy- 
nontodium, and the leaves approach those. of C. longirestre, 
though the stems and the fruitstalks are widely different, and our 
species has truly the teeth of a Dicranum. 
Fig. 1, 1, plants, nat. size. Fig. 2, leaves. Fig. 3, capsule 
with operculum. Fig. 4, calyptra, Fig. 5, capsule with the pe- 
ristome, Fig. 6, portion of the peristome.—magn. 
