Musci Exorici.—AHunboldtiani. 
DICRANUM DENSUM. 
Diei le simplici lo, foliis lanceolato-subulatis 
integerrimis, nervo tenui, capsula ovata inclinata levi 
absque struma, operculo longe rostrato curvato. (‘TaB. 
x3.) 
Has. In crepidinibus montis Quindiu, regione temperata. Hum- 
boldt et Bonpland. 
Caules densissime cespitosi, semiunciales, erecti, subsimplices, 
inferne tomento fusco obsiti. Folia pallide viridia, undique 
imbricata, e basi late lanceolata, subulata, planiuscula, inte- 
gerrima, nervo satis tenui et ad apicem attingente instructa. 
Substantia tenera, reticulata. Se/a solitaria, semiuncialis. 
Capsula ovata erecta vel lenissime inclinata fusca, absque 
struma sed ad basin paululum contracta, levis. Operculum 
subulatum, curvatum, capsula concolor, ejusdem Iongitudine. 
Annulus simplex. Calyptra dimidiata. Peristomii dentes 16, 
rufi, satis magni, transversim striati, ad dimidium et ultra lon- 
gitudinem fissi, 
a 
Notwithstanding that the peristome of this moss prove it to be 
a true Dicranum, the natural habit of the plant has a great si- 
milarity to Weissia acuta of Hedwig; insomuch that without 
having recourse to a microscope—when the leaves will be found 
to differ both in form and texture—they will not readily be distin- 
guished. In the genus to which it belongs, I know of no species 
with which it is likely tobe confounded except D. cerviculatum, 
which, however, has an evident struma, much more subulate 
leaves, and a remarkably broad nerve, 
Fig. 1, tufts of plants, nat. size. Fig. 2, single plant. Fig. 3, 
leaves. Fig. 4, capsule with its annulus and peristome. Fig.5, 
operculum, Fig. 6, teeth of the peristome.—magn, 
