Musct Exorict.—Humboldtiani. 
GRIMMIA LONGIROSTRIS. 
Grimmia caule erecto cespitoso, foliis undique erecto- 
patentibus lanceolatis longe acuminatis incanis, seta 
exserta recta, capsula ovata, operculo longe rostrato. 
(Tas. LXII.) 
Has. Locis scopulosis, apricis, in declivitate montis Chimborazo, 
altit. 2380 hexapod. super porphyrite. (Regnum Quitense.) 
Humboldt et Bonpland. 
Caules dense cxspitosi, erecti, versus apicem subramosi. Folia 
undique denseque imbricati, erecto-patentia, nigro-viridia, su- 
perne flavescentia, concava, lanceolata, in pilum longum dia- 
phanum subserrulatum attenuata, nervo evanescente instructa. 
Seta vix semiunciam longa, erecta. Capsula ovata, vel ob- 
longo-ovata, erecta, levis, ore annulato. Calypira mitriformis, 
basi subquinquefida, rarius lateraliter fissa (f.6). Operculum 
subulatum, rectum, capsula paulo brevius. Peristomii dentes 
16, lanceolati, integri, transversim striati, flavo-rubri. 
It must be confessed that this moss comes very near to our 
Grimmia ovata, though it is of a much larger size, and altoge- 
ther of a stouter habit. The main difference between them must 
however rest on ‘the length of the operculum, which in the pre- 
sent plant is full three fourths of the length of its capsule. The 
calyptra, though a truly mitriform one, is sometimes seen to be 
so cleft on one side that it assumes the appearance of being di- 
midiate. 
Fig. 1, tuft of plants nat. size, Fig. 2, single plant. Fig. 3, 
leaves. Fig. 4, calyptre. Fig.5, portion of a capsule, showing 
the annulus, Fig.6, operculum, Fig. 7, teeth of the peri- 
Stone. 
