Musci Exorict.—WMensiesiani. 
TRICHOSTOMUM VAGINATUM. 
Trichostomum caule erecto ramoso, foliis late lanceolatis 
lateribus involutis, perichetialibus longe vaginatis, 
seta elongata, capsula oblonga, operculo subulato. 
(Tas. LXITV.) 
Has. In insula Otaheite, mare Pacifico. D. Menzies, 1792. 
Caules biunciales, erecti, cespitosi, valde ramosi. Folia obscure 
viridia, undique imbricata, patula, late lanceolata, concava, 
integerrima, lateribus insigniter involutis, nervo ad apicem fere 
attingente percursa. Perichetialia circa setam convoluta, 
ext. breviora, apice recurva, subnervosa, int. longissima, act- 
minata, enervia, vaginata. Seta uncialis, flavescens. Cap- 
sula oblonga, cylindracea. Operculum subulatum, capsula 
subzque longum. Calyptra angusta, mitriformis, basi integra. 
Peristomium 16-dentatum, dentibus angustis, flavo-rufescenti- 
bus, transversim striatis, ad basin usque fissis. 
Trichostomum vaginatum has much of the habit of Tortula 
tortuosa, and still more of that of Tr. polyphyllum; but from 
both it differs in the shape of the leaves and in the curious peri- 
chetium, 
Fig. 1, plants nat. size. Fig. 2, leaves. Fig. 3, perichetium. 
Fig. 4, 5, leaves of ditto. Fig. 6, calyptra. Fig. 7, capsule. 
Fig. 8, teeth of peristome.—magn. 
