Musct Exorict.—Menziesiani. 
LEUCODON CALYCINUS. 
Leucodon caule repente, ramis erectis subsimplicibus, 
foliis ovato-lanceolatis concavis leevibus, nervo attin- 
gente, perichetialibus setam omnino vaginantibus ob- 
1% ‘ b Bet ] 
tusiusculis enervibus, capsula oblongo cur- 
vata strumosa, ore obliquo, operculo “dubplates basi 
gibboso. (Tas. XVIL.) 
Has. In sinu Dusky Bay dicto, apud Novam Zeelandiam. D. 
Menzies, 1791. 
Caulis horizontaliter repens, hic illic radiculosus. Rami erecti, 
_ plerumque simplices, teretes, clavati, apice acuti. Folza den- 
sissime imbricata, erecta, ovato-lanceolata, valde concava, ni- 
gro-viridia, nitida, levia, margine integerrima, superne invo- 
luta, nervo ad apicem attingente. Perichetialia notabilia 
in tubum subcylindraceum arcte convoluta, ita magna ut to- 
tam setam includant, ovata, obtusiuscula, enervia, flavo-viridia, 
basi aurantia. Se¢a lateralis, semiunciam longa. apsula 
nigro-fusca, exserta, inclinata atque curvata, oblongo-cylin- 
dracea, basi strumosa, ore obliquo. Peristomi dentes 16, 
tubri, profunde bifidi, transversim striati. Operculum subu- 
latum, basi gibbosum. Calyptra mitriformis pallide fusca, 
glabra, apice scabra, basi subsexfida. 
Those mosses haying the peristome of a Trichostomum or Di- 
dymodon, and lateral fruit, were formed by Schwaegrichen into 
the genus Leucodon. ‘This we adopted with much satisfaction 
which that individual possessed. Here we have a species with 
the same distinguishing marks, except that the calyptra is mitri- 
form. For the present, however, I shall suffer it to remain with 
Leucodon; and if daring the progress of this little work I see the 
same reason to consider the different form of the calyptra as essen- 
i -onstitute of this 
and of an allied species from New Holland (L. rugosus, MS.) a 
genus under the name of Lyellia. 
Fig. 1, 1, plant mat. size. Fig. 2, leaf. Fig. 3, perichetium, 
capsule, and operculum. Fig. 4, perichetial leaf. Fig. 5, inner 
ditto. Fig. 6, capsule. Fig. 7, teeth of peristome. Fig. 8, ca- 
lyptra magn, 
