Musci Exortic 1.— Menziesiani. 
ieee ee 
LEUCODON CALYCINUS, 
Leucodon caule repente, ramis erectis subsimplicibus, 
foliis ovato-lanceolatis concavis levibus, nervo attin- 
gente, perichzetialibus setam omnino vaginantibus ob- 
tusiusculis enervibus, capsulaobl go-cylindracea cur- 
vata strumosa, ore obliquo, operculo subulato, basi 
gibboso. (Tas. XVII.) 
Has. In sinu Dusky Bay dicto, apud Novam Zeelandiam. D, 
Menzies, 1791. 
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. Sefa lateralis, semiunciam onga. Capsula 
nigro-fusca, exserta, inclinata atque curvata, oblongo-cylin- 
dracea, basi strumosa, ore obliquo. Peristomii dentes 16, 
m 
latum, basi gibbosum. Calypira mitriformis pallide fusca, 
glabra, apice scabra, basi subsexfida. 
Those mosses having 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 
in the Muse. Brit.; but being then acquainted with only one 
species, we subjoined to the character “a dimidiate calyptra,” 
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, J shall suffer it to remain with 
Leucodon; and if during the progress of this little work I see the 
same reason to consider the different form of the calyptra as essen= 
tial in distinguishing genera as I do now, I shall constitute of this 
and of an allied species from New Holland (L. rugosus, MS.) a 
genus under the name of Lyedlia. 
ig. 1, 1, plant mat. size. Fig. 2, leaf. Fig. 3, perichetium, 
capsule, and operculum. Fig. 4, perichetial Jeaf, F ig. 5, inner 
ditto. Fig. 6, capsule, Fig. 7, teeth of peristome. Fig. 8, ca- 
lyptra.—magn, : 
