Musct Exortic1.—Menvziesiani. 
ORTHOTRICHUM URCEOLATUM. 
Orthotrichum caule repente, ramis erectis, foliis lanceo- 
lato-attenuatis dorso carinatis, nervo attingente, seta 
sublonge exserta, capsula urceolata levi, calyptra nuda 
sulcata longe multifida. (Tas. CXXIV.) 
Has. In Insula Sancte Helene. D. Menzies, 1795. 
Caules repentes, valde ramosi, ramis numerosis, crassis, brevibus, 
apicibus sepe divisis. Folia nigro-viridia, superiora fusco-vi- 
ridia, omnia arcte denseque imbricata, curvato-patentia, sic- 
citate vix torta, lanceolato-attenuata, acuta, dorso parum ca- 
rinata, nervo valido ad apicem attingente instructa. Periche- 
tialia his breviora, acuta, substriata. Seta e caulis innovati- 
onibus sepe lateralis, semiunciam longa. Capsula urceolata, 
rufo-fusca, levis, ore contracto. Opexculum subulatum, rec- 
tum. Calypira campanulata, nuda, fusco-lutea, suleata, basi 
ad dimidiam partem longitudinis in segmenta 8-10 angusta 
fissa. Peristomium, ut videtur, simplex, e dentibus pallidis, 
brevibus, integris, linea longitudinali_ media notatis, non raro 
apice fissis, 
At first sight it might be difficult to distinguish this plant from 
Orthotrichum prorepens (Tan, CXX.), were it not for its stouter 
branches and urceolate capsules. The leaves of the two species 
are also much alike, but shorter and more acute in all that I could 
find entire upon the present subject ; for it is remarkable, that 
though the specimens in my possession are in other respects very 
good, it was difficult to discover a single leaf of which the point 
was not broken, The essential differences must be looked for in 
the calyptra, which is here naked, suleate, and deeply cleft from 
the base upwards into a number of linear segments, 
Fig. 1, 1, plants, nat. size. Fig. 2, portion of a stem with 
fructification, Fig. 3, leaf, Fig. 4, pericheetial leaf. Fig. 5, 
capsule, Fig. 6, operculum, F ig. 7, calyptra, Fig. 8, portion 
of the peristome.—magn, 
