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ORTHOTRICHUM URCEOLATUM.
Orthotrichum caule repente, ramis erectis, foliis lanceo-
lato-attenuatis dorso carinatis, nervo attingente, seta
sublonge exserta, capsula urceolata lævi, calyptra nuda
sulcata longe multifida. (Tab. CXXIV.)
H a b . In Insula Sanctæ Helenæ. D . Menzies, 1795.
Caules repentes, valde ramosi, ramis numerosis, crassis, brevibus,
apicibus sæpe divisis. Folia nigro-viridia, superiora fusco-viridia,
omnia arcte denseque imbricata, curvato-patentia, siccitate
vix torta, lanceolato-attenuata, acuta, dorso parum carinata,
nervo valido ad apicem attingente instructa. Ferichoe-
tialia bis breviora, acuta, substriata. Seta e caulis innovati-
oiiibus sæpe lateralis, semiunciam longa. Capsula urceolata,
rufo-fusca, lævis, ore contracto. Operculum subulatum, rectum.
Co/t/pi'ra campanulata, nuda, fusco-lutea, sulcata, 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
Ortholrichum prorepcns (Tab. CXX.), were it not for its stouter
branches and nrceolate 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, sulcate, 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, perichætial leaf. Fig. 5,
capsule. Fig. 6, operculum. Fig. 7, calyptra. Fig. 8, portion
of the peristome.—magn.
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