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ORTHOTRICHUM SWAINSONI.
Orthotríchwn caule repente, ramis erectis, foliis ellipticis
longitudinaliter plicatis, nervo breviter excurrente, seta
longiuscula, capsula ovata lævi, calyptra nuda sulcata
longe multifida. (Tab . CXXVII.)
Hab. Prope Rio Janeiro Americæ meridionalis. D . Swainson.
Caules repentes, ramosi, ramis erectis iterum divisis. Folta nigro
fusca, superiora viridia, dense imbiicata, erecto-patentia,
siccitate torta, elliplica, plicis duabus longitudinalibus, nervo
pallido ultra apicem in apiculo producto. Perichoeiialia minus
plicata, magis membranacea. Se/a semiunciam longa, flexuosa.
Capsula ovata, lævis. Calyptra campanulata, nuda, fusco-lutea,
sulcata, basi ad dimidiam partein longitudinis in segmenta
numerosa angusta fissa. Operculum basi hemisphæricum, apice
acuminatimi. Columella cellulosa longe exserta. Feristomium
simplex, e dentibus longiusculis, albidis, erectis, 16,
linea media longitudinali notatis, ad apicem sæpe fissis.
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This and the subject of the following plate were gathered last
year in the province of Bahia, in the Brazils, by W. Swainson,
Esq. They are remarkable for the structure of the columella,
which is so much exserted beyond the peristome as to present very
much the same appearance as the capsule of Sclotheimia squarrosa,
figured by Schwaegrichen ; nor can I well persuade myself
thatwhat is consideredby that author as a peristome, can in reality
be such, or anything more than a continuation of the columella,
which in a more advanced state may appear cleft.
Fig. 1, plants, nat. size. Fig. 2, portion of a stem and fructification,
Fig. 3, leaf. Fig. 4, apex of ditto. Fig. 5, perichætial
leaf. Fig. 6, peristome and exserted columella. Fig. 7, teeth of
the peristome. Fig. 8, calyptra.—magn.