Musci Exorict.—Swainsoniani. 
ORTHOTRICHUM SWAINSONI. 
Orthotrichum caule repente, ramis erectis, foliis ellipticis 
longitudinaliter plicatis, nervo breviter excurrente, seta 
longiuscula, capsula ovata levi, calyptra nuda sulcata 
longe multifida. (Tas. CXXVIL.) 
Has. Prope Rio Janeiro Americe meridionalis, D. Swainson. 
Caules repentes, ramosi, ramis erectis iterum divisis. Folia ni- 
gro-fusca, superiora viridia, dense imbricata, erecto-patentia, 
siccitate torta, elliptica, plicis duabus longitudinalibus, nervo 
pallido ultra apicem in apiculo producto, Perichetialia minus 
plicata, magis membranacea. Se¢a semiunciam longa, flexuosa. 
Capsula ovata, levis. Calyptra campanulata, nuda, fusco-lu- 
tea, sulcata, basi ad dimidiam _— a in Secgeanta 
, apice 
numerosa angusta fissa. Op 
acuminatum. Columella cellulosa longe exits: Peristo- 
mium simplex, e dentibus longiusculis, albidis, erectis, 16, 
linea media longitudinali notatis, ad apicem sepe fissis. 
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 squar- 
rosa, figured by Schwaegrichen ; nor can I well persuade myself 
that what is considered by 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, maf. size. Fig. 2, portion of a stem and fructi- 
fication. Fig. 3, leaf. Fig. 4, apex of ditto. Fig. 5, perichetial 
leaf. Fig.6, peristome and exserted columella, Fig. 7, teeth of 
the peristome. Fig. 8, calyptra.—magn. 
