86 MR. W. MITTEN ON THE MOSSES OF 
3. TRACHYLOMA, Brid. 
* Caulis simplex. 
- Т. subbasilaris. (Hypnum, Hook. Muse. Exot.) 
Hab. Tasmania, Mr. Archer. 
** Caulis dendroideus. 
T. comosa. (Hypnum, Schw.) 
Hab. Tasmania, on stones in rivulets, Cheshunt, Mr. Archer. 
T. arcuata. (Hypnum, Hedw.; H. spininervium, Hook. Musc. Exot.) 
Hab. Tasmania, on the ground, and on stones in the beds of rivulets, 
Cheshunt, Mr. Archer. 
In this species the superior or dorsal series of leaves are smaller 
* than those of the lateral series; but it does not follow that it is to be 
referred to Rhacopilum, аз has been supposed by M. C. Müller; for 
in every other particular, excepting the furrowed capsule, the species of 
this group are remote from that genus. Bridel's genus Trachyloma is 
adopted in preference to the creation of a new one to include the species 
here enumerated and a few others, which, although they do not in all 
respects entirely agree with T. planifolia, yet offer no prominent cha- 
racter whereby they may be distinguished. "The nerve which in the 
cauline leaves of T. planifolia is imperceptible, is distinct in the leaves 
of the ramuli, although very slender. Trachyloma therefore agrees in 
structure with Hypnum, but differs in habit, the branches arising from 
a creeping leafless (?) rhizoma. 
T. AncuEni (Mitten). Dioica, ramis erectis inferne simplicibus sparse 
foliosis superne ramulis patentibus distichis pulchre pinnatis plumi- 
formibus in frondem brevem subtriangularem dispositis, foliis bifarie 
compressis ovato-lanceolatis acutis nervo percurrente dorso apice den- 
ticulato marginibus simplieiter serratis cellulis longitudine circiter 
3$» latitudine 150; uncie metientibus dorso minute papilloso punc- 
tatis, seriebus foliorum in latere dorsali minoribus sed conformibus, 
perichetialibus e basi late ovata tenui acuminatis erectis, theca in 
peduneulo vix unciali horizontali oblonga sulcata, operculo longi- 
curvi-rostrato, peristomio normali. 
Hab. Ovens Creek, Tasmania, Mr. Archer. 
Two or three inches in height, pale yellowish green, shining. Nearly 
allied to T. arcuata; but its branches are more regularly disposed, 
forming a subtriangular frond, and readily distinguished by its minutely 
dotted leaves and short capsule. 
T. Кевви (Mitten). T. arcuate similis, stipite plus minus elongato, 
apice ramis brevibus pinnatis in frondem brevem subrotundatum dense 
confertis, foliis rameis homomorphis ovatis acutis nervo tenui excur- 
rente dorso spinoso dentato mucronatis marginibus superne breviter 
simpliciterque spinoso dentato cellulis angustis elongatis basi flavis 
та 
