86 Mil. W. MITTEN ON THE MOSSES OF 



* Caulis simplex. 

 T. subbasilaris. (Hypnum, Hook. Muse. Exot.) 

 Hab. Tasmania, Mr. Archer. 



** Caidis dendroidem. 

 T. comosa. (Ilypnum, Schw.) 

 Hab. Tasmania, on stones in rivulets, Cheshunt, Mr. Archer. 



T. arcuata. (Hypnum, Hedw. ; H. spininervium, Hook. Muse. 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, as has been supposed by M. C. Miiller ; 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. Archeri {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 simpliciter serratis cellulis longitudine circiter 

 3^ latitudine 40V7 uncise metientibus dorso minute papilloso punc- 

 tatis, seriebus foliorum in latere dorsali minoribus sed conformibus, 

 perichsetialibus e basi late ovata tenui acuminatis erectis, theca in 

 pedunculo vix unciali horizontali oblonga sulcata, operculo longi- 

 curvi-rostrato, peristomio normal! . 



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. Kerrii (Mitten). T. arcuata 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 



