206 FLORA OF TASMANIA. [Musci, by W. Wilson. 
3. Isothecium pumilum (Hook. fil. et Wils.) ; dioicum, caule dendroideo pinnatim ramoso inferne 
squamoso, ramis complanatis, foliis guadrifariis ovatis vel oblongo-ovatis serrulatis nervo tenui ultra medio, 
pericheetialibus subsguarrosis ovato-ligulatis, seta breviuscula, levi, capsula ovata cernua annulata, operculo 
rostrato.—Neckera (Thamnium) rivalis, Mitten, in Journ. Linn. Soc. ined. (Tas. CLXXV. Fig. 7.) 
Has. On rocks. (Gunn.) On stones and rocks: copse, West End Rivulet and Stackhouse Falls, 
Cheshunt, Archer. 
Thrice as small as I. pandum, Hook. fil. et Wils. Fl. N. Zeal. p. 105. t. 89. f. 1—Zeaves more evidently serrate, 
with a short, very faint nerve. Siem 1 inch. Seta scarcely + inch. Operculum as long as the capsule. Peristome 
double; outer teeth pale yellow.—PrtATE CLXXV. Fig. 7; 1, part of stem and leaves; 2, leaf; 3, pericheetium 
and capsule, etc. :—all magnified. : 
$ 2. HYPNODENDRON.—Rami in frondem horizontalem deltoideo-subrotundam dispositi. Innovationes e 
basi frondis orti. Capsula striata. 
4. Isothecium spininervium (Hypnum, Hook. Musc. Exot. t. 29); dioicum, comosum, ramis 
simplicibus complanatis, foliis appresso-patulis subdistiche imbricatis ovatis acutis margine dorsoque ser- 
ratis solidinerviis, capsula oblonga sulcata cernua, operculo rostrato capsula breviore.—Schwegr. Suppl. 
t: 958. Trachyloma arcuatum, Mitten, in Journ. Linn. Soc. ined. 
Has. In woods, rare. Back River Gully, New Norfolk. (Gunn.) (J. D.H.) (Oldfield, 65.) On 
the ground, and on stones in the bed of rivulets : Cheshunt, Archer: 
Distris. New Zealand, Australia. 
5. Isothecium Archeri (Mitten); “ dioicum, ramis erectis inferne simplicibus sparse foliosis superne 
pulchre pinnatis plumiformibus, ramulis patentibus distichis in frondem brevem subtriangularem dispositis, 
foliis bifarie compressis ovato-lanceolatis acutis nervo percurrente, dorso apice denticulato, marginibus sim- 
pliciter serratis, cellulis longitudine circiter +35 latitudine ++ unc. metientibus dorso minute papilloso- 
punctatis, seriebus foliorum in latere dorsali minoribus sed conformibus, perich:etialibus e basi late ovata 
tenui acuminatis erectis, theca in pedunculo vix unciali horizontalis oblonga sulcata, operculo longi-curvi- 
rostrato, peristomio normale."—Trachyl Archeri, Mitten, in Journ. Linn. Soc. ined. (Tas. CLXXV. 
Fig. 8.) 
Has. Ovens Creek, Cheshunt, Archer. 
Two or three inches in height, pale yellowish-green, shining. Nearly allied to H. arcuatum, Hedw., but its 
branches are more regularly disposed, forming a subtriangular frond, and readily distinguished by its minutely 
dotted leaves and short capsule. Mitten, l. c. —Pr.ATE CLXXV. Fig. 8; 1, leaf; 2, ditto of perichzetium ; 3, cap- 
sule :—all magnified. 
6. Isothecium comosum (Labill. Pl. Nov. Holl. ii. 107. t. 253. f. 2); dioicum, dense cespitosum, 
caule tomentoso apice comoso, ramis subverticillatis brevibus densis suberectis, foliis patentibus subsecundis 
rigidis e basi subauriculata ovato-lanceolata subito acuminatis apice serrulatis nervo crasso solido tereti 
dorso levi excurrente setaceis, pericheetialibus longioribus erectis, capsula in pedunculo mediocri pendula 
oblonga sulcata, operculo longirostri.—Bridel, Bryol. Univ. ii. 374. Hypnum comosum, Schwegr. Suppl. 
t. 91. 
Has. Tasmania. (Barren specimens only.) (Gunn.) 
Disrris. New Zealand, Lord Auckland's Islands. 
7. Isothecium Sieberi (Hypnum, C. Mueller, Muse, Syn. ii. 504); dioicum, laxe ceespitosum, 
caule robusto tomentoso apice lateraliter (nec verticillatim) comoso, ramis crassis curvatis cirrhatis apice 
