122 BRYOLOGY OF NEW ZEALAND. 
Tripontium Hook. f. 
Tridontium tasmanicum Hook. f., Ic. pl. rar., ii, t. 148 (1841); FI. 
N.Z., ui, 65. 
Syn. Dicranum tasmanicum Hook. f., Handb. N.Z. Fl., p. 410. 
Didymodon tasmanicus Mitt. in Journ. Linn. Soc., iv, 70 (1859). 
Dicranum rostratum R. Br. ter. in Trans. N.Z. Inst., vol. 29, 
p. 458. Cinelidotus australis Dixon in Bull. Torr. Bot. Club, 
42, p. 96 (1915). : 
. G. Webster sterile plants which must be referred here, from Gippsland, 
Victoria (coll. Rev. W. Bennett) ; while it is also recorded by W. W. Watts 
from New South Wales. 
The only moss likely to be confused with it is Zucladium irroratum. This 
has more than once been labelled “ 7’. tasmanicum var. angustatum,” and 
a plant collected by Mr. D. Petrie at bottom of creeks, Kaitangata, Otago. — 
I find, unfortunately, that this must be considered a submerged form of 
Tridontium tasmanicum. The corkscrew-like twisting of the leaves when 
dry—a marked feature in some of our northern aquatic species of Cincl- 
dotus, but the leaf-structure, remarkable as it is, is precisely that of the 
but in examining Tridontium for the purposes of this paper I became aware 
that they are normal features in its leaves, and there is no doubt that 
Mr. Petrie’s plant must be referred here, and the genus Cinclidotus expunged 
from the New Zealand Flora. 
Tortexyia (C. M.) Limpr. 
This genus was created to contain certain species of Barbula or Tortula, 
sometimes also included in Trichostomum, which may roughly be described 
as having the foliage of Trichostomum with the peristome of Barbula ; the 
