98 BRYOLOGY OF NEW ZEALAND. 
var. majus, are sometimes extremely small; the leaves in these forms tend 
to have the apex rough at the back in a greater degree than the taller, 
longer-leaved ones. 
I have examined the types of C. Miiller’s new species given in the 
synonymy above; they all appear to me inseparable from one or other of 
_ the forms of L. candidum. L. interruptum C. M. (Neu Seeland, leg. Helms, 
1886) is oy a form with the leaves more than usually rugose at back 
above; I have Laie similar and intergrading forms from New Zealand. 
L. spinidorswm C. M. (Tasmania, leg. Weymouth, 1889) is a form Mies broad, 
short leaves, highly rugose at pack, but scarcely more so than in forms in 
my herbarium with normally shaped leaves, and quite tenia in leaf- 
section. 
FISSIDENTACEHAE. : 
Fisstipens Hedw., Fund. ii, p. 91 (1782). 
According to Brotherus’s see Ee es following closely on C. ae 8, 
this large genus of more than 600 species falls into four subgenera, one 
(Pachy fissidens) being riche pie betats in the ‘Tabane’ of the others, Bisidens, 
containing the bulk of the dager is divided into 12 sections. As thes 
divisions are for the an part not only natural ones but at the same dine 
of considerable practical value in hk determination of species, I give here 
a brief summary of the characters of those groups represented in New 
Zealand. 
Subgen. I. Potypopropsis C. M.—Small a venal mosses. Stem-tissue 
lax, without central strand. Leaves flaccid, narrowly bordered. Nerve 
failing ; leaf-cells lax. Seta terminal. Calyptra conical, usually entire at 
Be FP dealbatus H. £2 & W. 
Subgen. II. Evrisstpens Mitt.—Plants of varying size. Stem with 
central strand. Nerve present; border present or absent. Cells mostly 
small, more or less isodiametrical, rarely larger ol prosenchymatous. 
Seta mostly ee Calyptra usually cucullate, rarely entire. 
§ Bryoidium C. M.—Small, mostly bright green terrestrial, rarely rupes- 
tral mosses. Leaves bordered throughout, border not thickened, often 
famt above.. Cells small, hexagonal, thin-walled, more or less pellucid, 
tarely obscure. Seta nearly always terminal. Branches of peristome-teeth 
spirally thickened. 
F. inclinabilis C. M. 
F.. campyloneurus e x & Beck. 
F. soe lien Dix 
* F. gonioneurus C. iM. 
§ Pachylomidium C. M.—Plants more robust, usually calcicolous water- 
plants. Leaves bordered throughout ; border stout, thickened. Cells, seta, 
&c., as in Bryoidium 
ft igidulus 4, te Ws 
Heterocaulon C. M.—Very small terrestrial plants. Stems dimorphous ; 
sterile stems with minute leaves, having the dorsal lamina almost or quite 
undeveloped ; fertile stems shorter, with care leaves, dorsal lamina 
developed, but ceasing far above the base of the leaf. Border only on 
the vaginant lamina. “Cells, &c., as in aac 
F. Taylori C. M. 
