126 BRYOLOGY OF NEW ZEALAND. 
a is sce close se D. rubellus, but it is a quite dintiace species, 
The leaves are much wider in the upper part, oblong-lanceolate, acute with 
a caked: apiculus, the teas is very little recurved, sometimes scarcely 
at all, the denticulation of the apex very irregular, at times very indistinct, 
and h 
the peristome is quite distinct. In D. rubellus it is pale, of sixteen flat, 
faintly papillose teeth, each marked with a median line, but es a pore 
the thin articulations projecting laterally and occasionally connecting the 
teet n D. Binnsii it is dark brown, eac the sixteen teeth divided 
into two quite distinct perfectly filiform, sae rather long crura, strongly 
a 
branched, and unite in a very short basal membrane, scarcely projecting 
above the orifice. 
3. Didymodon lingulatus (H. f. & W.) Bro h. in Engler and Prantl, 
Pflanzenfam., Musci, i, 406. 
Svn. ee igi ds Hot’ W., FEN, 1; Handb. 
NZ. Mi. 4 saoscepetiorae Knightii nee ke ght in 
Trans, N.Z. Inst. vol. 7, p. 354. 
One of the most distinct species of Pottiaceae. in its minute th 
stems consisting of a small brownish bulbil (when dry) of ioe yer 
when moistened are somewhat spreading, very shortly and widely oblong 
lingulate, bronily rounded and obtuse at apex, the nerve ceasing at some 
distance below; the margin narrowly but very variously revolute, at 
times to apex, at others half- -way only, and frequently scarcely at all or 
contents when young, but often quite clear : nd pellucid in older leaves ; 
the basal ee and pellucid, rather thin-walled. The seta is very 
short, about 5mm., the capsule minute, elliptical. Peristome pale brown, 
of sixteen teeth, each more or a completely divided into two rather long, 
filiform crura, finely and densely gob scarcely articulated, and uniting 
at base into a rather high basal mem 
have received it from Mr. Gray, ¢ colle cted in Wairarapa ; it is probably 
widely distributed, but is no doubt easily overlooked owing to its smail 
size. 
A taller form with longer Jeaves and more elongate capsule and lid is 
separated as a variety by Hook. f. & Wilson, and may be worth maintaining 
ig sae r known. 
nostomum Knightii Schimp. belongs here. Both Knight’s plant in 
latus in specimens where they are growing side by side with younger 
capsules having a well-developed peristome, and prove the two to be 
identical; the leaf-characters show no difference. Knight’s eae have 
the leaf-margin more regularly and more fully recurved than occurs 
frequently in D. lingulatus, but this character is unusually variable in this 
species, even on different leaves from the same stem. 
