POTTIACEAE. 125 
twisted to the right,* united below in a very short basal membrane; the 
cells of the lid are also erect or slightly inclined to the right (as viewed from 
within). 
: a TO THE SPECIES. 
1, {Leaves denticulate at apex, poin 2 ¥ te Ee 2 
| Leaves entire, nerve ceasing Shear wie obtuse apex < =a a 3 
Leaves linear above, margin recurved to near a 1. rubellus. 
2. {Leaves widely oblong-lanceolate, margin slightly i wediiread only near base 
2. Binnsii. 
{ Plant minute, leaves shortly and very widely lingulate ae .. 3. lingulatus 
3. {Plant larger, leaves narrowly lingulate from a broader base .. -. 4. calycinus. 
1. Didymodon rubellus (Hoffm.), Bry. eur., fasc. 29-30, p. 3. 
Syn. Bryum rubellum Hoftm., Deutschl. he ii, 33 (1796). Barbula 
rubella Lindb., Muse. Scand. - 22 (1879). Didymodon erubescens 
Mitt. » Handb. N.Z. F1., 421. Trichostomum curvithecum 
R. er. in Trans. N.Z. Foti vol. 29, p. 487. 
I have given aay a small part of the synonymy of this, early-known 
species, which has hitherto not been recognized as a New Zealand plant. 
Examination of Mitten’s D. erubescens at Kew Jeaves no doubt, however, 
of its identity with the northern species, with which it agrees in every 
: aan a Seen, 
the form which has been described as var. dentata, having a rather juxuriant 
habit, longer lid, leaves rather more sharply toothed at Soe and the 
recurving of margin ceasing some way below apex. e characters are, 
however, quantitative rather than qualitative, and it is sith “difficult to 
define as a variety. The species has been known for some time from 
Tasmania, so that its recognition as a New Zealand species is not at all 
une xpec 
s Tr. curvithecum is shown by his specimen to belong to 
R. Bro 
D. sidicdiise os is the type form, with leaf-margin recurved to apex, and - 
with the shortly rostellate lid of that form. 
The plant is readily recognized by alw a exhibiting some trace of 
rusty red in the lower part; the leaves are narrowly lingulate above (but 
variable in width), and somewhat reflexed from a wider amplexicaul base 
crowned with a smooth, pellucid acute apiculus, on each side of whic 
are usually two or three more or less conspicuous denticulations. 
capsule is frequently curved, narrowly se dooniowe the peristome-teeth pale 
and short. Inflorescence synoicous or paro 
It appears to have been found only in the South Island at present. 
o 
2. Didymodon Binnsii (R. Br. ter.) Dixon comb. nov. 
Syn. Trichostomum Binnsii R. Br. ter. in Trans. N.Z. Inst., vol. 29, 
 -p. 486, t. 43 (1896). 
I know of no other locality than that where Brown collected it—on 
damp rocks, Port Lyttelton Hills, in 1888; it is probably rare. Its 
* See note on p. 145. 
