36 BRYOLOGY OF NEW ZEALAND. 
Further, under 7. suberectus he writes, “from the nearly allied 7. arcuatus 
distinguished by the erect, scarcely twisted, only faintly strumose neck, an 
the entire basal part of the leaves.’ As the leaves in T. arcuatus are de- 
scribed later on as “ entire or indistinctly denticulate,” this latter character 
can have no great weight, and the difference between the two resolves itself 
practically into that first noted by Mitten—viz., the sane of the capsule 
nearly straight, scarcely twisted, and 1} times as long as the capsule in 
T. suberectus, as against an equal or only ‘slightly longer, si twisted neck 
in 7. arcuatus, with—according to Roth—a more distinct struma. 
figures given by Roth of the two plants indicate what very slight differences 
he finds between them, and even these slight differences I do not ee borne 
out by the specimens in my herbarium. us my specimens of JT. sub- 
seat (near Auckland, leg. D. Petrie, det. Brotherus), the same plant 
without doubt as that figured by Roth, while showing the capsule neck 
usually only indistinctly strumose, has in the few more mature sporophytes 
a struma quite as distinct as in normal arcwatus, while the neck, though 
constantly longer than the capsule, is by no means always 1} times its 
length, and, in fact, scarcely a at all in this respect from what i is often 
. found in Tf. eee In my opinion, 7’. arcuatus, therefore, is but a slightly 
more robust form of 7. daboreais. with both capsule and neck longer and 
slightly “sco  develbped. 
T. Jonesii R. Br., MS. in herb., is also inseparable from 7’. arcuatus, and 
is therefore referable here. It appears not to have been published. 
T. integrifolius C. M. is quite indistinguishable from the smaller forms 
of T. suberectus. 1 have examine e type in C. Miiller’s herbarium 
t. Sentdes ground, Marlborough, Kaikoura, Dec., 1889, T. W. Naylor 
tt.”), which is a small plant with small, suberect capsules, nk a 
the name of 7. flexipes Mitt. (“ Road skirting the sea, Mangamanga Bay, 
Kaikoura, 6 Dec., 1889”), is most probably the same plant. It has capsules 
inclined, and with a ‘distinct aperaeeagt ot pronounced struma, exactl 
normal 7. suberectus. All the other characters of ‘nero Naini 
peristome, spores, &c.) agree exactly with T. suberect 
3 inflorescence in 7’, suberectus appears to a sometimes on a short 
basal branch, sometimes on a separate but closely connected plant (i.e., 
rhizautoicous), which probably sufficiently explains the fact that T. integri- 
folius is described as autoicous, and T. swberectus as dioicous. 
Prevripium Brid, (Astomum Hampe, p.p.). 
Pleuridium is divided by Posner: sg three subgenera—Pseude- 
phemerum, Eupleuridium, and Sclerasto penne merum is not re- 
presented | in New Zealand. The Rccecans between Eupleuridium and 
Sclerastom 
. um do not appear to me to be sufficiently mei defined or important 
to be of taxonomic value, nor are they of any great aid in the classification 
of specimens. Thus Pleuridiwm gracilentwm Mitt. is placed by Roth under 
Eupleuridium and by C. Miller under Sclerastomum, while of P. nervosum 
and other species Roth remarks that they appea r to show a. gradation 
between the two. I have therefore not retained this division. 
