150 BRYOLOGY OF NEW ZEALAND. 
T. princeps varies greatly in size, and to some extent in the length and 
roughness of the arista, the degree of recurving of the margin, of the 
all the leaves on a single stem, so that I must confess to some inability to 
see why this particular plant has been subjected to so much “ splitting ” 
as compared with many other much more variable species. 
i the species of Brown’s cited above as synonyms occur in his herb- 
arium, and present no differences from T. princeps except in size and one 
or two quite minor characters. 
Rodway (Tasmanian Bryophyta, Mosses, p. 16) cites 7. speek bess 
Hpe. & C. M. as a synonym of ° rinceps. An examination ’s 
material at the British Museum would have led me to the same seomelusion 
more than one _— of this group may, like the European 7. laevipila, 
have a gemmiparous form, in which case—since no dioicous species of this 
group appear to ae found in New Zealand—it would be natural to suppose 
that the New Zealand plants in question represented a gemmiparous form 
) princeps, while T'. pandurifolia was a similar form of one or the 
other allied dioicous Australian species. 
T. princeps is known at once from the other New Zealand species by its 
synoicous or autoicous inflorescence, widely spathulate, obtuse leaves, 
with the red nerve excurrent in a long, more or less denticulate, hyaline 
arista. It appears to be common, and, like the European plant, is very 
variable in size and habit. 
§ Tortula sensu stricto Limpr.—continued. 
(The followmg species was determined too late to be placed in its 
proper sequence.) 
14. Tortula abruptinervis Dixon sp. nov. [Plate VIII, fig. 6.] 
erminuta ; caespites densissimas virides parvas formans; caules 
2-3 mm. tantum alti, hic illic parce ramosi. Folia conferta, exit pata 
sicca arcte nee sree nervo pallido dorso valde nitente; minima, 
om ingulata, apud medium paullo angustata, dehine supra 
pill dilatata ‘subspathulata, apice late rotundato-obtusa ; marginibus 
planis. Costa valida, fusca, superne nullo modo angustata, apicem versus 
carinata, dorso — lacvis. in mucronem brevem, crassum, truncatum, 
nullo modo tum, excurrens; sectione supra duces 2 medianos, 
comitum eiarn ulum parvum, oatlutia espe oe homogeneas, 
fuscas, ventrales paucas majores papillosas 
ulae superiores majusculae, 10-14 Ue Fatindiad chlorophyllosae, 
papillis bi-trifidis praecipue ad marginem coronatae. Areolatio basilaris 
pellucida, cellulis medianis hyalinis, rectangularibus, ad marginem seriebus 
3-4 brevioribus, subquadratis, weigy oto 
opagula numerosa, magna, folio: axillis sita, eis 7. pagoru 
oni simillima, 250 » ‘longa vel ‘ilies Susiformia, perviridia, apice sis, 
Frocks ignotus. 
