﻿MOSSES FROM MiTTEN's HERBARIUM 101 



short, so that the capsule is scarcely emergent. Too much stress 

 must therefore not be placed on the exact length of the seta ; and 

 for this reason I consider inseparable from M. erosulum the plant 

 of T. W. Naylor Beckett's to which Brotherus has given the manu- 

 script name of M. per papillosum. I can find no difference between 

 this and Mitten's M. erosulum in the leaves or fruit, only the seta 

 is longer than usual, ranging from 2 to 4 cm. on one tuft, and 

 from 2.5 to 5 cm. on another. 



Macromitrium (Eu-macromitrium, Goniostoma) Petriei 



Dixon, sp. nov. 



Plate 9, figure 7 



Sat robustum; caulis elongatus, ramis erectis, graciliusculis , 

 substrictis, elongatis (ad 2 cm.), simplicibus vel hie illic divisis; 

 folia pro more laxiuscula, suherecta substricta, siccitate arete erecto- 

 appressa, apice tantum circinato-incurva, 2-2.5 niiri- longa, e basi 

 elongata elliptica lanceolata, sensim acutata, apice plerumque 

 acuta, saepius mucronata, marginibus planis vel irregulariter 

 reflexis, argute eroso-papillosis. Cellulae pellucidae, baud in- 

 crassatae, 8-14 n latae, eis M. erosuli similes. Perichaetialia 

 parva, subsimilia. Seta i cm. vel pauUo ultra, theca elliptica 

 brevicolla, 2 mm. longa, operculo subulirostro aequilongo. Calyp- 

 tra longipilosa. Spori valde inaequales, interdum ad 50 n lati, 

 papillosi. Dentes peristomii breviusculi, fusci, densissime papil- 

 losi, opaci. 



Habitat: Clinton Valley, Te Anau, New Zealand, D. Petrie. 



Although in leaf-structure this is scarcely separable from M. 

 erosulum (the leaves however are longer and more acute than is 

 usually at least the case there), the long straight branches, rather 

 slender on account of the less dense foliation, and the leaves sub- 

 erect, not spreading when moist and closely appressed except at 

 the points when dry seem to entitle it to specific rank. Both M. 

 prorepens and M. erosulum vary very considerably in size and 

 habit and length of branches, but I have seen nothing among them 

 which seems to approach the present plant, and I think it must 

 deserve specific rank. It bears a much closer resemblance to M- 

 rigescens Broth. & Dixon, a gymnostomous species; in fact it 

 occupies almost exactly the same relationship to M. erosulum 

 as M. rigescens does to M. grossirete; Mr. Petrie's plant only 



