OF THE FORTY-NJXTH PAEALLEL OP LATITUDE. 49 



Some of the specimens from N.TV. America are very large, 

 with the leaves spreading and recurved, and the capsule erect 

 and elongate, but there appears to be no real difference excepting 

 the external appearance. * 



Besides the P. contortum, Menzies, collected by himself in 

 N.W. America, there are in Herb. Hooker, some specimens, not 

 in a very good state, of what appears to be another species, more 

 nearly allied to P. ctloides. 



P. atrovirens, sp. nov. Caule simplici elongato, foliis patentibus 

 siccitate incurvis subcrispatis e basi latiore cauli appressa late lanceo- 

 latis acutis marginibus fere a basi ad apicem serratis nervo dorso 

 dentato pagina superiore partis folii lanceolatis lamellis fere tota ob- 

 tecta, tbeca in pedunculo unciali oblonga erecta, operculo convexo 

 brevirostro. 



Hab. Sitka, Barclay. 



About three inches high, blackish brown. Foliage softer than 

 in P. aloides, the base with larger cells, the margins serrate 

 almost to the very base. 



P.. contortum differs from this in its leaves being more nearly 

 lanceolate throughout, not sheathing below, and the areolation at 

 the base nearly the same as on the upper part, where they are 

 more gradually narrowed into the point. 



POLTTKICHADELPHUS, C. Mllller. 



P. Lyallii, sp. nov. Caule brevi breviter fastigiatim ramoso inferne 

 subnudo superne, foliis e basi oblonga latiore erectiore amplexante 

 lanceolatis patentibus sensim acutis lamellis obtectis marginibus e 

 medio ad apicem serratis incurvis dorso convexis laevibus aut in superi- 

 oribus paucidentatis, perichaetialibus internis basi longioribus con- 

 volutis apicibus bevioribus, theca in pedunculo elongato flexuoso rubro 

 suboblonga inferne ventricosa inclinata setate horizontali supra bi- 

 plicata spatio intermedio concava infra irregulari convexa basi apo- 

 physe plicata rugosa brevi sub ore contracto, operculo subuli-curvi- 

 rostrato, calyptra pilis paucis brevibus appressis. 



Hab. In swampy places on the east side of the Cascade Mountains, 

 British Columbia, at an elevation of 7000 feet, July 1860, Lyall. 



All the specimens agree in their short stems, rarely simple, 

 with a single perichsetimn, but branched in a close fastigiate 

 manner, so that at first sight the stems have the appearance of 

 bearing a number of setae from nearly the same point ; on ex- 

 amination, however, each seta is found to be terminal on its own 

 proper branch, and of these as many as nine have been observed 



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