110 ON NEW MOSSES. 



TETRODONTIUM, Schwcey. 



T. REPANDUM, Funk. 



Hal. On damp ground, near the "Glen House," Gorham, White Mountains, New Hampshire. Very rare. 



ENCALYPTA, Schreb. 

 E. STREPTOCARPA, Hedw. 

 Halt. Alleghany Mountains, Lancaster County, Pennsylvania, and Falls of Niagara ; sterile. 



ZYGODON, Hook, and TayL 

 Z. LAPPONICUS, Br. and Sch. 



Hal. Crevices of rocks, Crawford Notch, New Hampshire; near the Wissahickon Creek, Philadelphia, also 

 Mercersburg, Pennsylvania, Porter. 



Z. MouOEOTII, Br. and Sch. 



Hub. Catskill Mountains, New York; Crawford Notch, New Hampshire; and near the Wissahickon Creek, 

 Philadelphia, Pennsylvania. 



ORTHOTRICHUM, Hedw. 



O. OBTUSIFOLIUM. Var. Lesqx., 0. Rogeri, Milll., nee Schp. 



Hab. On trunks of Lombardy poplar trees, Cambridge, Massachusetts ; in similar situations near Philadelphia, 

 Pennsylvania. 



O. PUMILUM, Br. and Sch. 



Sab. On trees, near Philadelphia, Pennsylvania; Camden, New Jersey; and Cambridge, Massachusetts. 



0. PSILOCARPUM, sp. nov. (Mss., 1858), Monoicum, dense pulvinatum, pusillum, parce diohotornum, arncene 

 viride, Foliis erecto-appressis, madefactis apertis, ovato-lanceolatis, concavis vix carinatis, margine medio 

 revolutis, apice obtusis vel obtuso-acutis, nervo valido sub apice evanido instructis, areolatione cellulis ovatis 

 chlorophyllosis distinctis utrinque inflatis, vix vel minutissime papillosis, basim versus subquadratis, peri- 

 chsetialibus conformibus sed longioribus ; theca immersa, ovata, ore angusto, laevi (leptoderma leioder- 

 maque) vacua amosne pallida, collo elongate, in vaginula ineunte. Peristomii duplicis dentibus externis, 

 brevibus, erectis, sordide albidis, granulosis, margine irregularibus, lanceolatis obtusis vel apice erosis 

 obscure articulatis. Ciliis internis 8 fugacissimis vix dentium longitudine ajqualibus; versus basin c 

 duplo cellarum serie compositis, irregulariter plicatis. Operculo conico obtuso mamillato. Calyptra sordide 

 albida nuda. 



This species differs from O. Canadense, Br. and Sch., by the smooth capsule. Although 

 at times it appears striate when empty, the capsular cells are nevertheless equal, and not at 

 all different at the apparent striae, which are produced solely by desiccation ; by the internal 

 peristome, much more fugacious, so much so that it is extremely difficult to find the 

 cilioli ; also, by the softer leaves. The peristome of this species resembles much that of 

 the O. strangulatum, and yet the latter has the cilioli larger and stronger, and far less 

 fugacious than our species. 



