m u s o i. 27 



Tribe 12. POLYTRICHE-SJ. 



1. POLYTRICHUM, Brid. 



Subgenus 1. Atrichum, Pal. Beauv. 



Peristoma denies 32. Gapsula cylindrica inclinata. Operculum longi- 

 rostre. Galyptra nuda, apice subspintdosa. 



1. POLYTRICHUM UNDULATUM, Hedw. 



Polytrichum undulatum, Hedw. Stirp. 1, p. 43, t. 16. 



Atrichum undulatum, Pal. Beauv.; Bryol. Europ. 4, Atric. Monogr. p. 8, t. 1 and 2. 



Hab. Fort Nisqually, and Port Discovery, Oregon. 



Subgenus 2. Cyphoma, Hoolc,fil. & Wils. 



Peristoma dentes, 64. Capsida super ne plana, in/erne gibba. Calyptra, 

 subnuda. 



2. Polytrichum Magellanicum, Hedw. 



Polytrichum Magellanicum, Hedw. Sp. Muse. p. 101, t. 20; Flo. Antarct. t. 59, f. 3; 

 Flo. N. Zeal. p. 91. 



Hab. Orange Harbor, Fuegia. 



The subgenus Cyphoma with its character, is from the Flora of New 

 Zealand. In our specimens (which are perhaps not in a fit state), the 

 normal form of the capsule does not appear to be plano-convex. When 

 much past maturity, the capsules become horizontal, and in conse- 

 quence of the collapse of the wall of their upper side, sometimes 

 assume nearly that form : even the figure above cited from the Flora 

 Antarctica, favors this view. 



