262 BKYACEiE. [Porjonatum. 



shorter. — Bryol. Univ. ii. 122 ; Sulliv. Icon. Muse. Su])])!. 57, 

 t. 41. Polytrichum dentatum^ Menz. Trans. Linn. Soc. iv. 80, 

 t. 7, fig. 4 ; Schwaegr. Suppl. ii. 2. 11, t. 155. Polytridmm 

 cajnllare, var. oxycalyx^ Lindb. 1. c. 137. 



Hab. Northwest coast [Nelson, Menzies); Alaska {BlscJwff). 



From a companson of specimens received from Hampe of tlie true P. 

 dentatum, which exactly corresponds to Schwaegrichen's figures, it is 

 evident that tliis species is closely related to P. capillare, if not a mere 

 form of it. — {Sallivant.) 



5. P. COntortum, Lesq. Plants large, gregarious or loosely 

 cespitose, glaucous-green above, brown below ; stem simple or 

 with an innovation from under the perichaetium, loosely and 

 irregularly foliate its whole length : leaves erect, open, twisted 

 when dry, the lower short, gradually longer upward, all linear- 

 lanceolate, scarcely enlarged at base, sharply serrate to the base ; 

 costa percurrent, sparingly dentate on the back ; perichaitial 

 leaves similar : calyptra covering the whole capsule : capsule 

 ovate, cylindrical or obovate, erect or somewhat curved, some- 

 what constricted under the orifice when dry ; pedicel long, 

 flexuous ; lid convex at base, rostellate. — Mem. Calif. Acad. i. 

 27 ; Sulliv. Icon. Muse. Suppl. 58, t. 42. JPolytrichum contor- 

 tum, Menz. 1. c. 78, t. 7, fig. 2 ; Schwaegr. Suppl. i. 2. 325, t. 96. 

 Pogonatum laterale, Brid. Bryol. ii. 111. P. dentatum, Lesq. 

 1. c, in part. 



Hab. Alaska (Kellogg); northwest coast (Menzies)\ Columbia River 

 (Hall); clay banks in dense shaded woods, near Crescent City, California 

 (Bretcer); Rocky Mountains (Perry). 



6. P, atrovirens, Mitt. Stem simple and long: leaves 

 8j)reading, subcrispate and incurved when dry, broadly lanceo- 

 late, acute from an enlai'ged appressed base, serrate on the bor- 

 ders nearly from the base, dentate on the back : capsule short- 

 pedicellate, oblong, erect ; lid convex, short-rostrate. — Journ. 

 Linn. Soc. viii. 49. 



Hab. Sitka (Barclay). 



Differs from the last in the leaves more abruptly pointed^ enlarged at 

 the base and sheathing, with the basilar areolation more distinct. 



§ 2. Urnigera. Stems long, divided above and dendroid. 



7. P. urnigerum, Beauv. Stems dividing by more or less 

 numerous lateral innovations (2 to 10), all fertile : lower leaves 

 very small, squamiform, the upper crowded, open, appressed 

 when dry, linear-lanceolate, serrate from the slightly enlarged 



