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US. distinct apophysis, soon becoming brown. Stem us. simple. 

 A-pical cell of lamellae smooth or unipapUIate. 

 B. Calyptra long-acuminate sparingly hairy. 

 IV. Poljtrichadelphiis. Capsule smooth with 2 angles; 

 apophysis none. Leaves rigid not incurved. Stem branched. 

 I. Aloidella C. Mueller syn. 



A. Leaves incurved when dry; cells of lamellje smooth thin- 

 walled; costa not excurrent. Stem us. short simple. Protonema 

 often persistent. 



a. Upper leaves long narrow subulate, broadly sheathing; 

 wings of lamina very broad; lamellae about 10. 

 l.P.pennsylvanicnm Hedwig; C. M. syn. — Pogonatum brevi- 

 caule Beauvois; Sulliv. icon. muse. 



Lower leaves short short-acuminate, upper distantly dentate 

 or creimlate. Capsule subcjdindric. Stern very short. — Clayey 

 soil by roadsides. Amer. eastern slope. Can.: Macoun; Fowler; 

 N. Foundl.: Waghorne. U. S.: Sullivant, com. C. Mueller; 

 Austin; Olney; Cummings. 



h. Leaves broad obtusate not long; lamellae numerous. 

 2.P.namiin Schreber. — P. subrotundum Hudson; Braithwaite. 



Leaves subobtuse faintly crenulate above; wings of lamina 

 somewhat broader below. Capsule finally short-pii-iform. Stem 

 simple not high. — Sandy or clayey soil. Eur. not r. in lower 

 regions. Sweden! 

 S.P.lbrachyphyllnm Richard. — Pogonatum Sulliv. icon. m. 



Differs from the last: Leaves obtuse entire; capsule suboval; 

 stem shorter. — Roadsides. Amer. U. S.: Austin; Langlois, 

 com. Cardot. 

 4.P.aloi(les Hedwig. — Pogonatum Beauvois. 



Leaves sharpl}- dentate us. somewhat short, less broad than 

 in the both last and gen. longer acuminate; wings of lamina 

 narrow. Capsule oblong-piriform or subcylindric. Stem often 

 somewhat high r. branched. — Sandy soil. Eur. not r. Swe- 

 den, Germany, Switzerl.l 



B. Leaves not incurved but gen. appressed when dry, us. 

 sharply dentate mth narrow wings; lamellae numerous, their 

 apical cell thick-walled papillose or crenulate. Stem r. simple. 



a. Leaves sharply dentate. Stem us. branched. 

 S.P.iirnigerum L. — Pogonatum Beauvois. 



Leaves acute more or less acuminate, gen. not aristate, often 

 somewhat long; apical cell of lamellae globose. Perichetial 

 leaves aristate. Capsule subcylindric us, large and not wide- 



