— 158 — 
us. distinct apophysis, soon becoming brown. Stem us. simple. 
Apical cell of lamelle smooth or unipapillate. Lf 
B. Calyptra long-acuminate sparingly hairy. Loe 
IV. Polytrichadelphus. Capsule smooth with 2 angles - 
apophysis none. Leaves rigid not incurved. Stem branched. — 
I. Aloidella C. Mueller syn. FE 
A. Leaves incurved when dry; cells of lamelle smooth thin- 
walled; costa not exeurrent. Stem us. short simple. Protonema 
often persistent. | 
à. Upper leaves long narrow subulate, broadly sheathing; 
wings of lamina very broad; lamelle about 10. 
1.P.pennsylvanieum Hedwig; C. M. syn. — Pogonatum brevi- 
eaule Beauvois; Sulliv. icon. musc. E s 
Lower leaves short short-acuminate, upper distantly dentate 
or crenulate. Capsule subcylindric. Stem very short. — Clayey | 
soil by roadsides. Amer. eastern slope. Can.: Macoun; Fowler; . 
N. Foundl: Waghorne. U. S.: Sullivant, com. C. Mueller; 
Austin; Olney; Cummings. 
b. Leaves broad obtusate not long; lamelle numerous. 
2.P.nanum Schreber. — P. subrotundum Hudson; Braithwaite. 2 
Leaves subobtuse faintly crenulate above; wings of lamina — 
somewhat broader below. Capsule finally short-piriform. Stem 
simple not high. — Sandy or clayey soil. Eur. not r. in lower - 
regions. Sweden! 
3.P.brachyphyllum 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.aloides Hedwig. — Pogonatum Beauvois. Eo 
Leaves. sharply 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 d 
B. Leaves not incurved but gen. appressed when dry, Us. | 
sharply dentate with narrow wings; lamelle numerous, them — 
apical cell thick-walled papillose or crenulate. Stem r. simple. : 
a. Leaves sharply dentate. Stem us. branched. Bn 
5.P.urnigerum L. — Pogonatum Beauvois. i 
Leaves acute more or less acuminate, gen. not aristate, often — 
somewhat long; apical cell of lamellæ globose.  Perichetial 
leaves aristate. Capsule subcylindric us, large and not wide- 
