— 398 — 



2.P.alternifolium Dickson. — Phascum Dicks.; Pleuridium 

 Rabenhorst. 



Upper leaves somewhat abruptly subulate gen. serrulate above; 

 costa sometimes excurrent. Capsule subovoid with straight point. 

 Tufts green. — Eur. not r. in northern dietr. Sweden! France: 

 Lamy. Finl.: Bomansson. Amer^ U. S.: Howe; SuUivant, com. 

 C Mueller. 

 S.P.Bolaeiideri C. MueUer. 



Upper leaves gradually subulate nearly entire, shorter than 

 in the last; costa excurrent. Capsule ovoid with oblique point. 

 Tufts dark green. — Amer. r. U. S. Chicago: Roell. 



B. Paroecious or synoecious. 



a. Upper leaves not larger than the lower. 

 4.P.axiIlare Dickson. — Phascum Dicks.; Pleuridium Lindb.; 

 P. nitidum Rabenhorst. 



Leaves narrowly ovate-lanceolate acute; costa faint not ex- 

 current. Capsule ovoid often lateral. — Eur. not r. Sweden! 

 Engl.: Rogers. Austria: Schmidt. 



b. Upper leaves larger than the lower. 



5.P.palnstre Br. eur. — Phascum Br. eur.; Pleuridium Husnot. 



Leaves crowded: upper ovate-oblong; costa long-excurrent. 

 Calyptra mitiiform. Capsule round-ovoid; pedicel very short. 

 Protonema often persistent. — Wet earth. Eur. not common. 

 Sweden: S. Berggren; J. Persson. Belgium: Gravet. Amer. ^U. S.>: 

 Lesq. et Jam. 



S.P.sabnlatam Hudson. — Phascum Huds.; Pleuridium Ra- 

 benhorst. 



Leaves gen. distant; the upper from ovate-oblong base nearly 

 gradually subulate; costa not well-defined above and scarcely 

 excurrent. Calyptra cucullate. Capsule ovoid apiculate; pedicel 

 us. very short. Protonema not persistent. — Sandy soil. Eur. 

 princ. in southern distr., r. in northern. Switzerl.l Sweden: M. 

 Huss. Engl.: Whitehead. France: Husnot. Amer. »U. S.»: Lq. et J. 



* P.anonialnm Eandb. in nuovo giorn. bot. ital. 1893 (as var.). 



Capsule with distinct lid; pedicel arcuate emergent above 

 leaves. — On sand at a stonewall, mixed with P. subulatum 

 and Ditrichum pallidum (hybride form ?). Eur. Switzerl. near 

 Lugano! 



* P.astomoides Limpricht. 



sHybride form ? Capsule without distinct lid, shorter than 

 the straight not emergent pedicel. — Mixed with P. subulatum 

 find Ditrichum pallidum. Eur. Austria; Breidler»: Limpricht, 



