— 399 — 



7.P.RaTenelii Austin. 



» Differs from P. suhulatum: Upper leaves with longer sub- 

 lanceolate base; costa excurrent. Capsule broadly apiculate, a 

 little larger. — Light sandy soil r. Amer. U. S.»: Lesq. et Jam. 

 162. Archidium Bridel. 



A. Monoecious with male flowers on separate branches. 

 Leaf cells subrectangular. 



l.A.oliioense Schimper; SuUivant icon. muse. 



Leaves distant patent sublinear-subulate serrulate above; the 

 perichetial from ovate base abruptly acuminate; coeta gen. not 

 excurrent. - — Clay soil r, Amer. Can.: Macoun. 

 2.A.Hallii Austin. 



Leaves crowded euberect sublinear-subulate nearly entire; costa 

 sometimes excurrent. Perichetial leaves not seen. — Amer. r. 

 U. S.: Henry, com. Cardot. 



B. Synoecious or subparoecious (submonoecious). 

 S.A.alternifolinni Hooker et Taylor. — Phascum H. T.; Ar- 

 chidium Schimper; A. phascoides Brid. 



Leaves distant patent sublinear-subulate gen. entire; cells sub- 

 rectangular; perichetial leaves from ovate- oblong base abruptly 

 acuminate; costa sometimes excurrent. Stem with numerous 

 flagelliform shoots. Habit of Pletiridium alternifolium, -- Wet 

 soil viz. near lakes r. Eur, Sweden: France: Berthoumieu. 

 4.A.longifolium Lesquereux et James. 



» Synoecious. Leaves narrowly lanceolate-subulate; cells gen. 

 rectangular; costa excurrent. — Amer. r. U. S.»: Lesq. et Jam. 

 S.A.tenerrimum Mitten. 



» Differs from B. ohioense: Subparoecious. Leaf-cells much 

 shorter and closer. — Amer. r. U. S,: Drummond»: Lesq. 

 et Jam. 

 6.A.Ravenelii Austin. 



» Synoecious. Lower leaves ovate, upper ovate-lanceolate or 

 acute or obtuse entii-e; cells round-oval or rhomboidal; costa 

 sometimes excurrent. — Amer. r. U. S.»: Lesq. et Jam. 

 163. Ephemerum Harape. 



1. Ecostata. Leaves nerveless (r. faintly costate in upper 

 half.). 



2. Gostata. Leaves costate. Spores papillose. 



1. Ecostata. 

 A. Leaves serrate above middle; cells wide. 

 l.E.serratum Schreber. — Phascum Schr.; Ephemerum Hampe. 

 Leaves narrowly suboblong not long-acuminate. Spores pa- 



