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II. Sselania Lindberg, 

 S.D.glaucescens Hedwig. — Trichostomum Hedw.; Ditrichum 

 Hampe; Leptotrichum Hampe; Schimper; Seelania csesia Lindb.; 

 Ditrichum montanum Leiberg bull. Torr. club 1893. 



Leaves sublinear or narrowly ovate- lanceolate acute serrulate 

 above, patent when dr}-; cells gen. short-rectangular or quadrate; 

 costa percurrent. Capsule oblong-cylindric straight sulcate when 

 dry; teeth purple, remotely nodose above; pedicel yellowish red. 

 Tufts not high. — Earth on rocks princ. in alps not r. Eur. 

 Sweden, Norway, Switzerl.! Austria: Venturi. Amer. Can.: J. 

 Macoun. Alaska: J. M. Macoun. Greenl.: Vanhoeffen. 

 III. Leptotrichum Hampe; Schimper. 

 1 . Xanthopodia. 



At Leaves gradually narrowed from ovate or lanceolate base, 

 denticulate above. 

 4.D.palliduTn Schreber. — Bryum Schreb.; Ditrichum Hampe. 



Leaves often denticulate to middle; upper cells long linear; 

 upper basal cells suboblong; costa broad not well-defined. Cap- 

 sule Buboblong; annulus revoluble; lid rostellate; pedicel often 

 very long. Tufts low and glossy. — Rocks and stone-walls 

 gen. r. Eur. princ. in southern districts. Switzerl.! Germany; 

 Herpell. Prance: Husnot. Amer. Can.: Macoun. U. S.: Sawyer, 

 com. Cardot. 



S.D.Schimperi Lesquereux. — Leptotrichum Lesq.; SuUiv. icon, 

 muscor.; Ditrichum Kindb. 



DiSers from the last: Leaves longer and nearly entire; costa 

 narrower. Capsule smaller and less sulcate; pedicel less long; 

 teeth indistinctly articulate; peristomial tube orange more distinct; 

 spores much larger. — Wet earth and rocks r. Amer. Pacif. 

 distr. Can.: Can.: Macoun. U. S.: Botender, com. Renauld; 

 Howell, com. Cardot. 



* D.flexifollum Renauld et Cardot. — Trichodon Ren. et C; 

 Ditrichum Kindb. 



Leaves less long and more flexuous; upper cells shorter. Tufts 

 green. Capsules unknown. — Sandy soil r. Amer. U. S.: Sa- 

 wyer, com. Cardot. 



» Ditrichum Breidleri Limpricht (plant hybrid ?) — Agrees 

 with D. pallidum in shape of leaves and in yellow pedicel. 

 Differs from it: Plants scarcely 4 m. m. high, stem 1 m. m. 

 Capsule oval not f-triate; lid obtuse subpersistent; teeth short 

 small brittle; armulus not distinct; pedicel thick not much ex- 

 gerted above upper leaves. — On wet earth. Eur. Austria, iu 



