— 181 — 



in eubalp. districts. Eur. not r. Sweden, Norway, Germany, 

 Switzerl.! Finl.: Brotherus. yimer. r. Can.: Drummond. U. S.: 

 Roell. 



* D.zonatum Bridel. — VVeisia Brid.; Ditiiuhum Limpricht. 



Leaves acute or short-subulate, appressed when dry, suberect 

 when moist; costa percurrent or short-excurrent. Tufts dense 

 but sparingly radiculose, sometimes 3 — 4 c. m. high. Capsules 

 unknown. — ■ Rocks in alp. region r. Eur. Germany: Limpricht. 

 Austria: Breidler. Sweden: E. Nyman. Norway: Kaurin. 



bb. Perichetial leaves not sheathing. Peristome with distinct 

 basal tube. 

 lO.D.tortile GmeHn. — Mnium Gm.; Ditrichum Lindb. 



Leaves gen. somewhat long-gubulate and not or sparingly 

 denticulate, sometimes slightly recurved, us. not appressed when 

 dry; costa percurrent or short-excurrent. Tufts eradiculose. — 

 Sandy places also in alps. Eur. Sweden, Switzerl. 1 France: 

 Husnot m. gall. Amer, Can.: Macoun; Waghorne. 



*D.pusi11uiU Hedwig. — Trichostomum H.; Ditrichum Timm. 

 Stem lower; leaves shorter and less patent; costa scarcely 

 excurrent. — Eiir. not r. Sweden: M. Hubs. France: Husnot 

 m. gall. Amer. Can.: Drummond; Macoun. 



* D.niTale C. Mueller. — ■ Leptotrichum C. M.; Ditrichum 

 Limpricht. 



Leaves appressed when dry, suberect when moist; costa 

 fainter, excurrent in upper leaves. Capsule smaller. — Alp. 

 rocks r. Eur. Austria: Berggren, com. Grcenwall. 



b. Leaf-cells round-quadrate. Capsules unknown. 

 ll.D.elatuni Kindb. n. sp. — Leptotrichum flexicaule *brevi- 

 folium Kindb. cat. Can. m. 



Leaves small gen. entire, from short base abruptly tapering 

 to the not much longer acute or subulate acumen, appressed 

 when dry, patent when moist; costa percurrent. Tufts loose 

 eradiculose not glossy, to 6 c. m. high. — Alp. rocks r. Amer. 

 Can. Rocky mts: Macoun. 



12.D.Macoiinii C. M. et Kindb. — Distichium C. M. et K. 1. 

 c; Ditrichum Kindb 



Leaves small sometimes denticulate at apex, from short base 

 abruptly tapering to a longer subulate acumen, faintly appressed 

 when dry; costa percurrent. Tufts dense, radiculose below, 

 2 — 3 c m. high. — - Alp. rocks r. Amer. Can. Brit. Col.; J. 

 Macoun. 



