1897] NORTH AMERICAN SPECIES OF AMBLYSTEGIUM 275 
papillose, 16 to 30m in diameter: calyptra one-half to three- 
fourths the length of the capsule, split one-third its length, fall- 
ing before the spores are mature. 
Has.: In springs and at their margins (usually calcareous), 
and the streams running from them. Type locality Franklin 
county, Pennsylvania. 
North America: Pennsylvania, New York, Illinois, Michigan, 
Wisconsin, Minnesota, Montana, Ontario. Local. 
A plant that appears to be related to both 4. ivriguum and A. fluviatile 
with both of which it has been associated, especially the large floating form, 
Doubtless the absence of the sporophyte from most material and the exclu- 
sive (?) use of the water form for study have led to this confusion. 
AMBLYSTEGIUM FLUVIATILE (Swartz) Br.& Sch. Plate XII. fig. 2. 
SYNnon.: Hyfnum fluviatile Swartz, Musc. Frond. Suec. 63. 1799.— Hed- 
wig, Spec. Muse. 277. A/. 71. fig. 4. 1801.— Palisot de Beauvois, Prodr. 1805. 
— Weber & Mohr, Bot. Tasch. 303. 1807.—Schwegrichen, Spec. Musc. 
Suppl. 1. 2 : 263. 1816.—Hartmann, Skand. FI. (5th ed.) 333. 1849.— Wilson, 
Bry. Brit. 359. A/. 55. 1855.— Berkeley, Handb. Brit. Moss. 98. 1863. — Hob- 
kirk, Syn. 164. 1873.— Lesquereux & James, Man. Moss. of N. Amer. 375. 
1884. 
Hypnum orthocladon Palisot de Beauvois, Prodr. 67. 1805. 
Hypnum palustre fiuviatile oe Fl. Suec. (2d ed.) 732. 1833. 
Amblystegium fluviatile Bruch & Sch mper, Bry. Eur. Ambly. Suppl. 
713. 1876.— Milde, Bry. Siles. sah 1869.— Hartmann, Skand. Fl. (roth se 
20. 1871.— Lindberg, Musc. Skand. 32. 1879.—R. duBuysson, Ess. Ana 
gen. Ambly. 12, 1883.— Hobkirk, Syn. (2d ed.) 213. ek 
berg, Cat. Can. Pl. 6: 220. 1892.—Husnot, Musc. Gall. 360. 1894.— Dixon 
— Stud. Handb. 445. f/. 56. 1896.— Braithwaite, Brit. Moss Fis: 
ne biaicichh ieciccnite Boulay, Muse. Fr. 73. 1884. 
“OAR Amblystegium fluviatile Austin, Musc. App. 38.— Macoun, 
Can. Muse. 446. 
TYPE in herb. Swartz, Stockholm. 
Gametophyte bisexual, soft and pliant, of medium or large size, 
When not submerged on a solid substratum in dense thick tufts, 
when submerged, having a looser habit, sometimes considerably 
elongated and sii, chien? faa in color from a dark dirty green to 
