284 BOTANICAL GAZETTE [OCTOBER 
Gametophyte very much attenuated: stems long, filiform, 10 to 
40™ long, sparingly branched ; branches correspondingly long: 
leaves slender, remote. 
Sporophyte usually much larger than in other forms, 3 to 6™ 
or more long, not abundant. 
Has.: Growing in the water, generally in shaded places. 
A common form in N. America with the species. 
AMBLYSTEGUM RIPARIUM FLUITANS (L. & J.) R. & C. 
Synon.: Aypnum riparium var. fluitans Lesquereux & James, Man. 
Moss. N. Amer. 
Amblystegium Viera var. fluitans Renauld & Cardot, Musc. Amer. 
Sept. 58. 1893 
Gametophyte large: stems and branches long, 10 to 20™, dirty 
green or yellow: leaves large, 800 w wide by 3200@ long, some- 
times more than 4000 p» in length and of proportionate width. 
Sporophyte rarely produced, not seen by me. 
Has.: Floating in shallow water at margins of streams and 
from logs, stumps, etc., in the water. 
With the species. Not uncommon. 
AMBLYSTEGIUM RIPARIUM LONGIFOLIUM (Schultz) Sch. & Buys. 
SYNON.: ook acrenee Schultz, Fl. Starg. 335. 1806.— Bridel, 
Spec. Musc. 2: 114. ant. Musc. 158. 18109. 
flypnume Vedas ae Bridel, ine ry. Univ. 2: 414. 1827. 
Amblystegium riparium var. longifolium Schimper, Syn. Muse. (1st ed.) 
598. 1860. (2d ed.) 718. 1876.— Braithwaite, Brit. Moss. Fl. 3:29. 
Gametophyte large, yellowish green to bright yellow or bronze: 
stems moderately elongated, 3 to 8™ long: leaves large, 600 to 
700 wide by 3500 to 4200 long, acuminate, acumen very 
slender. 
Sporophyte unknown to me. 
Has.: Europe, and North America: Vancouver and Washing- 
ton. 
The forms here given as varieties are thought to be the most constant 
ones and those about which the well nigh numberless others may be satisfac- 
torily grouped. 
