Be ee os aoa 
1897 | NORTH AMERICAN SPECIES OF AMBLYSTEGIUM 271 
Europe, Asia, Africa, and North America: New England, 
New York, New Jersey, Ohio, West Virginia, Wisconsin, Mon- 
tana, Minnesota and Ontario. Not uncommon. 
Long confused with A. fuviatile, from which plant it may be known by 
its long acuminate leaves, with a costa tapering gradually and uniformly 
from the base to the tip of the leaf, and by the leaf cells, which, above the basal 
row, are commonly uniformly smaller. This is especially true for the basal 
third of the leaf. The general habit of the two plants will aid in separating 
them, 4. ivriguum havingaharsh and rigid appearance, while 4. fluviatile 
is soft and pliable. 4. érriguum may be distinguished from Hypuum filict- 
num. by the broad triangular ovate leaves of the latter, having a distinctly 
serrate margin in the upper part and having the cells in the alar regions 
inflated. 
AMBLYSTEGIUM IRRIGUUM SPINIFOLIUM Schimp. Plate X//. 
re. 2. 
NON. :' Hypnum fallax Bridel, Musc. Recent. 37: 66. p/. 2. fz. 1801. 
(fide Schimper, and many later authors. 
Hypnum filicinum var. fallax Hooker & Taylor, Muscologia Brittanica, 
109.— Bridel, Bry. Univ. 2: 531. 1827. 
ypnum fluviatile C. Mueller, Syn. Musc. Frond. 2: 420. 
Amblystegium irriguum var. fallax Schimper, Syn. Muse. Eur, (ist ed.) 
594. 1860. 
Amblystegium irriguum var. spinifolium Schimper, Syn. Musc. Eur, 
(2d ed.) 713. 1876. 
Amblystegium a oe Musc. Scand. 32. 1879.—Braithwaite, 
Brit. Moss. Fl. 3: g. pt. 8 896. 
Amblystegium a var. fallax Lindberg, Musc. Scand. 35. 1879. 
Amblystegium fluviatile var. irriguum, forma spintfolium R. du Buys- 
Son, Ess. Anal. gen. Ambly. 3- 
Amblystegium vallis- clause var. spinifolium Husnot, Musc. Gall. 361. 1894. 
TYPE in Herb. Bridel 
Gametophyte more robust than in the species; stems longer, 
3 to 12™, more loosely branching; leaves generally longer ana 
narrower, with a long excurrent slender-pointed costa, gO to 1800p 
long by 200 to 585 wide; leaf cells at least in the upper por- 
tions of the leaf correspondingly elongated, 6 to 9m wide by 40 
to 70n long. 
“No attempt has been made to give a complete synonomy, owing to the confusion 
Prior to the time of Schimper. 
