272 BOTANICAL GAZETTE [OCTOBER 
Sporophyte as in the species. 
Has.: In very wet places, either floating or on substratum 
kept constantly wet by spray or falling water. It appears to be 
of common occurrence in Europe, but is seldom met with in N. 
America. Type locality Europe. 
Europe, Asia, Africa, and North America: New Jersey and 
Pennsylvania. 
This form has been confused with the submerged form of A. noterophilum 
by most bryologists who have worked with American mosses. The latter is 
usually a much larger plant, having the body of the leaf ovate or broader, 
generally not acuminate except by the very strong long excurrent Costa, 
which is twice as wide as that found in A. zvriguum spinifolium ; often 
appearing much wider, owing to the presence of a second layer of cells in the 
costal region of the lamina. 
AMBLYSTEGIUM NOTEROPHILUM (Sulliv.) Holzinger. Plate AIT, 
Sig. 3. 
Synon.: Hypnum noterophilum Sullivant, Musc. and Hepat. of U. 5. 78. 
1856. 
Hypnum fluviatile James, Proc. Academy Nat. Sciences of Philadelphia 
1855 :447. 1855. 
Hypnum irriguum var. spinifolium Lesquereux & James, Man. Moss. N. 
Amer. 374. 1884.—Macoun & Kindberg, Cat. Can. Pl. 6: 220. 1892. 
Amblystegium noterophilum Holzinger, Bull. Geol. and Nat. Hist. Surv. 
Minn. 9: 293. Nov. 1895. 
ExsiccaTi: Hypnum noterophilum Sulliv. & Lesq., Musc. Bot. Amer. (Ist 
ed.) 348. 
Amblystegium serpens trriguum noterophilum Austin, Musc. App. 385. 
Type in Herb. Sullivant, Cambridge. 
Gametophyte bisexual, of medium or large size, varying ae 
bright yellow green to a very dark dull green, rarely bronze in 
the new shoots of submerged plants, sometimes having a vitreous 
appearance, harsh and rigid, when growing out of water in cam 
moderately thick tufts, in the water forming crowded floating 
masses: stems rigid, prostrate or ascending when not submerged, 
otherwise floating, profusely and irregularly branched, 2 to Se 
long, 200 to 400m in diameter, cylindrical; cortex of three to 
