Leaves short, very broad, ovate or ovate-oblong, or from a cordate strongly papillose base slightly contracted to a lingulate blunt acumen. Perichetial leaves with subdentate strongly papillose base and narrow lingulate acumen. Capsule small, oval-oblong; segments rudimentary; lid short-conic, not apiculate; pedicel yellow very much shorter than in A. apiculatus.
On trees in woods west of the Beaver Meadow, west of Hull, Que., Oct., 1884; on trees in swamps at Belleville, Hastings Co., Ont., 1868. (Macoun.)
648. A. apiculatus, Bruch & Schimp.
On rocks in woods, Cāche Lake, Algonquin Park, Ont., June 9th, 1900. (Macoun.)
On a limestone ledge, Havelock, King's Co., N.B. (J. Moser.) Limestone rocks, Credit Forks, Ont., Sept., 1892. (Jas. White.) On rocks in a ravine, Big Intervale, Margaree, Cape Breton Island, N.S., July, 1898. (Macoun.)
650. A. heteroideus, C. M. & Kindb.
On limestone rocks, Credit Forks, Ont., Sept. 1892. (Jas.White.) On flat limestone rocks, Meech's Lake, near Chelsea, Que., Sept., 1893. (Macoun.)
1120. A. glabellus, Kindb.
On rocks, Moose Mountain, alt. 7000 feet, Elbow River, Rocky Mountains, July 1st, 1897. (Macoun)
1121. A. Moseri, Kindb., Note on Can. Bryol., 1893.
Leaves as in A. nervosus but smaller; cells more rotundate. Perichetial leaves narrowly ovate-oblong, obtusate or shortacuminate, denticulate at least above the middle. Capsule lanceolate-cylindric, small mouthed; teeth pale; segments as high with a distinct basal membrane; lid apiculate; pedicel twice longer than in A. nervosus.
1122. A. tectorum, Al. Braun.
On rocks, Greenland. (Berggren fide Kndberg.) On rocks, Moose Mountain alt. 7500 feet, Elbow River, Rocky Mountains, July, 1897. (Macoun.) On rock in rather dry places, lakes Lebarge and Dawson, Yukon. (Williams.)