Closely allied to D.fuscescens, Turn., to which it might be subordinated as a sub-species, but nevertheless easily distinguished by the leaves being more strongly serrate, very rough on the back, less narrowly subulate and the nerve thicker and broader.
Leading Tickle and Hermitage Bay, Newfoundland, 1893 and 1895. (Waghorne.)
103. D. Muehlenbeckii, Bruch & Schimp.
On stumps at Fox River, Gaspé Co., Que., Aug. 3rd, 1882; on roots of trees, Lake Nipissing, Ont. Both these specimens were referred to D. fuscescens in Part VI., 29; on earth along Jumping Pound Creek, Rocky Mountains, 1897. (Macoun) Growing amongst boulders at Lake Lindeman, Yukon, 1899. (Williams.) On rock, Chilliwack Valley, B.C., 1901. (J. M. Macotm.)
105. D. Canadense, Kindb.
On earth in wet woods at Baddeck, Margaree and Half Way Brook, Cape Breton Island, N.S., 1898. Rather common and with the general appearance of the species but the capsule always single. On old logs at Belleville, Ont., May 26th, 1874; on earth in woods, White Trout Lake Algonquin Park, Ont., 1900. (Macoun.) On rotten logs at Edmonton. Ont., Sept., 1892. (Jas. White.)
977. D. camptophyllum, Kindb., Bryol. N. Am. & Eur. p. 193.
Leaves tapering to a long subulate point, in the upper half of the acumen strongly serrate, falcate and not crisped when dry; cells not porose; those of the acumen subquadrate, the alar cells yellow, dilated, subrectangular, reaching to the costa; other basal cells long. Perichetial leaves obtusate or abruptly tapering to a generally longer, narrow-subulate or subfiliform awn with a long-excurrent costa. Capsule solitary, not sulcate. Tufts green above.
Clearwater Lake, northern Labrador, July 21st, 1896. (A. P. Low.)
Var. poriferum, Kindb.
On old logs along Bragg's Creek, Elbow River, Rocky Mountains, Alta., June 22nd, 1897. (Macoun.)
978. D. algidum, Kindb., Revue Bryol. 1896.
Leaves entire, nearly straight and suberect, only the upper flexuous, narrower than in D. fuscescens; angular cells nearly uniform dilated; other cells very porose, and generally long; costa very narrow, nearly smooth at the back or slightly rough in the excurrent part. Tufts soft and silky, green or dark green, nearly eradiculose. Capsules unknown. Habit of D. spadiceum; differs from it principally in not having convolute leaves.
On damp rocks, Lake Agnes, Rocky Mountains, Alta., Aug. 19th, 1891, alt. 7,500 feet. (Macoun.)
979. D. subspadiceum, Kindb., Bryol. N. Am. & Eur. 199.
Leaves straight, erect, subconvolute, denticulate near the apex and at the excurrent part of the costa. Tufts brown with yellowish branching tops. Capsules unknown.
On Mount Aylmer, Devil's Lake, Banff Park, Alta., alt. 8,000 feet, Aug. 6th, 1891; on earth at Hector, Rocky Mountains, B.C., July 28th, 1885. (Macoun.)
107. D. elongatum, Schw.
Near Fort Norman, Mackenzie River, July, 1892. (Miss E. Taylor.) On the summit of Mount Albert, Gaspé Co., Que., July 25th, 1881. (J. A. Allen) On the Barren Grounds, Lat.61°, Long. 104, W., west of Hudson Bay, July, 1893. (J. B. Tyrrell.) Along the Athabasca River, above Athabasca Landing, May 28th, 1888. (J. M.Macoim) On earth, Mosquito Bay, Lat. 60° 42', Labrador, Aug. 13th, 1898. (A. P. Low) St. Paul Island, Behring Sea. (Dr. Merriam) Very common on both old stumps and rocks in damp places at Dawson, Yukon, 1899. (Williams.)
Subsp. attenutaum, Kindb., Bryol. N.Am. & Eur. p.201.
Leaves larger, gradually tapering to a somewhat long subula, nearly entire and often somewhat brittle, the uppermost flexuous; costa short-excurrent. Capsule more or less curved. Habit of D. fragilifolium. Tufts low.
Labrador. (Waghorne) On earth along Jumping Pound Creek, Rocky Mountains, Alta., June 12th, 1897. (Macoun)
Subsp. subfragilifolium, Kindb., Bryol. N. Am. & Eur. p. 201.
Leaves narrow, long-subulate, faintly denticulate above, flexuous, sometimes brittle; costa long-excurrent, narrow. Capsule arcuate.
109. D. fragilifolium, Lindb.
On decayed wood along the Athabasca River above Athabasca Landing, May 28th, 1888; on old logs, Chilliwack Valley, B.C.; 1901. (J. M. Macoun) Along Bragg's Creek, Elbow River, Rocky Mountains, Alta., June 22nd, 1897. (Macoun) Very common on decayed logs about Dawson, Yukon, 1899. (Williams.)
110. D. longifolium, Hedw.
On dry granite boulders in the Parry Sound District, Ont., May, 1893. (Jas. White.) On logs and rocks, Big Intervale, Mar-garee, on earth, sand and rocks, very common, at Half Way Brook, Cape Breton Island, N.S., July, 1898; also on boulders at Meech's Lake, near Chelsea, Que., 1893.
Var. subalpinum, Milde.
On rocks, Blackwater River, Lake Nipigon, Ont., July, 1884; on rocks at Sudbury Junction, Ont., 1884; on rocks 5 miles below Hector, Rocky Mountains, B.C., Aug., 1890. (Macoun.)
112. D. Bonjeani, De Not.
On earth in woods, Queenston Heights Ont., May 11th, 1901; on damp earth, Pelee Point, Essex Co., Ont., May 29th, 1901; in wet woods, Camlachie, Lambton Co., Ont., June 18th, 1901. The latter specimens in fine fruit. (Macoun.) On rather dry ground at Lake Lindeman, Yukon, 1899. (Williams.)
980. D. Roellii, Kindb. in Hedwigia, 1896, p 60.
Differs from D. Bonjeani, in the leaves neither spreading nor undulate, and their costa sometimes bilamellate. More nearly allied to D. scoparium, but differs from it in the leaves being faintly crenulate at the acumen, their upper cells suboblong, less porose; costa shorter, and nearly smooth at the back.
Collected on Vancouver Island by J. Roell. On rocks, Cadboro Bay, near Victoria, Vancouver Island, May 31st, 1893. (Macoun.)
981. D.angustum, Lindb.; Card. &Ther. Bot. Gaz., Vol. XXX., p. 15.
A polar moss, known only from some localities of North Finland and Siberia. It is easily distinguished from D. Bonjeani, De Not., by the leaves being straight, not undulate, convolute, and entire, and by the thinner costa, the less porose cells, and the perichaetial leaves long-piliferous.