Part 2, 1913] DICRANACEAE 131 
long; perichaetial leaves sheathing, truncate or emarginate at the apex, sometimes muticous, 
generally tipped with a short or slightly elongate subula: seta yellow, 2-3 cm. long: capsule 
‘cerntious or horizontal, narrowly cylindraceous, curved, not sulcate, long-attenuate below, 
3.5-4 mm. long, 0.5-0.75 mm. broad; lid long-subulate. 
‘TYPE LOCALITY: Minnesota. 
DistrRiBurion: Known only from the type locality. 
ILLUSTRATION: Bot. Gaz. 15: pl. 5B. 
Exsicc.: Ren. & Card. Musci Am. Sept. Exs. 11. 
This moss is so near D. scoparium, scarcely differing except in the perichaetial leaves, that 
farther collections are desirable to determine its proper rank. 
32. Dicranum Bonjeanii De-Not.; Lisa, Elenco 29. 1837. 
Dicranum palustre B.S.G. Bryol. Eur. (37-40:) Dicranum 39. 1847. 
?Dicranum dipteroneuron C. Mill. Flora 70: 221. 1887. 
Dicranum leioneuron Kindb.; Macoun, Bull. Torrey Club 16:92. 1889. 
Dicranum congestiforme C. Mill. & Kindb.; Macoun, Cat. Can. Pl. 6:29. 1892. 
Dicranum plano-alare C. Mill. & Kindb.; Macoun, Cat. Can. Pl. 6:31. 1892. 
Dicranum undulifolium C. Mill. & Kindb.; Macoun, Cat. Can. Pl. 6:32. 1892. 
Dicranum subpalustre C. Mill. & Kindb.; Macoun, Cat. Can. Pi. 6:33. 1892. 
Dicranum Roellii Kindb.; Réll, Hedwigia 35:60. 1896. 
Dicranum hyalinum Kindb.; Réll, Hedwigia 35: 61. 1896. 
Dicranum perichaetiale Kindb.; R6ll, Hedwigia 35: 61. 1896. 
Dicranum alatum Card. & Thér. Bot. Gaz. 37: 364. 1904. 
Dioicous: male plants minute on tomentum or large and in more or less separate tufts: 
fertile plants in extensive, mostly dull-green or pale, yellowish-green tufts, with tomentose stems 
up to 15 cm. high: leaves erect or spreading-flexuous, undulate or smooth, usually not curved- 
secund, mostly 6-8 mm. long and 1-1.5 mm. wide, lanceolate, gradually narrowed to a broadish 
obtuse or acute, serrate to entire point more or less grooved but usually scarcely tubulose; 
costa vanishing below the apex, from serrate-winged to nearly smooth on the back, in cross- 
section as in D. scoparium; leaf-cells more or less thickened pitted and elongate throughout, 
the nm edian ones about 12 » wide and 25—50 » long or sometimes not more than one and one half 
times as long as wide, the alar forming a reddish-brown or more or less hyaline cluster extending 
about half way to the costa: sporophyte as in D. scoparium. 
TyPE LocaLity: Italy. 
DistRiBuTiIon: Labrador to Alaska and southward to Virginia, Ohio, and Colorado; also in 
Europe and Asia. 
InLusrrations: B.S.G. Bryol. Eur. pl. 79; Braithw. Brit. Moss-Fl. pl. 22B. 
Exsice.: Sull. & Lesq. Musci Bor. Am. 66; ed. 2.83; Aust. Musci App. 92; Macoun, Can. Musci 
408, 409; Holz. Musci Acroc. Bor. Am. 205. 
Most of the characters relied on to distinguish this species from D. scopavium seem to fail. The 
costa is not excurrent in either, it varies from serrate-winged to nearly smooth on the back in both, 
and the capsule may finally become furrowed in both. Evidently the shining, glossy plants with 
falcate-secund, more or less tubulose, narrowly pointed, rarely undulate leaves with mostly narrow 
cells should be placed under D. scoparium, while those plants with mostly dull or pale, yellowish- 
green, rarely secund leaves, either strongly undulate or not undulate, with broader, flatter, often 
very short and blunt point and often wider, shorter leaf-cells should be referred to the scarcely 
‘specifically distinct D. Bonjeani. . 
D. dipteroneuron C. Miill., from Alaska, has been referred to D. brevifolium (see Paris, Index 
Bryol. ed. 2. 2: 53), but from Miiller’s description and remarks it appears to be a form of D. Bonjeani. 
Specimens collected at Fort Conger, Greenland, in 1902 (Peary 16a) have been described as 
D. spadiceum obtusum Bryhn, Forh. Vid.-Selsk. Christ. 1908: 15. 1908. In the herbarium of the 
New York Botanical Garden under this number are two species of Dicranum. One has the upper 
cells of the leaf elongate, the leaves smooth on back and the costa vanishing; it seems to be a form 
of D. Bonjeanii. The other has the upper cells of the leaf much shorter, more or less angular and 
irregular, the leaf rough on the back often one half down and the costa more or less percurrent or 
excurrent; it is near some of the forms of D. fuscescens with short-pointed leaves. 
33. Dicranum lophoneuron C. Mill. Syn. 2: 589. 1851. 
Dicranum Andrieuxii Besch. Mém. Soc. Sci. Nat. Cherbourg 16: 164. 1872. 
Dioicous: male plants 2-3 mm. high, on tomentum of the fertile stems: fertile plants in 
deep tomentose tufts, resembling the larger forms of D. Bonjeani in size and habit: leaves 
laxly spreading-flexuous, scarcely secund and more or less undulate; upper stem-leaves 9-10 
mm. long, from an ovate-lanceolate base gradually narrowed to a rather stout, grooved, often 
twisted point, sharply dentate on the margins and costa about one third down; costa nearly or 
quite percurrent, just above its broadened base about one eighth the width of the leaf, with 2 
