132 NORTH AMERICAN FLORA [VorumyE 15 
or more serrate ribs on the back, in cross-section near the middle with 5 or 6 guide-cells, stereid- 
bands above and below, and the outer cells on the dorsal side differentiated; leaf-cells with much 
thickened and pitted walls, elongate to the apex, the median ones about 12 » wide by 60 u long, 
the alar forming a reddish-brown group reaching about one half way to the costa; inner peri- 
chaetial leaves convolute, abruptly narrowed to a slender, serrulate point scarcely one half 
the broader part in length: seta solitary, red, 4 cm. long or more: capsule cylindric, somewhat 
curved; peristome-teeth divided along the median line only at the apex. (Character of teeth 
from Bescherelle under D. Andrieuxii.) 
TYPE LOCALITY: Michoacan. 
DisTRIBUTION: Apparently known only from the type locality and from ‘“’Totoniho” and 
““Chiquo”’ (the last two localities given for D. Andrieuxii). 
D, Andrieuxti is described as monoicous but the minute male plants grow on the tomentum of 
the fertile stems just as in D. lophoneuron. I have not seen the capsule, but according to Bescherelle 
the species especially differs from the other large members of the group by the scarcely divided teeth 
of the peristome, which if normal is certainly unique among North American species of large size. 
34. Dicranum enerve Thed.; Hartm. Skand. Fl. ed. 5. 393. 1849. 
Dicranum albicans B.S. G. Bryol. Eur. (43:) Dicranum Suppl. 1. 1850. 
Campylopus Hallit Lesq. in Porter & Coult. Syn. Fl. Colo. 155. 1874. 
Dioicous: male flowers unknown: fertile plants in compact, glossy tufts, usually whitish- 
green above, brown within, with more or less branching stems scarcely radiculose above or 
somewhat tomentose in the axils of the leaves: stem-leaves from erect-spreading to falcate- 
secund, 5-6 mm. long, from an ovate-lanceolate base gradually narrowed to a smooth, grooved 
or subtubulose point entire or denticulate at the apex; costa 400-600 « wide at the base, often 
nine tenths or more the width of the leaf, widening upward for a short distance, then tapering 
to the apex and forming most of the leaf, (the narrow blade extending scarcely one fifth up), 
in cross-section one half up showing mostly 3 layers of cells rather uniform in size, the outer 
rows hyaline, the middle row with chlorophyl; cells of the leaf-blade pale, elongate, with walls 
slightly thickened and pitted just above the alar; alar cells golden-brown, reaching to the costa; 
inner perichaetial leaves much shorter than stem-leaves, from a very broad, short base abruptly 
narrowed to a smooth, erect point: seta solitary, 12-20 mm. long, yellow finally turning reddish: 
capsule erect, cylindric, sometimes slightly curved, small-mouthed, about 2 mm. long with 
a rostrate lid two thirds as long and a distinct annulus; stomata in 2 rows near the base of the 
capsule, the exothecal cells one half up mostly 25-30 » wide and 30-50 wv long with uniformly 
slightly thickened walls; peristome-teeth at base about 60 wide, the outer plates below 
indistinctly striate, above becoming vertically striate to near the middle, then papillose to 
the apex: spores rough, up to 20 « in diameter. 
Type LocaLity: Europe. 
DISTRIBUTION: Yakutat Bay, Alaska; British Columbia; Colorado and New Mexico; also in 
Europe and Asia. 
ILLUSTRATION: B.S.G. Bryol. Eur. gl. 73. 
Exsice.: Macoun, Can. Musci 56, 404. 
35. Dicranum longifolium Hedw. Descr. 3: 24. 1791. 
Dicranodontium nitidum T. P. James, Bull. Torrey Club 6: 34. 1875. 
Dicranum serratum Kindb. Eur. & N. Am. Bryin. 190. 1897. 
Campylopus canadensis Kindb. Rev. Bryol. 32: 35. 1905. 
Dioicous: male plants more slender than the fertile and mingled with them: fertile plants 
in dense, often extensive tufts, light to dark, glossy-green, with paler leaf-bases giving a char- 
acteristic appearance to the rather slender stems 3-4 cm., rarely 8 cm., high: stem-leaves up 
to 8 mm. long, mostly falcate-secund, long-lanceolate, subtwbulose and rough above; costa 
broad, filling all of the upper part of the leaf, ribbed on the back, the ribs and margins rather 
uniformly and finely serrulate more than one half down, about 200 u wide at the base, often 
more than one half the width of the leaf, gradually becoming slightly wider upward, then taper- 
ing gradually to the apex, in cross-section showing a thickness of 3 or 4 rows of cells of nearly 
uniform size, the middle and lower rows interruptedly chlorophyllose, with cell-walls somewhat 
unequally thickened; alar cells brownish to hyaline, extending to the costa, more or less 
auriculate; cells of the narrow blade elongate, 8-10 » wide and 30-60 »w long toward the costa, 
