Part 2, 1913] DICRANACEAE 121 
13. Dicranum rhabdocarpum Sull. Mem. Am. 
Acad, II. 4: 172, 1849. 
Dicranum scoparioides Schimp.; Besch. Mém. Soc. Sci. Nat. Cherbourg 16: 164. 1872. 
Dioicous: male plants in more or less separate tufts, more slender than the fertile, branch- 
ing, with rather large flowers scattered along the stems, the antheridia about 0.6 » long: fertile 
plants in compact, pale glossy-green tufts, with stems 3-4 cm. long and leaves erect-spreading, 
the points irregularly flexuous or straight when dry, never crispate and rarely subsecund: 
stem-leaves about 5 mm. long, ovate-lanceolate, acute, serrulate on the margins about one fourth 
down; costa pale, vanishing below the apex, serrulate on the back above, just above its broad- 
ened base about 50 » wide and one tenth the width of the blade or less, in cross-section near 
the middle showing about 4 guide-cells with stereid-bands above and below of about 2 rows of 
cells not always well differentiated; alar cells golden-brown or hyaline, more or less inflated, 
not extending to the costa, the cells above elongate with unequally thickened walls pitted 
nearly to the apex, the median ones about 8 » wide and 40-60 » long; inner perichaetial leaves 
narrowly costate, rather gradually narrowed to a nearly smooth, slender point scarcely one half 
the broader part in length: seta yellow or finally reddish, solitary, up to 2.25 cm. high: capsule 
erect, cylindric, 3-3.5 mm. long, furrowed when dry, with exothecal cells, except near the 
mouth, elongate with unevenly thickened slightly sinuous walls; annulus wanting; lid with its 
erect beak nearly two thirds the length of the capsule; peristome-teeth reddish-brown, verti- 
cally striate, divided or perforate often three fourths down, the inner articulations prominent: 
spores slightly rough, up to 18 u in diameter. 
Tyre Locatrry/ Colorado. 
DistRIBUTION: Colorado, New Mexico, and Mexico. 
ILLUSTRATION: Mem, Am. Acad. II. 4: $l. 3. 
Exsicc.: Sull. & Lesq. Musci Bor. Am. ed. 2.82; Clements, Crypt. Form. Colo. 196, 392, in part. 
14. Dicranum Drummondi C. Mill. Syn. 1; 356, 1848. 
Dicranum undulatum var. Hook. in Drummond, Musci Am. 86. 1828. 
Dioicous: male plants minute, on tomentum of the fertile stems, the perigonial leaves 
ecostate, narrowed to a rather short, stout, scarcely serrulate point: fertile plants in extensive, 
dull-green, loosely cohering tufts, often densely tomentose within, with robust stems up to 
10 em. high: stem-leaves up to 9 mm. long and about 1 mm. wide, spreading flexuous, some- 
times irregularly secund, usually somewhat undulate toward the apex, from a lanceolate base 
gradually narrowed to a slender, grooved, serrate, acute point exceeding the basal part in 
length; leaf-blade on the back above nearly smooth or with more or less scattered papillae, 
the margin more or less serrate three fourths down; costa just above the spreading base about 
125 p wide, and one fifth to one seventh the leaf-width, percurrent or slightly excurrent, dentate 
on the back toward the apex and papillose below to near the middle, in cross-section one half 
down showing about 8 guide-cells with thick stereid-bands above and below, the outer row of 
cells differentiated on the dorsal side only; alar cells brown; cells of the lower part of the blade 
mostly narrowly linear, 8-10 4 wide and 60-100 « long, with somewhat thickened, pitted walls 
extending about one fifth up the leaf, then shorter with slightly and mostly uniformly thickened, 
not pitted walls, the median cells rather irregular, mostly from twice longer than broad to 
‘nearly square, about 8 » wide, becoming toward the apex rather more elongate again; inner 
perichaetial leaves shorter than the stem-leaves, with a convolute base abruptly narrowed to 
a slender, serrulate point about one half the clasping part in length: setae aggregate, 1-4 in 
the perichaetium, yellowish, 2-2.5 cm. long: capsule about 2.5 mm. long, curved, nodding, not 
strumose, furrowed and contracted under the mouth when dry; peristome-teeth 100 » wide 
at the base, vertically striate, divided one half down or more into 2 or 3 forks; annulus distinct, 
of 2 rows of cells: spores somewhat rough, up to 20 u in diameter. 
TyPE LOCALITY: North America. 
DistRIBUTION: Maine to Manitoba and Montana, and southward to New Jersey and Colorado. 
ILLUSTRATION: Sull. Ic. Muse. Suppl. gl. 33. 
Exsicc.: Drummond, Musci Am. 86; Sull. & Lesq. Musci Bor. Am. 696; ed. 2. 88; Macoun, 
Can. Musci 43, 47; Holz. Musci Acroc. Bor. Am. 131, 
