186 ; NORTH AMERICAN FLORA [VoLuUME 15 
Cells of the leaf just above the alar ones with thickened pitted walls, 
except the narrow marginal cells. 
Costa scarcely excurrent or for the length of 3 or 4 cells only, not 
forming a slender terete point; leaf-blade above 3 or 4 cells 
wide to near the apex. 
Leaf-cells of blade above the pitted lower cells in rows, more 
or less angular and short, not obliquely oval. 28. C. erctocarpus. 
Leaf-cells of blade above the pitted basal cells not in 
regular rows, mostly obliquely oval or narrow and much 
elongate. 29. C. cubensis. 
Costa excurrent into a terete rough point; leaf-blade only one 
or 2 cells wide for some distance below the apex. 30. C. Herrisi. 
Plants commonly sterile, the sporophytes unknown. 
Plants robust; leaves 12-18 mm. long; costa lamellose, 4004 wide. 31. C. tortuosus. 
Plants of medium size; leaves 6 mm. long or less; costa up to 225 wide. 
Costa with lamellae 2 or 3 cells high on the back; leaves serrate 
about one half down. 32. C. bermudianus. 
Costa without lamellae; leaves entire except at the apex. 33. C. guadelupensis. 
1. Campylopus Schimperi Milde, Crypt.-F1. Stid-Tirols (Bot. Zeit. 
Beil.) 13. 1864. 
Campylopus frigidus Lesq. in Porter & Coult. Syn. Fl. Colo. 155, in part. 1874. 
Leptotrichum tomentosum Kindb. Ottawa Nat. 7:18. 1893. 
Plants in compact tufts, 2-3 cm. high, with stems reddish-tomentose below and yellowish- 
brown at the summit, bearing few, erect branches: leaves about 3 mm. long, uniformly placed 
along the stems, closely appressed when dry, more or less spreading when moist, gradually 
lanceolate from an oblong base, tubulose above, entire on the margin to near the apex, which 
usually bears a few somewhat clustered teeth; costa excurrent nearly one half its length, more 
or Jess ribbed on the back, about 120 » wide near the base and extending two thirds across the 
leaf-base, without stereid-bands, in cross-section showing a row of large, thin-walled cells on the 
ventral side with 2 or 3 rows of smaller cells beneath; alar cells red to hyaline, the cells just 
above pale, thin-walled, rectangular, toward the margin very narrow, farther up all more or less 
oblong to oval and rhomboidal with slightly thickened, scarcely or not pitted walls (; perichaetial 
leaves half-sheathing, abruptly narrowed to an awl-shaped point: seta pale, 5 mm. long, at first 
bent downward, finally erect: capsule ovate, furrowed; lid with a beak half as long as the 
capsule; annulus broad; peristome small, the teeth split to the middle: spores 21-24 » in 
diameter, finely papillose —Juratzka, Laubm. 55). 
Type Locality: Europe. 
Distr1BsuTION: Greenland; St. Paul Island, Alaska; Rocky Mountains of Colorado; also in 
urope. 
2. Campylopus Chrismari (C. Mill.) Mitt. Jour. 
Linn. Soc. 12: 88. 1869. 
Dicranum areodictyon C. Mill. Syn. 1: 394, in part. 1848. 
Dicranum Chrismari C. Mill. Bot. Zeit. 13: 761. 1855. 
Dicranum destructile C, Mill. Bot. Zeit. 17: 220. 1859. 
Dicranum friabile Hampe; C. Miill, Bot. Zeit. 17: 220, 1859. 
Dicranum Krauseanum Hampe & Lorentz; Hampe, Bot. Zeit. 27: 434. 1869. 
Campylopus destructilis Jaeger, Ber. St. Gall. Nat. Ges. 1870-71: 430. 1872. 
Campylopus friabilis Jaeger, Ber. St. Gall. Nat. Ges. 1870-71: 432. 1872. 
Campylopus poasensis Ren. & Card. Bull. Soc. Bot. Belg. 31): 148. 1893. 
Plants in compact tufts, up to § cm. or more high, with stems often branched above and 
more or less tomentose below: stem-leaves erect-spreading all round or somewhat curved- 
secund, 5—7.mm. long, from a lanceolate or ovate-lanceolate base extending into a long, tubu- 
lose nearly smooth point with a denticulate apex; costa one half to three fifths the width of the 
leaf-base, widening upward for a short distance, then tapering to the long-excurrent point with 
more or less prominent, smooth ribs on the back, in cross-section one half down showing a row 
of large cells on the ventral side extending about one half through, with a band of two or three 
rows of medium-sized cells on the dorsal side with thin walls or becoming somewhat uniformly 
thickened with age; alar leaf-cells few, pale-brown or hyaline, fragile, the cells just above 
pale, thin-walled, more or less rectangular, broad toward the costa, narrow and elongate at 
the margin, forming a distinct border, the two forms merging above into shorter, irregular 
mostly rather thin-walled cells; perichaetial leaves rather shorter than the upper stem-leaves, 
