88 NORTH AMERICAN FLORA [Volume 15 
base and more abruptly narrowed to the slender, more or less sinuous and denticulate point: 
seta yellowish, flexuous, up to 12 or rarely 16 mm. long: capsule short-oval, slightly curved, 
nodding, strumose, ribbed when dry, with an imperfect annulus of one row of pale, hardly 
cohering cells that remain more or less attached to either the lid or the capsule; lid convex, 
obliquely rostrate; exothecal cells slightly transversely elongate in three or four rows just below 
the mouth, farther down greatly elongate with sinuous, thickened walls; peristome-teeth 
60-70 « wide at the base and 300 high or more, striate, divided about one half down into 
mostly two striate forks, with the basal membrane not projecting: spores slightly roughened, 
16-20 » in diameter. 
TYPE LOCALITY: Near Berlin, Germany. 
_ DISTRIBUTION: Arctic America to New York and New Jersey in the East and to British Colum- 
bia in the West j also in Europe. C4A 
Intustrations: Hedw. Deser. 2: pl. 29b; 3: pl. 37a. at os 
Exsice.: Sull. Musci Allegh. 167; Sull.-& Lesq. Musci Bor. Am. 49; ed. 2. 65, 66,in part; 
Macoun, Can. Musci 476. 
14. Dicranella Perrottetii (Mont.) Mitt. Jour. Linn. 
Soc. 12: 35. 1869. 
Dicranum Perrottetit Mont. Ann. Sci. Nat. II. 19: 241. 1843. 
Dicranella flava Besch. Ann. Sci. Nat. VI. 3: 181. 1876. 
Plants in yellowish or brownish-green tufts; stems up to 2.5 cm., rarely 4 cm. high, often 
branching: stem-leaves erect-spreading, often curved-secund, the lower from a lanceolate base 
gradually narrowed to a stout nearly entire point with a narrow blade extending to the apex, the 
upper and perichaetial leaves larger, from an ovate, somewhat clasping base, more abruptly 
narrowed to the entire or slightly denticulate apex, with the leaf-blade very narrow above, 
sometimes not distinct; costa stout, 80-100 « wide at the base, about one fifth the width of the 
leaf-base, vanishing just below the apex in the lower leaves and often slightly excurrent in the 
upper leaves; lower leaf-cells in the stem-leaves elongate-rectangular, colored, the upper cells 
shorter, about 6 » by 12 u, the perichaetial leaves with the lower cells much larger, paler, often 
irregular: seta somewhat flexuous, often not twisted, yellowish, about 12 mm. long: capsule 
short-oval to oblong, more or less nodding, not furrowed, with a large annulus and an obliquely 
rostrate lid; exothecal cells up to 25 » wide and from scarcely elongate to about twice as long as 
broad; peristome-teeth about 50» wide and 225-275 » high, mostly divided more than two 
thirds down into unequal forks, vertically striate below, papillose and pale above, from a low 
basal membrane scarcely evident above the mouth of the capsule: spores minutely papillose, 
up to 16 uw in diameter. 
Type LocaLity: Guadeloupe. 
DistTRIBUTION: Jamaica; Guadeloupe; Martinique. 
ILLustrRation: Ann. Sci. Nat. II. 19: pl. 8, f. 1. 
Exsicc.: Husnot, Pl. Ant. 126. 
15. Dicranella Harrisi (C. Miill.) Broth. in KE. & P. Nat. 
PA. 1°: 309. 1901. 
Angstroemia Harrist C. Miill. Bull. Herb. Boiss. 5: 554. 1897. 
Microdus Harrisi Paris, Index Bryol. Suppl. 244. 1900. 
Plants in rather compact, dull, yellowish-green cushions; stems about 8 mm. high, mostly 
simple: stem-leaves somewhat distant, short below, gradually larger upward, from a scarcely 
clasping, ovate base rather abruptly narrowed to a somewhat incurved-spreading limb with an 
indistinct blade or none above and a mostly denticulate apex; costa at base 60-100 » wide; 
leaf-cells below narrowly rectangular, colored, with walls slightly thickened, above much 
smaller and indistinct; perichaetial leaves up to 4 mm. long, from a broad, clasping, sometimes 
obovate base, abruptly narrowed to a slender, terete, flexuous limb without a distinct lamina 
above and denticulate at the apex: seta yellow, or finally reddish, about 8 mm. long: capsule 
oval, about 1 mm. long, nearly erect and symmetric, sometimes slightly strumose at the base, 
furrowed when dry; exothecal cells irregular, 20 » wide and mostly less than twice as long; lid 
obliquely rostrate, about as long as the capsule; annulus large; peristome-teeth 250-3504 
