476 Best: REVISION OF THE 
Virginia (Vail and Britton) ; North Carolina (Sullivant) ; Georgia 
(Harper); Alabama (Mohr) ; Louisiana (Langlois). 
ExsiccaTaE: Drumm. Muse. Am. (S. States) 86 as Prerogonium 
filiforme, var.?; Austin, Musc. Appalach. 267; S. & L. Musc. 
Bor.-Amer., ed. 1, 245; ed. 2, 347; Ren. & Card., Musc. Amer. 
Sept. 85. 
ILLUSTRATION: Sulliv. Icon. Musc. p/. 78. 
As good fruiting material of Z. denticulata was not at hand, the 
somewhat imperfect description of the sporophyte was taken from 
Sullivant’s Icones Muscorum. The generic position of this species 
is open to question, as indicated by Sullivant in Mosses of the 
United States. The leaves in shape and areolation resemble those 
of the Fabroniae. The papillae on their dorsal surfaces appear to 
have escaped Sullivant’s notice. It is quite probable that when 
better understood L. denticulata will be assigned to some other 
genus. 
11. Leskea Williamsi sp. nov. 
Plants quite small, in spreading subshining tufts, pale yellow 
to golden brown; stems slender, creeping, radiculose, pinnately 
branched, 2-4 cm. long; central strand none ; branches ascend- 
ing, simple or with flagellate branchlets : lower stem-leaves decol- 
orate, roundish ovate, abruptly acuminate, costa short, nearly 
obsolete ; upper stem-leaves appressed when dry, erect-spreading 
when moist, straight or subsecund, entire or serrulate above, ovate- 
lanceolate, acuminate, acumen about as long as the concave 
biplicate body, 0.25-0.35 mm. wide, 0.4-0.5 mm. long; mar- 
gins recurved below or plane all around; costa short, thin, simple 
or bifid, scarcely reaching the middle ; branch-leaves smaller, 0.15- 
0.20 mm. wide, 0.25-0.4 mm. long; leaf-cells smooth, clear ; 
median linear-rhomboidal to fusiform, subvermicular, about 6 
wide, 3-5 times as long; alar quadrate to transversely oval, in 
about 4 rows, extending well up the margins and passing to oval- 
oblong: dioicous: perichetial bracts oblong-lanceolate, acuml- 
nate, striate-plicate, inner subvaginant ; pedicel smooth, flexuous, 
about 1 cm. long; capsule straight, erect or inclined, oblong- 
subcylindric, tapering at base; urn 2 mm. long, 0.7 mm. wide, 
brownish ; teeth reddish, incurved when dry, lanceolate, confluent 
at base, finely striate below, rugulose above, divisural line distinct, 
ventral surface lamellose ; endostomial band strongly reticulated, 
about one fourth the length of the teeth; segments narrow, con” 
cave-keeled, hiant, about as long as teeth; cilia none; annulus 0 
