Part 2, 1913] DICRANACEAE 187 
the inner ones convolute more than one half up and abruptly narrowed to a slender subula, 
denticulate at the apex: seta 12-15 mm. long, smooth, sinuous above when dry: capsule oblong, 
about 2 mm. long, slightly or not curved, deeply furrowed when dry and empty, with a large 
annulus and a rostrate lid two thirds as long as the capsule; exothecal cells narrow, mostly 4 or 
5 times as long as broad, with much thickened lateral walls and thin end-walls 5 peristome-teeth 
dark-red, closely articulate and striate below, divided to below the middle: calyptra not ciliate 
at the base: spores slightly rough, up to 13 » in diameter. 
‘TYPE LOCALITY: Mexico. 
DISTRIBUTION: Mexico, Costa Rica, and Guatemala; high alpine. 
. This species is much like C. areodictyon (C. Miill.) Mitt., of northern South America, but dis- 
tinguished at once by the cross-section of the costa, C. areodictyon having a stereid-band both above 
and below the median row of cells; it also has longer, narrower cells in the upper part of the short 
leaf-blade. The ribs on the back of the costa in C. Chrismari vary greatly, sometimes being very 
prominent, at other times scarcely distinct, in specimens from the same tult. : 
3. Campylopus delicatulus R. S. Williams, sp. nov. 
Flowers and fruit unknown: plants in loose, green mats, with very slender, erect, simple 
stems 12-15 mm. high, bearing rather distant, nearly straight, widely spreading leaves rather 
uniformly placed along the stem and of nearly the same size below as at the apex of the stem; 
stem in cross-section oval-hexagonal, 200 » by 130 u, with a large central strand and walls of 
mostly 2 or 3 layers of small, thick-walled cells: leaves about 3.5 mm. long, narrowly lanceolate, 
tapering from near the base to a subtubulose point often sharply denticulate at the apex formed 
by the shortly excurrent costa; costa smooth on the back to a little below the apex, about 160 % 
wide at the base and one third the width of the leaf-base, in cross-section below showing 12-15 
large median cells with an equal number of large cells in one row on the upper side and about 
2 rows of smaller cells on the under side, with no stereid-band; -alar cells forming a large group, 
hyaline to reddish-brown and more or less inflated, extending to the costa; cells just above the 
alar ones often nearly square, about 20 « wide, soon becoming narrower and elongate, mostly 
prosenchymatous, with somewhat thickened, not pitted walls, the median cells of the blade 
4-6 u wide and up to 40-50 u long. 
Type collected at Herradura, province of Pinar del Rio, Cuba, August 27, 1910, E. G. Britton 
6523 (herb. N. Y. Bot. Gard.). 
DIsTRIBUTION: Pinar del Rio, Cuba. 
4, Campylopus saxatilis R. S. Williams. sp. nov. 
Plants in rather pale-green tufts, tomentose within, about 3 cm. high: leaves mostly 
uniformly placed along the stems, erect-spreading, flexuous, about 5 mm. long, from an ovate 
or lanceolate base gradually narrowed to a long, slender, serrulate apex, the narrow leaf-blade 
extending far above the middle; costa about 250 « wide below and one half the width of the 
leaf-base, in cross-section showing large cells on the ventral sidewxtending one third through 
and a median row of much smaller cells with a stereid-band below; alar cells red to hyaline, the 
‘cells at the margin just above hyaline, narrowly rectangular, those within broader, mostly 
short-oblong with thickened walls slightly pitted, those farther up all shorter, more or less 
obliquely oblong to rhomboidal with rather uniformly thickened walls; inner perichaetial 
leaves about 7 mm. long, with a convolute base extending one half up and gradually narrowed to 
a serrulate subula: seta flexuous, smooth, 10 mm. long: capsule without lid 1.25 mm. long, 
curved-ovate, nearly smooth at the base, furrowed when dry, distinctly strumose, with an 
obliquely rostrate lid 1 mm. long; peristome-teeth about 55 4 wide at the base; annulus large: 
ccalyptra not ciliate: spores rough, up to 16 » in diameter. 
Type collected at Cinchona, Jamaica, on rock at about 1500 meters, March, 1907, Harris 11143 
<herb. N. Y. Bot. Gard.). aad : 
DIstTRIBUTION: Known only from the type locality. 
5. Campylopus cygneus (Hedw.) Brid. Bryol. Univ. 1: 475. 1826. 
Dicranum cygneum Hedw. Sp. Musc. 148. 1801. : 
Campylopus jamaicensis Mitt. Jour. Linn. Soc. 12: 82. 1869. 
Pilopogon jamaicensis Broth. in E. & P. Nat. Pfl. 13: 336. 1901. 
Plants in rather loose tufts, with slender, more or less branching, sparsely radiculose stems 
up to 4 cm. high; stems rather equally foliate or somewhat comose above: upper leaves about 
