142 NORTH AMERICAN FLORA [VoLumE 15 
16. Campylopus Underwoodii R. S. Williams, sp. nov. 
Plants in compact, yellowish-green, glossy tufts; stems up to 12 cm. high, scarcely or not 
branched, slightly radiculose below: leaves uniformly placed along the stems, erect-spreading 
all around, 10 mm. long, tubulose below, from a lanceolate base gradually narrowed to a 
flexuous, filiform point, very smooth except at the minutely denticulate apex; costa just above 
the alar cells about 500 » wide, more than three-fifths the width of the leaf-base, smooth on the 
back with a very narrow leaf-blade extending five-sixths up or more, in cross-section showing 
ventral cells extending nearly two thirds through the leaf with a stereid-band below enclosing 
two rows of small cells; alar cells conspicuous, red to hyaline, the cells just above, toward the 
costa, short and broad with walls thickened at the angles, those toward the margin gradually 
much narrower and paler with thin walls; cells farther up becoming somewhat obliquely 
elongate and gradually smaller with rather uniformly thickened not pitted walls. 
Type collected on Blue Mountain Peak, Jamaica, April, 1903, Underwood 2539 (herb. N. Y. 
Bot. Gard.). iis 
DISTRIBUTION: Known only from the type locality. 
17. Campylopus angustiretis (Aust.) Lesq. & James, 
Man. 80. 1884. 
Dicranum angustirete Aust. Bot. Gaz. 4: 150. 1879. 
Plants in rather loose, green to brownish tufts; stems mostly simple, about 3 cm. high, 
without radicles above: leaves nearly straight, equally spreading all around, rather loosely 
imbricate below, more or less comose at the summit, the lower ones 3.5—-4 mm., the upper about 
5 mm. long;. costa just above the alar cells 150 « wide or more, shortly excurrent into a dentate 
point, slightly ribbed on the back, in cross-section showing a row of thin-walled cells on the 
ventral side, a median row of cells nearly as large, and a stereid-band below; alar cells pale- 
reddish to hyaline, the cells just above broad, short, often nearly square toward the costa, 
much smaller and narrower toward the margin, in the upper part of the leaf becoming nar- 
rowly oblong or rhomboidal to linear and slightly vermicular, 4-64 wide and about 30, 
long, with rather uniformly thickened walls, not in straight rows. 
° Type Locanity: Jacksonville, Florida. 
DISTRIBUTION: Known only from the type locality. 
18. Campylopus leucogaster (C. Miill.) Mitt. Jour. 
Linn. Soc. 12: 75. 1869. 
Dicranum leucogaster C. Mill. Syn. 1: 387. 1848. 
Dicranum filiforme Hornsch.; C. Miill. Syn. 1: 387, as synonym. 1848. 
Plants in laxly cespitose tufts; stems somewhat elongate, simple, caudate, flexuous, soft, 
flaccid, yellowish, subfiliform but lax-leaved: stem-leaves at the apex, forming a somewhat 
elongate, erect, spreading, slightly compressed coma, erect-spreading from a broadish base, 
lanceolate-subulate, somewhat curved, at the very apex on the back and margin serrulate, 
otherwise very smooth; alar cells very lax, large, hyaline, ventricose and delicate with basal 
cells lax and thin-walled, the cells above very minute; costa extending to the tip and filling 
almost the entire leaf above. (Translated from the original description.) 
TYPE LocaLity: Jalapa, Vera Cruz. 
DISTRIBUTION: Known only from the type locality. ‘‘By its caudate stems resembling D. por- 
phyreodictyon. Perhaps with stems of two forms.” (C. Miiller.) A stem from the type collection, 
received through the kindness of I. Urban, is filiform, a little more than 2 cm. high and with the 
appressed leaves about 0.5 mm. across; leaves up to 4 mm. long with cells empty and more or less 
collapsed, often giving a rough appearance to the back of the leaf; costa in cross-section with a 
ventral row of thin, large cells, sometimes almost entirely worn away, a median row of cells nearly 
as large, and a stereid-band below, of about two rows of cells. 
19. Campylopus Roellii Ren. & Card. Bull. Soc. Bot. 
Belg. 38!: 9. 1900. 
Plants densely cespitose, yellowish to rusty-green; stems erect, simple or divided, much 
attenuate, tomentose below, 1.5—2 cm. high: leaves about 5 mm. long, rather closely imbricate, 
