New Ponryropitums FRoM TrRopPIcCAL AMERICA 35 
mate segments, these having obtuse tips. But other 
specimens are intermediate between these two extremes, 
and all forms seen agree closely as to the scales of the 
rhizome and under side of the lamina. 
In general aspect P. pleopeltidis resembles more P. 
madrense J. Sm. (P. ouloiepis Fée) than P. plebejum, 
but the scales are very different. It bas a more slender 
rhizome and the leaves are more distant than in the 
two Mexican species. Several specimens bear a row of 
white dots (CaCQ3) along the margins above the tips 
of the veins (hydathodes), a character not observed in 
the two species mentioned. 
Polypodium tobagense ©. Chr., sp. nov. 
Rhizome long-trailing, threadlike as in P. pilosel- 
loides, its scales with a long, hairlike, flexible apex. 
Leaves scattered, isomorphous or nearly so, on stalks 
scarcely 1 cm. long, entire, lanceolate, narrowed toward 
both ends (the apex acute), up to 10 em. long, about 1 
em. broad below the middle, subcoriaceous or mem- 
branous, dark-green above, grayish-green beneath. 
Seales of the surfaces minute, mainly like those of P. 
piloselloides, those of the midrib beneath rather numer- 
ous and large, lanceolate, red-brown. Venation and 
sori as in P. piloselloides. 
BRITISH WEST INDIES: Tobago, Belmont Road, 
Adelphi, running on a tree, W. E. Broadway no. 3615, 
January 24, 1910. 
Related closely to Polypodium piloselloides L., a 
simple-leaved species belonging to a group not treated 
in Mr. Maxon’s paper. It differs essentially from true 
P. piloselloides by its long, lanceolate fronds, the sessile 
and fertile ones being scarcely different as to shape and 
size, while in P. piloselloides the leaves are decidedly 
dimorphous. 
