276 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
half winged narrowly both above and below, finally fully adnate; the margins dis- 
tinctly and uniformly shallow-crenate throughout; midvein prominent, giving rise 
to about 40 or 45 pairs of mostly 3-forked, free, oblique veins; sori, about 40 pairs, 
borne at half the distance to the margin. 
Specimens examined: 
Mexico: Chiapas, Ghiesbreght, 1864-1870, no. 244 in part (G, E—2 specimens); 
no. 205 (E—2 specimens). 
Guatemala: Santiago, Dept. Zacatepequez, altitude 6,500 feet; Rosalio Gomez, 
1891, John Donnell Smith’s distribution no. 945 (G, N, 8). 
Of these the first mentioned (in the Gray herbarium) may stand as the type. The 
full-page illustration accompanying is quite representative of the species, which in 
general appearance stands almost exactly between P. subpetiolatum and P. fraternum. 
From the former it is distinguished by its size, by the uniformly crenate (instead of 
irregularly serrate) margins, and by the slender shape of the pinne; from the latter 
by its membranaceous (instead of decidedly coriaceous) texture, entirely free vena- 
tion, shorter-petiolate pinnze, regularly crenate (instead of undulate) margins, and 
by its pubescence. The pubescence is, however, inconspicuous in the plants studied; 
above it is a short, matted tomentum, confined to the midveins of the upper pinnee 
and to the terminal portion of the rachis; on the under side it is slight and to be 
observed only along the lower portions of the midveins, There is in the Gray 
herbarium an additional sheet from Chiapas, collected by Dr. Ghiesbreght (no. 260), 
which may or may not belong to this species. It is decidedly pubescent. 
Fée’s P. cubense@ is, I believe, not known in American herbaria, It is, apparently, 
related closely to the species here described, but both description and figure represent 
a plant differing in several essential particulars. 
Polypodium fraternum Cham. & Schlecht. Linnea 5: 608. 183 . 
This species is well diagnosed by its authors, It appears to be rather variable, but 
is distinguished at once by the very coriaceous texture, long-petiolate, perfectly 
glabrous pinne, subundulate nearly entire margins, and somewhat anastamosing 
venation. 
It does not appear to have been much collected, and I have seen only the follow- 
ing specimens: 
Specimens examined: 
Vera Cruz: Near Jalapa, J. N. Rose, August 13, 1901, no. 6088 (N); near Ori- 
zaba, on oaks, C. G. Pringle, January 20, 1895 (G). 
State of Mexico: Borrego, Bourgeau, April 14, 1866, no, 2881 (G), 
Guatemala: Santa Rosa, Dept. Baja Vera Paz, altitude 5,000 feet, H. von Tiirck- 
heim, July, 1887, John Donnell Smith’s distribution, no, 1291 (8). 
“Gen. Fil, 241, 1850-1852; 7™* Mém. 61. pl. 26. f. 1, 1854. 
