588 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
Valley of the Rancho Redondo, alt. 2,000 meters, Pittier 1120. Alto de 
Ochomogo, alt. 1,550 meters, Tonduz 10394 (bipinnatifid form), With- 
out locality, Wercklé (bipinnatifid form, ex herb. Christ). Without 
locality, Cooper. 
JAMAICA: Near or just below Cinchona, alt. 1,500 meters or less, Clute 144; 
Hart 51; Underwood 1629, 3245. 
CoLtomBIA: Near Medellin, Charetier 40. 
VENEZUELA: Campo Alegre, Hggers 13416. Without locality, Fendler 252. 
Peru: Without locality, Ruiz 4549. Hacienda Limén, Osgood 64. 
Borivia: Sorataé, alt. 8,900 meters, Rusby 344. 
7. Polypodium argentinum Maxon, sp. nov. 
Rhizome epigean, creeping, 1.5 to 2 mm. in diameter, copiously radicose be- 
neath, closely covered with appressed widely imbricate scales, these 2 to 2.5 mm. 
long, oblong to narrowly deltoid-oblong, acute or acuminate, attached above the 
rounded base, pale brown in mass, bicolorous singly, the narrow median portion 
falling short of the apex, subopaque (the cells linear-oblong, acutish, with red- 
dish brown outer walls, the partition walls not strongly sclerotic), the wide 
borders pale, almost transparent, each consisting of 3 to 5 rows of oblique, short 
or transversely linear, thin-walled cells, the margins subentire, minutely erose- 
crenulate. Fronds several, 8 to 10 cm. long, erect or arcuate, subfasciculate, 
borne 2 to 4 mm. apart; stipes 2.5 to 4 cm. long, pale brown, flattish, 1 to 1.2 
mm. broad, narrowly bisulcate upon the anterior face, scantily paleaceous, the 
scales subappressed ; lamina lance-oblong, 4 to 6.5 cm. long, 1.5 to 2.5 em. broad 
above the base, pinnatifid throughout to within 2 mm. of the broad concealed 
costa; segments 8 to 10 pairs below the acuminate subcaudate apex, slightly 
ascending, the lower and middle ones nearly equal, oblong to linear-oblong, 1 to 
1.5 cm. long, 3 to 4 mm. broad, rounded-obtuse, close, the sinuses linear, appear- 
ing broader from the contraction of the strongly coriaceous leaf tissue in dry- 
ing, the margins entire, closely revolute; apical segments gradually shorter, the 
uppermost ones rounded-triangular ; midveins of the segments impressed above, 
partially concealed beneath; veins of larger segments about 7 pairs, mainly 
joined, subgoniophlebioid, forming a single series of broad oblique areoles upon 
either side, these extending nearly to the margin, with several very short excur- 
rent branches and a single included veinlet, the latter fertile at its extremity; 
sori 5 to 7 pairs, large, nearly medial, slightly concealed by the scales of the 
lower surface, these numerous, contiguous or subimbricate, pale brown, about 
1 mm. long, broadly deltoid-ovate, acute or acuminate, peltate, firmly attached 
above their base, clathrate, nearly homogeneous, the cells mostly short, subhex- 
agonal, with sclerotic yellowish brown partition walls and transparent outer 
walls, the outer 1 or 2 rows transversely linear or linear-oblong, thin-walled, 
the margin of the scale minutely denticulate. 
Type in the U. 8. National Herbarium, no, 691518, collected from rock clefts 
in the Sierra Ventana, Province of Buenos Aires, Argentina, March 3, 1881, by 
P. G. Lorentz. 
The type specimens consist of two plants, received from Berlin, determined as 
Lepicystis macrocarpa. They are, however, far removed from P. pycnocarpum 
(P. macrocarpum Presl), not only by their widely different scale structure but 
likewise by their gross morphology and subgoniophlebioid venation. From 
small plants of true P. tweedianum they are immediately distinguished by 
their subgoniophlebioid venation, entire segments, coriaceous (not membrano- 
herbaceous) texture, and nonrepand rhizome scales, which, also, are of different 
structure. Although placed here among the species with anastomosing veins 
P. argentinum is nevertheless nearest related to the species of the plebejum 
