548 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
7. Polypodium caucanum Hieron. Bot. Jahrb. Engler 34: 508, 1904. 
TYPE LocaLity: Trunks of trees in humid forests near the Rfo Dagua, 
Province of Cauca, Colombia, altitude 2,300 meters (Lehmann 8257). 
DISTRIBUTION: Nicaragua, Panama, Colombia, British Guiana, and Ecuador ; 
ascending to 2,300 meters, 
This species and Polypodium cookii are the only long-setose allies of P. 
trichomanoides in America which have the veins wholly simple. In P. cau- 
canum the veins are merely arcuate, the small sorus being borne at a point 
a little less than half the distance from the base; in P. cookii they are genicu- 
late at the sorus. The leaf tissue of both plants is rigidly herbaceo-coriaceous. 
The following specimens are in the U. §. National Herbarium: 
Nicaracua: Without locality, Wright. 
PANAMA: Humid forests of the upper Caldera watershed, between Camp I 
and the Divide, Holcomb’s trail, above El Boquete, Chiriquf, alt. 1,650 
to 1,925 meters, Maxon 5657. 
BriTIsH GuIANA: Upper slope of Mount Roraima, im Thurn 178. “Old 
Path,” Mount Roraima, im Thurn 348. 
8. Polypodium grisebachii Underw. in C. Chr. Ind. Fil. 531. 1906. 
Polypodium exiguum Griseb. Fl. Brit. W. Ind. 701. 1864, not Heward, 1888, nor 
Fée, 1869. 
TYPE LOCALITY: Summit of Blue Mountains, Jamaica, on trees (Purdie). 
DistRInUTION: Higher peaks of the Blue Mountains, Jamaica, at 1,800 to 
2,220 meters elevation; also in Martinique and Guadeloupe. 
There is little to add to Hieronymus’s excellent descriptive notes upon this 
species (which was wrongly taken up by him under the invalid name Poly- 
podium exiguum Griseb.), except that the rhizome scales are not invariably 
ovate, but range to oblong-ovate or even linear-oblong. In Jamaica it occurs 
only upon the highest peaks and ‘usually grows Closely entangled in the deep 
mossy covering of forest trees. 
The following specimens are in the U. S. National Herbarium: 
JAMAICA: Summit of Blue Mountain Peak, alt. 2,220 meters, Maron 1512 
(=Underwood 2580). Monkey Hill (above New Haven Gap), alt. 
1,800 meters, Maron 2751. Sir Johns Peak, alt. 1,850 meters, Under- 
wood 3191. Locality not stated, Hart 74. 
MARTINIQUE; Sommet de la Calabasse, ete., Duss 1655. 
9. Polypodium perpusillum Maxon, Contr. U. S. Nat. Herb. 17: 409. 1913. 
TYPE LOCALITY: Serra de Caraca, Minas Geraés, Brazil (Ule). 
DISTRIBUTION : Known only from the original specimens, 
ILLUSTRATION : Contr. U. 8S. Nat. Herb. 17: pl. 13. A, 
At its place of publication this species was compared with P. grisebachii, 
which is perhaps its nearest relative, neither species being really of very close 
alliance to P. trichomanoides. Polypodium perpusillum is somewhat anomalous 
in its venation. Some fronds have most of both the fertile and the sterile veins 
simple, the receptacle of the sorus being evident as a slight protuberance about 
midway upon the upper side of the vein; others, which presumably represent a 
more mature state of the species, have some of both the fertile and the sterile 
veins forked. The species may, therefore, be placed here, rather than with 
P. hartii, P. limula, and P. nutatum, species which it does not at all resemble 
habitally. ; 
10. Polypodium mitchellae Baker in Hemsl. Biol. Centr. Amer. Bot. 3: 664. 
1885, 
TYPE LOCALITY: Orange Walk, British Honduras (Mrs. Mitchell). 
