554 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
22. Polypodium hyalinum Maxon, Contr. U. S. Nat. Herb. 17: 406. 1913. 
TYPE LocaLity: Upper forested slopes of the Volein de Barba, Costa Rica 
(Pittier 1928). 
DISTRIBUTION: Known only from the original collection. 
This species was fully compared with its allies at the original place of 
publication, 
23. Polypodium setulosum Rosenst. Repert. Nov. Sp. Fedde 10: 277. 1912. 
TYPE LOCALITY: El General, Costa Rica, altitude 656 meters. 
DISTRIBUTION : Known only from Costa Rica. 
The type of P. setulosum, collected by Tonduz, is Jiménez’s no, 214, of which 
there are three fronds in the National Herbarium. The species is adequately 
described except as to venation. The veins of the sterile segments are either 
simple or forked below the middle, the proximal branch oblique and decidedly 
longer than in related species. The veins of the fertile segments are invariably 
forked, the very oblique proximal branch being fertile near its base and almost 
equaling the distal branch. Minute branched glandular hairs, similar to those 
of P. trichomanoides, P. serricula, and P. basiattenuatum, are borne sparingly 
upon the under surface of the leaf. 
The following additional specimen, which is larger and not altogether typical 
in venation, is referred provisionally to this species: 
Costa Rica: San Cristébal, Wercklé (ex herb. Jiménez). 
24. Polypodium nimbatum Jenman, Journ. Bot. Brit. & For. 24: 271, 1886. 
PLATE 87. 
TYPE LOCALITY: Jamaica. 
DISTRIBUTION: Mountains of Jamaica and Cuba, at 1,020 to 1,500 meters alti- 
tude; rare. 
A small species with stout rhizomes and numerous densely tufted, short, nar- 
row fronds, Somewhat suggesting a reduced state of P. truncicola, from which 
it differs widely in venation and position of sori. Although grouped with P. 
taenifolium and P. blepharodes in the artificial key it has only a remote 
relationship to these species. 
The following specimens are in the U. 8. National Herbarium: 
JAMAICA: Without definite locality, the collector’s name not stated (ex 
herb. Dept. Agric. Jamaica; determined by Jenman as P. nimbatum). 
Rose Hill, W. Harris, March 12, 1895 (determined by Jenman as P. 
nimbatum). Hardware Gap, July 80, 1907, Fisher 157. 
Cuna: Without precise locality, Wright 1049 (fragments from specimens 
in the Gray Herbarium). Jiguarito Mountain, Sierra Maestra, alt. 
1,020 meters, September 18, 1906, Taylor 540. 
EXPLANATION OF PLATE 37.—Specimens of Polypodium nimbatum: A, one of five Jamai- 
ean specimens (probably the type collection) marked Polypodium nimbatum by Jenman, 
received from Herbarium of the Department of Agriculture, Jamaica; B, Wright’s no. 
1049, from Cuba, in the Gray Herbarium. Both natural size. 
25. Polypodium blepharodes Maxon, Contr. U. 8S. Nat. Herb, 17: 407. 1913. 
Type LocaLity: Vicinity of La Palma, Costa Rica, altitude 1,450 to 1,550 
meters, on tree stump at border of forest (Maron 406). 
DISTRIBUTION: Mountains of Panama, Costa Rica, and eastern Guatemala, 
ascending to 1,650 meters. 
The relationship of P. blepharodes has previously been treated, with citation 
of the numerous specimens in the U. 8. National Herbarium. The following ad- 
ditional collections may be listed: 
Costa Rica: Trail from San Ramén to Esparta, alt. 1,200 to 1,400 meters, 
Brénes 14214. Santiago, near San Ramon, alt. 1,200 to 1,300 meters, 
Brénes 14212. 
