﻿222 Maxon: Polypodium marginellum and its allies 



2. Polypodium leptopodon Wright, Trans. Linn. Soc. II. Bot. 

 6: 83. 1 901 



Type locality: Summit of Mt. Roraima, British Guiana, alti- . 

 tude about 2,620 meters. 



Distribution: Known only from the original collection {Mc- 

 Connell & Quelch 569). 



Polypodium leptopodon is a well-marked species, related to true 

 P. marginellum Swartz, with which it is contrasted in the preceding 

 key. In general form it is simulated somewhat by an occasional 

 specimen of P. marginellum in which the fronds are very numerous 

 and through crowding have developed uncommonly long and 

 slender stipes ; but it differs constantly in characters of pubescence 

 and rhizome scales. The sori, as usually also in P. marginellum, 

 are borne on the base of the elongate branch, the two veinlets 

 being subequal and terminating well short of the margin. 



Besides a specimen of the type collection sent from Kew the 

 writer has examined several plants of the same number in the 

 Underwood Herbarium of the New York Botanical Garden. No 

 other specimens have been seen, the species apparently being very 



3. Polypodium limbatum (F6e) Maxon 

 Grammitis limhata Fee, Gen. Fil. 233. 1852; Mem. Foug. 6: 6. 



1853. 



Type locality: Guadeloupe. 



Distribution: Guadeloupe, at 750 to 1,300 meters elevation; 

 also St. Vincent, at 600 meters. 



Illustration: Fee, Mem. Foug. 6: pi 5,/. i. 



This species, described originally upon specimens collected by 

 Perrotet, has been very imperfectly known and understood, 

 probably because of its rarity. Excellent Guadeloupe specimens 

 of the Duss collection in the Underwood Herbarium show it to be 

 amply distinct, however. Fee's illustration is excellent in all 

 particulars save one; namely, that the sori, while nearly medial 

 upon the veins, are not borne midway between the midvein and 

 margin, owing to the basal curvature of the veins. The relatively 

 pale scales, ligulate form of the exstipitate fronds, broad marginal 

 band, and position of the sori at once distinguish it from its nearest 

 ally, P. Hessii. 



