62 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
species name under Polypodium by Swartz (in 1801) for a plant now known as Dryop- 
teris serrulata. The synonymy will be indicated in full in some notes on Polypodium 
duale and related species, to be published in the next paper of this series. Two other 
species names! subsequently applied are not valid under Polypodium. 
Polypodium heterotrichum Baker. 
A rare species hitherto recorded, apparently, only from Jamaica, where it occurs 
on trees in the higher forested slopes of the Blue Mountains, at 2,100 meters. Speci- 
mens have been received recently from Barranca Trinidad, State of Hidalgo, Mexico, 
May 10, 1904 (Pringle 13494). 
Polypodium jenmani Underw. nom. nov, 
“Polypodium lasiolepis” Jenman, Bull. Bot. Dept. Jamaica II. 4: 118. 1897, not 
Mett. 1869. 
The Jamaican plant described by Jenman as ‘‘ Polypodium lasiolepis Mett.’’ is not 
very closely related to P. lasiolepis of the Lesser Antilles, which is itself (together 
with P. grenadense Jenman) apparently a synonym of P, tenuiculum Fée. Jenman’s 
description is very complete. He compares the species with P. pendulum Swartz, 
pointing out, in part, that it differs from that species in its stronger rhizome, close and 
more decurrently adnate, ciliate segments, slightly hairy surface, terminal superficial 
sori, absence of glands, and different apex and base. He adds: ‘‘It is also ereet in 
growth, and the veins and midrib of the pinne are not raised on the upper side.”’ 
As a matter of fact, the relationship to P. pendulum is not very close, but that is a 
species very much misunderstood. 
The following specimens of P. jenmani are in the National Herbarium: 
Jamaica: At base of tree, slopes above Tweedside, altitude about 900 meters, 
Maxon 961. On trees, near Mabess River, altitude 900 meters, Maron 1535 
(= Underwood 2606). 
Polypodium leptostomum Fée, Mém. Foug 7: 58, pl. 2. f. 2. 1857. 
?Polypodium productum Maxon, Contr. Nat. Herb, 18: 11. 1909, not Christ, 1907. 
In assigning the name P, productum to a supposed new Guatemalan species in 1909 
the writer overlo»ked the earlier use of this name for a Philippine species by Christ.? 
A new name for the Guatemalan plant does not appear necessary at present, however, 
inasmuch as it resembles very closely P. leptostomum Fée, founded upon plants from 
Orizaba (W. Schaffner 210) and may prove identical with it. Specimens of the type 
collection bave rot been seen by the writer. 
' Micropteris orientalis Desv. Mém. Soc. Linn. Paris 6: 217. 1827, not P. orientale 
Gmel, 1791. Xiphopteris extensa Fée, Mém. Foug. 11: 14. 1866, not P. extensum 
Forst. 1786. 
* Philippine Journ, Sci. C. Bot. 2: 178. 1907. 
