﻿MAXON] NEW POLYPODIUM FROM JAMAICA 4 M 



P. nesiolicum is very distinct from both, but for the benefit of those 

 who have not material of these rare species the following notes may 

 be of use. 



/'. fawcettii is correctly said by Jenman to be "infrequent at 

 4,000 to 6,000 feet altitude in damp forests on the trunks and 

 branches of trees." Two numbers {2J2$, 2760) were collected in 

 such situations by the writer in 1903 and 1904. It is characterized, 

 briefly, by its dark villous slender conspicuously uprigh.1 rhizome, 

 numerous closely set small, very narrow fronds, and almost simple 

 veins, — the sori being' borne in two rows near the midvein, each upon 

 a short spur given off by the otherwise simple vein. In all thi se 

 characters the plant contrasts strongly with P. ncsioticum. 



P. dendricolum appears to be a very rare species. Professor 

 I'mlerwood states (in. litt.) that it is "represented at ECew only by 

 a tracing of the type," the type being presumably in the Herbarium of 

 the Jamaican Botanical Department at Kingston, Jamaica. There 

 is, however, a single frond from the type specimen preserved in the 

 Jenman herbarium at New York, and this agrees absolutely with two 

 other numbers of Jamaican specimens, viz.: one (without definite 

 locality), collected by D. E. Watt in 1903; and another, from the 

 slopes of Monkey Hill (above New Haven Gap), altitude about 

 1,800 meters, Maxon, no. 2736; both of which numbers are repre- 

 sented in the herbarium of the New York Botanical Garden and 

 the U. S. National Herbarium. This species is somewhat more 

 closely related to P. ncsioticum than is P. fazveettii. It is distin- 

 guished by its reduced stature (5 to 7 cm.), thicker texture, more 

 general villous covering, deeply scalloped (instead of undulate) 

 margins, simpler venation, and particularly (1) by having the mid- 

 vein covered on both surfaces by parenchyma, and (2) by what 

 Jenman calls " embossed receptacles," i. c, having the parenchyma 

 considerably raised (on the under surface) above the concealed 

 veins toward their extremities, thus imparting a marked rugose 

 effect to the under surface. The last character is sufficient in 

 itself to distinguish P. dendricolum at sight. 



The venation of P. ncsioticum is peculiar and shows an approach 

 to that of P. trifurcatum. It is well indicated in the accompanying 

 plate which has been prepared under the author's supervision bv 

 Mr. H. D. House. 



