Jamesoniane. N. O, Filices. 
TAB. DCCXX. 
Po.ypopium (MAre@tNarRia) puNcTULATUM. Hook. 
Candice repente crasso dense fusco-squamoso squamis lanceo- 
lato-subulatis, fronde stipitata oblongo-ovata caudatim acuml- 
nata coriaceo-membranacea glabra profunde fere ad rachin 
pinnatifida, laciniis horizontaliter patentibus lineari-lanceolatis 
obtusis marginatis integerrimis supra punctatis nudis subtus 
in costis parce paleaceis, soris prope costam utrinque unl- 
seriatis in singula areola solitariis, stipite frondem e#quante 
compresso hinc plano nudo. 
Has. Andes of Quito. Prof. W. Jameson, n. 127. 
This belongs to that group of the genus Polypodium called 
Marginaria by Pres), and by Bory, who established the genus, 
as it would appear, upon the Polyp. incanum of Linneus, 
but without taking the venation into account, which in that 
particular species is most difficult of detection. Its essential 
character is to have the sorus at the end of a veinlet, situated 
within a large 6-sided areola near the costa, formed by a union 
of the veins, as shown in our figure. This structure is best seem 
in the present instance by holding the specimen between the 
eye and the light, when the veins are quite pellucid. Whether 
this structure of the veins be considered of generic avail or not, 
it is a valuable aid in the grouping and distinguishing species; 
for this difference of venation is not always accompanied we 
difference in habit: many resemble the present species which 
belong to true Polypodium. Mr. J. Smith unites Marginaria 
with Goniophlebium. I have derived the name of the present 
species from the pale dots on the upper surface, which correspond 
with the receptacles of the sori beneath. 
Fig. 1. Portion of a segment with sori :—magnified. 
