112 CHARACTERS OF TRIBES AND GENERA. 
27. Lupicystis, J. Sm. (1841). 
Marginaria sp. Bory and Presl; Polypodium sp., auct. and 
Hook. Sp. Fil. 
Surculum short and rigid; slender. Fronds pinnatifid, 
6 to 18 inches high, densely covered with round or 
elongated fringed scales. Veins pinnately forked, anasto- 
mosing, lower exterior venules free, Receptacles punctiform, 
terminal on the free venules in the costal areoles, immersed. 
Sort protruding through the dense scales, transverse 
uniserial, 
Type. Polypodium incanum, Linn. 
Ilust. J. Sm. Ferns, Brit. and For., fig. 6. 
Oss.—In venation and position of the sori this genus 
agrees with Goniophlebiwm, but differs in the fronds being 
densely covered with elongated fringed scales, through - 
which the sporangia protrude in a manner analogous to 
being contained within a calyciform indusium. In general 
habit the species agree in the squamose nature of the 
fronds, which indicates its natural affinity to be with 
Polypodium macrocarpum and P. madrensea. 
Species. L. incana (Sw.) (v v.); L. lepidopteris (L. et F.) 
(v v.) ; L.. squamata (Linn.) (v v.); L. ragadiolepis (Fée) 
(vv) 
Natives of West Indies and Tropical America, extending 
to south of the United States to South of Brazil. 
28. PrEOPEUTIS, H. et B. (1810). 
Polypodium sp., auct.; Hook. Sp. Fil. : 
. Surculum elongating; slender. Fronds simple, sinuose 2 
(oF pinnatifid, 4 to 12 inches long, opaque, squamiferons, 
rarely smooth. Veins more or less obscure, arcuately snar- 
