ET ir | CHARACTERS OF TRIBES AND GENERA. 
fertile usually contracted. Veins arcuately or angularly ` ` 
anastomosing. Receptacles punctiform, produced on the ` 
 eonfluent apices of two or more excurrent veinlets, ter- 
minating in the medial areoles, sometimes partially com- 
pital. Sori round or ovate, transversely uniserial, naked. 
Type. Polypodium lycopodioides, Linn. 
Illust. J. Sm. Ferns, Brit. and For., fig. 11. 
. Oss.—In venation and position of the sori the species of 
‘this genus agree with Pleopeltis, but their smooth, generally 
shining fronds and naked sori is sufficient to rank them as 
forming a distinct group. 
Sp. A. ovariensis (Desv.) (v v.); A. serpens (Sw.); 
A. lycopodioides (Linn.) (v v.); A. nitida (J. Sm.) (v v.) ; 
A. stigmatica (Pr. (v v.); A. squamulosa (Kaulf.) ` 
(v v.); A. geminata (Schrad.) (v v.) (Polypodium iteophyl- ` 
lum, Kze.) 1 | 
Oss.—With the exception of A. ovariensis, a native of 
West Tropical Africa, the species are all natives of es 
West Indies and Tropical America. 
32. MicrocramMa, Presl. (1836). 
Polypodium sp. auct. ; Hook. sp. Fil. l 
Node slender, branched. Fronds distant, rising — 
from a short branch-like node, elliptical] lanceolate, 4 to 8 ` 
. inches long, firm, membranaceous. Veins ‘irregular, com- ` 
_ pound anastomosing. Receptacles linear, compital, a 
.. oblique linear sori. 
~ Type. Polypodium persicariæfolium, Mayer. 4 
.. Tilust. Schk. Fil. p. 187, t. 8, C. ; Presl Tent. Pterid., t9, 
Ly: Hook and Bauer, Gen. Fil., t. 73 A. 
Ons -—This genus is founded by Presl upon a single 
species, native of Trinidad, Guiana, and Brazil. Tn Sue 
