FILICES. 621 
13. Pellea rigida, Hook. Sp. Fil. ii. p. 144; Hook. et Bak. Syn. Fil. p. 147; 
Fourn. Mex. Pl. Enum. i. p. 119; Eaton in Proc. Am. Acad. xviii. ‘P 187. 
-Pteris rigida, Swartz, Syn. Fil. pp. 104 et 299. 
Allosorus rigidus, Kunze in Linnea, ix. p. 55, et xiii. p. 187. 
‘Chetlopecton rigidum, Fée, 7° Mém. Foug. p. 33, t. 20. fig. 3. 
Pteris cartilaginea, Presl, Reliq. Henk. i. p. 57, t. 9. fig. 3. 
Pteris acutangula, Nees in Linnea, xix. p. 684. 
‘Cheilanthes rigida, Moore; Mett. Cheil. p. 48. 
Nortu Mexico 2, San Luis Potosi to Tampico (Parry & Palmer, 1156); Souta MxExico, 
region of Orizaba (Bourgeau, 2771), Trapiche de la Concepcion (Liebmann), Chiapas &c. 
(Ghiesbreght); GuateMaLa, Motagua valley (Godman & Salvin).—Prrv. Hb. Kew. 
14, Pellewa seemanni, Hook. Sp. Fil. ii. p. 141, t. 1178; Hook. et Bak. Syn. 
Fil. p. 145; Eaton in Proc. Am. Acad. xviii. p. 187; Fourn. Mex. Pl. Enum. 1 p. 119. 
NortH Mexico, Morales Mountains, San Luis Potosi (Schaffner, 923 ; Parry & Palmer, 
979), Mazatlan (Seemann, 1447). Hb. Kew. 
15. Pellwa skinneri, Hook. Sp. Fil. ii. p, 141, t. 118 8B; Hook. et Bak. Syn. Fil. 
p. 147. 
GUATEMALA, without locality (Skinner), Motagua valley ( Godman & Salvin). Hb. Kew. 
16. Pellzea (Allosorus) ternifolia, Link, Hort. Berol. p. 59; Hook. Sp. Fil. ii. 
p. 142, et Fil. Exot. t. 15; Hook. et Bak. Syn. Fil. p. 148; Fourn. Mex. Pl. Enum. i. 
p. 118; Eaton, Ferns N. Am. ii. p. 59, t. 54. figg. 1-3, et in Proc. Am. Acad. xviii. 
‘p. 187. 
Pieris ternifoha, Cav.; Hook. et Grev. Ic. Fil. t. 126. 
Pieris triphylla, Bert. non Mart. et Gal. ex Fourn. 
Pellea lanuginosa, Fée, 8° Mém. Foug. ex Fourn. 
Texas; New Mexico.—Norta Mexico, Escobrillos Mountains, San Luis Potosi 
(Schaffner, 924; Parry & Palmer, 982); Sovrn Mexico, San Angel (Schaffner), near 
Tacubaya (Bourgeau, 261), Mitla, Oaxaca (Andrieux, 100); Guatemata, Quiche 
(Godman & Salvin).—Southward to Cuiui and in the Sanpwicu IsLanps. Hb. Kew. 
19. PTERIS. 
Pteris, Linn.; Hook. et Bak. Syn. Fil. p. 153, et ed. 2, p. 487, t. 3. fig. 31. 
There are about 100 species of this cosmopolitan genus; only one, however, occurs 
‘in the Arctic Regions, and the greatest concentration of species is in Tropical America. 
1. Pteris (Litobrochia) aculeata, Swartz; Hook. Sp. Fil. ii. p. 224; Hook. 
et Bak. Syn. Fil. p. 171; Bak. in Journ. Bot. 1884, p. 362. 
Pteris apicalis, Liebm.., et P. protea, Liebm. Mexicos Bregner, pp. 76 et 77; Fourn. in Bull. Soc. 
Bot. France, xix. p. 258. 
Litobrochia setifera, Fée, Gen. Fil. p. 138, et 9° Mém. Foug. 
Pteris orizabe, Mart. et Gal. Foug. Mex. p. 53, t. 13, non KI. ex Fourn. 
Litobrochia orizabe, Fée, et L. hemipteris, Fée ex Fourn. 
Pteris (Litobrochia) propinqua, Agardh; Hook. Sp. Fil. i. p. 228. 
