100 POLYPODIUM, § DIPTERIS. 



minated and very strongly serrated, costee costules and vena- 

 tion also nearly as in the preceding species but the sori are 

 more numerous lax and irregular yet generally forming 

 transverse lines or series following the direction of the trans- 

 verse veins, the capsules never held together by particles 

 of gum-resin. — Br. in Wall. Cat. n. 286. Horsf. Fl. Jav. i. 

 t. 1. Drynaria, /. Sm., Brack. Fil. U. S. Expl. Exped.p. 46. 

 Polyp, conjugatum, Kljfs. " IVesen cler Farrnkr. p. 104, 106." 

 Kze.' Annal. Fteridogr. p. 16. /. 10. Metten. Polypod. p. 119. 

 Dipteris, Reinw. Fee, Gen. Fil. p. 274 {excl. syn. Hook, and 

 Grev.). Polypod. Dipteris, Bl. Fil. Jav. p. 174. t. 81. 



Hab. Malay and Pacific Islands: Penang, Wallich, Norris ; Java, Blume, Zol- 

 linger, De Vriese and Teijsmann, n. 31, Thos. Lobb ; Luzon, Cuming, n. 155; 

 Singapore, G. Thomson; Borneo, Thos. Lohb, Barber, Lowe, Wallace; Pacific 

 islands, Fiji, Brackenridge, Milne, Seemann, n. 734 (stipes stout, 5 feet long), 

 Harvey; Ovalau, Milne, Brackenridge (alt. 2000 feet); Aneiteum, Milne and 

 M^Gillivray, C. Moore. — There is great similarity in very many points between 

 this and the preceding species ; bnt the diff'erences above mentioned are very con- 

 stant, add to which P. Wallichii is quite peculiar (as far as we yet know) to the 

 continent of India, as P. Horsfieldii is to the Malayan and Pacific islands. Young 

 fronds of this bear a great resemblance to the foliage oi Jeff ersonia dip hylla oi N. 

 America. 



401. P. (Dipteris) Lobbianum, Hook.; caudex? (probably 

 creeping), stipites 1 foot and more long, fronds coriaceous 

 8-10-12 inches long flabelliform glabrous 3-4 times digi- 

 tately dichotomous dark-brownish green above pale and 

 tawny beneath, segments 4-8 inches long scarcely \ an inch 

 wide linear-sublanceolate finely acuminated costate entire, 

 venation manifest, the costules form a costal series of large 

 soriferous areoles, the rest of the veins unite constituting 

 lesser areoles and include free veinlets, sori 1-2 in each 

 primary areole (sometimes confluent) in a single series very 

 near the costa. — Hook, hi Kew Gard. Misc. \.p. .300. t. 11. 

 Metten. Polyp, p. 104. Dipteris, Moore. 



Hab. Malacca, Mount Ophir and Sarawak, Borneo, Thos. Lobb. — A very rare 

 and elegant species, and though so extremely different, yet naturally allied to P. 

 Wallichii and P. Horsfieldii. 



§ 13. DiCTYOPTERis. — A not very satisfactory section, especially as defined by 

 Presl, u'ho makes it to include the simple-fronded Polypod. attenuatum, Br. 

 (§ Phyraatodes, nobis), and a more natural group with subdecompound frond, 

 and with the habit of Sagenia or Euaspidiura among Aspidieae, but to which is 

 attributed as essential the having areoles destitute of free included veinlets, 

 which is by no means a constant character. — Gen. Dictyopteris, Pr. Tent. Pterid. 

 t. 8./. 7. Sp. 402-409. 



402. P. (Dictyopteris) Barberi, Hook.; caudex rather stout 



