CHARACTERS Or TRIBES AND GENERA. 87 



Obs.— la my "Genera of Ferns," 1841, I noticed the 

 peculiarity of the species in the preceding genus, and also of 

 this, but then did not deem the characters sufhcient ti> 

 separate it as a genus from Pohjpodium. Later observa- 

 tions, and the views of both Presl and Fee, induce mo now 

 to separate them from true Polypodiums. 



Sp.— C. obliquatus (£/.), (nedd. F. Brit. Iiid. pi. 167), 

 C. celebicus (Bl.), C. venulosum (Bl.), 0. blechnoides 

 (/. Sin.), {Grammitis blechnoides, Grev. 1848*, Gryptosorux 

 Seemannii, J. Sm., Bonplandia, vol. 9), C. Khasyanus 

 (Hooh.). 



Natives of Java, Celebes, Luzon, Fiji, Ceylon and India. 



7. — Thylacopteris, Eze. Herh. (1850). 

 Polypodium, sp. Bhnne. Hoolc, Sp. Fil. 



Sttrculuin slender. Fronds distant, stipate, linear, jiinna- 

 tifid, membraneous, smooth, 1 to 2 feet high, 2 inches 

 broad, lacinias articulate with the rachis. Veins once 

 forked, venules free, the exterior branch soriferous. 

 Feceptades jjunctiform, terminal, deeply immersed in a cyst, 

 forming elevated papilla; on the upper side. Sori trans- 

 verse, uniserial near the margin of the lacinia\ 



Type. Polypodium, papillosum, Blwine. 



Illust.— Bl. Fl. Jav., p. 191, t. 88. Horsf. PL Jav. Par., 

 p. 6, t. 2. 



Obs, — Finding that the Polypodium papillosum of IJlumc 

 does not well associate with any of the species of Polypo- 

 dium as here restricted, I therefore deem it best to follow 

 Kunze in adopting it as a distinct genus. The forked 

 venation distinguishes it from Prosaptia and Gryptosurus ; 

 and the deeply-impressed receptacles and the articulation 

 of the seg'ments with the rachis from true Polypodium. 



* Ann. Mag. K"at. Hist., 2nd .scr. vol. 1, p. 17. 



