.MR. C. B. CLARKE ON THE FERNS OF NORTHERN INDIA. 411 
P. pedata, by Baker to P. palmata, consists of a fertile frond without the lower part of 
the stipe. It might be P. ludens; but the cutting is that of P. palmata, Hook. Garden 
Ferns, t. 22, or P. pedata, Hook. Fil. Exot. t. 34. There is in Wight's Peninsula Ind. 
Or. Herbarium a complete example, marked Doryopteris sagittifolia, which has the 
fronds closely tufted, and resembling in form Pteris sagittifolia, Raddi, Hook. Fil. Exot. 
t. 39; but the stipe is plentifully covered with long bright chestnut hairs, which extend 
to the ribs of the frond, and even over its surface beneath. In this scarcity of material 
from the Deccan the P. pedata of South India must remain obscure: P. ludens; of 
Chittagong, Burma, and Ava is completely known. 
Sect. V. Litobrochia. Veins copiously anastomosing, with some free included 
veinlets. Fronds 2-pinnate or still further divided. 
18. P. Gerten, Thunb. Prodr. Fl. Capens. 171; Blume, Enum. Pl. Jav. Fil. 212; Hook. 
Sp. Fil. ii. 280; Hk. & Baker, Syn. Fil. 172; Benth. Fl. Austral. vii. 732. P. ves- 
pertilionis, Labill. Nov. Holl. t. 245. P. aurita, Blume, Enum. Pl. Jav. Fil. 213; 
Mett. Fil. Hort. Bot. Lips. t. 14; Hook. Sp. Fil. ii. 281. P. sinuata, Wall. Cat. 
84; Brack. Fil of U.S. Explor. Voy. t. 14; Hook. Sp. Fil. ii. 282. — Litobrochia 
aurita, Bedd. Ferns South. Ind. t. 221. 
Sikkim, Bhotan, and Khasia; alt. 3000-6500 feet, frequent.—Distrib. Ceylon, Malaya; 
wide scattered in the tropics and southern subtropics of Asia, Australia, Polynesia, 
America, Africa. 
(P. marginata, Bory, Hk. & Baker, Syn. Fil. 172, has attributed to it Syllet as a 
locality, on the authority of Wallich, both by Hooker and Baker. There is no North- 
Indian specimen ; and I believe the fern has not been collected north of Malacea and 
Ceylon. Wallich mixed his collections from remote localities under the same number, 
frequently before distribution; and he has in so many known instances thus mixed 
different species, that I am not at all disposed to accept the locality of Sylhet on his sole 
authority. He not improbably confused the species P. marginata and P. Wallichiana 
altogether. Wallich’s example, supposed to be from Sylhet, is perhaps that on which 
Agardh founded his P. revolvens (Recens. Gen. Pter. 74).] 
21. CERATOPTERIS, Brongn. 
1. C. THALICTROIDES, Brongn. ; Hk. & Bauer, Gen. Fil. t. 12; Hook. Sp. Fil. ii. 235 ; Wall. 
Cat. 83; Blume, Enum. Pl. Jav. Fil. 240; Bedd. Ferns South. Ind. t. 75; Hk. & 
Baker, Syn. Fil. 174; Benth. Fl. Austral. vii. 695. Parkeria pteridioides, Hook. 
Exot. Flora, tt. 147, 231; Hk. & Grev. Ie. Fil. t. 97; Hk. & Bauer, Gen. Fil. t. 50. 
Pteris succulenta, Roxb. in Cale. Journ. Nat. Hist. iv. 508. Acrostichum thalic- 
troides, Linn. Sp. Pl. 1527. . 
From the Punjab to Bhotan and Chittagong; alt. 0-3000 feet, common.—Distrib. 
Deccan and Ceylon; Malay Peninsula; in the tropics of the whole world. 
In rice-swamps, floating ; but much more commonly erect, tufted, in ditches, or even 
SECOND SERIES.—BOTANY, VOL. I. 9T 
