428 MR. C. B. CLARKE ON THE FERNS OF NORTHERN INDIA, 
laysonianum, Wall., of Hooker & Baker, is not Asplenium Finlaysonianum, Wall., nor 
even of the same subgenus, the fact being that the Wallichian duplicate sheets of Asple- 
nium Finlaysonianum, Wall, at Kew, are not the same as the Wallichian type-sheet; 
and if errors from this cause are not rare at Kew, botanists at a greater distance from 
head quarters cannot be expected to avoid them. 
Of the 379 species of North-Indian Ferns, 88 (so far as yet known) are confined to it. 
In the Himalaya westward from Nepaul 149 species occur, while in the Himalaya east 
of Nepaul 269 species occur; the Eastern region of Khasia and Chittagong has afforded 
258, while 52 species occur in the plains. Out of 75 genera (as understood by Hooker 
and Baker) 50 are represented in North India. 
1. GLEICHENTA, Smith. 
1. G. evauca, Hook. Sp. Fil. i. 4, t. 3 B, not of Swartz; Mett. in Ann. Mus. Lugd. Bat. 
1.48. G. longissima, Blume, Enum. Pl. Jav. Fil. 250; Hook. Sp. Fil. i. 4; Mett. Lei 
Hk. & Baker, Syn. Fil 12; Luerssen, Fil. Graeff. 248. G. gigantea, Wall. Cat. 
157, as to the type-sheet ; Hk. & Bauer, Gen. Fil. t. 39; Hook. Sp. Fil. i. 5, t. 84 ; 
Bedd. Ferns Brit. Ind. t. 30. G. Bancroftit and excelsa, Hook. Sp. Fil. i. 5, t. 4 
A, B. G. arachnoides, Mett. l. c. 47. OG japonica, Spreng. Syst. iv. 25. Poly- 
podium glaucum, Thunb. Fl. Jap. 338. Mertensia glauca, Swartz, Syn. Fil. 164, 
390. M. glabra, Brack. U.S. Explor. Ferns, 1854. 
Sikkim and Bhotan; alt. 4500-7590 feet, in the dripping forest region, common. 
Khasia; alt. 8500-5000, common. Nepaul, Wallich.—Distrib. Extends eastwards through 
China, Japan, and Malaya, to Tropical Australia, Polynesia, and America. Not in the — 
Deccan. nor in Ceylon. EC 
Seandent over other jungle, sometimes covering a spur for several hundred feet. 
Fronds in pairs at the dichotomous branching of the main rhachis, often 6 feet long, 
pendent, curved. Texture of the pinnules hard, stout, margin recurved; veinlets ` ` 
2-branched from near their base. Frond (sometimes on both surfaces) with the capsules 
often glistening, puberulous, from scattered minute subglobose glands. Rhachis and 
pinnules beneath glaucous or densely ferrugino-tomentose (in the Indian examples). 
2. G. LINEARIS, C. B. Clarke. G. Hermanni, R. Br. Prodr. 161, and in Wall. Cat. 155; 
Blume, Enum. Pl. Jay. Fil. 248, not of Hk. & Grev. G. ferruginea, Blume, Enum. ` ` 
Fil. Jav. 249; Hook. Sp. Fil. i. 10. G. lanigera, Don, Prodr. Fl. Nepal. 17. Gd ` 
chotoma, Hook. Sp. Fil. i. 12; Bedd. Ferns South Ind. t. 74; Mett. in Ann. Mus. d 
Lugd. Bat. i. 50, t. 3; Carr. in Fl. Viti. 332; Hk. & Baker, Syn. Fil. 15 ; Benth. — 
Fl Austral. vii. 698; Luerssen, Fl. Graeff. 249. G. Klotzschii, Hk. Sp. Fil.i.19, ` 
t. 5, B. G. pteridifolia and crassifolia, Presl, Epimel. 23, t. 13, 14. Polypodium ` 
lineare, Burm. F1. Ind. 235, t. 67. fig. 2. D dichotomum, Thunb. Fl. Jap. 338, t. 37; 
Roxb. in Cale. Journ. Nat. Hist. iv. 493. Mertensia emarginata, Brack. U.S. Ex- ` 
plor. Ferns, 297, t. 42: M. dichotoma, Langsd. & Fisch. Voy. Russ. t. 29. MS 
Sikkim, Bhotan, and Khasia, alt. 0-5000 feet, common; extending Gene Nepal 3 
