478 MR. C. B. CLARKE ON THE FERNS OF NORTHERN INDIA. 
India forms vary from 4 to 16 in. long; the Nilgherry var. 4. opacum has still larger 
pinne ; indeed the well-developed 4. normale is larger than ordinary 4. mononthemum.— 
Again, A. pavoninum, Brack. U. S. Explor. Ferns, t. 20, has been reduced to A. erectum, 
but perhaps is nearer 4. normale, var. opacum.—Granting that A. normale is a distinct 
species from 4. monanthemum, it may be fairly argued that 4. monanthemum is a North- 
Indian fern. 
*** Fronds flabellately cut into 1-8 linear pinne. 
8. A. SEPTENTRIONALE, Hoffm. Fl. Germ. Comp! Crypt. 12. Frond glabrous.—Schk. 
Krypt. Gew. t. 65; Engl. Bot. t. 1017; Hook. Sp. Fil. iii. 174, Brit. Ferns, t. 26; 
Mett. Farngatt. Aspl. 141; Fil..Hort. Lips. t. 13. fig. 21; Milde, Fil. Europ. 81; 
Hk. & Baker, Syn. Fil. 198. Acrostichum septentrionale, Linn. Sp. Pl. 1524. 
Kashmir ; alt. 9000-12000 feet, frequent. Gurwhal; alt. 8000 feet, Strachey & Winter- 
bottom.—Distrib. Arctic and Temperate Alpine Europe, Asia, and America. 
+ Pinne numerous, usually 4 in. or more, oblong or oblong-linear. 
«| Pinne not very unequal at the base on either side the midrib. 
9. A. LoNGIssIMuM, Blume, Enum. Pl. Jav. Fil. 178. Frond 2-8 feet; rhachis with 
ovate fimbriate scales, producing a bud and rooting near the apex ; pinne 2-44 in., 
glabrous.—Mett. Farngatt. Aspl. 147; Hook. Sp. Fil. iii. 149, t. 190; Bedd. Ferns 
Brit. Ind. 63; Hk. & Baker, Syn. Fil. 199. 4. flagelliferum, Wall. Cat. 219. 
Sylhet station, Wallich; abundant, C. B. Clarke.—Distrib. Malay Peninsula, from 
Moulmein southwards, and Islands ; Mauritius. 
Rhizome very shortly creeping ; stipe with narrow lanceolate subentire light brown 
scales near the base. Fronds (at Sylhet) usually 6-8 feet, climbing over the swamp- 
jungle, repeatedly proliferous, linear; scales of the rhachis ovate, of finely reticulated 
subfenestrate tissue, with pectinate margin. Pinne oblong-linear, +4 in. broad, rhom- 
boidal, not cuneate at the base, serrate, scarcely lobed or subpinnatifid; sori oblique, 
linear, in two rows, usually towards the centre of the pinnz, not extending to the 
margin. Distinct from all other North-Indian Aspleniums by its great size.— Wallich 
wrote Sylhet as the locality where he obtained this fern ; I believe him. Over his sheets 
of specimens so marked (both at Kew and Calcutta) some miscreant has written Singa- ` 
pore and scratched out Sylhet. The fern abounds all round Sylhet station with its 
teelas now. | 
10. A. LONGIFOLIUM, Don, Prodr. Fl Nep.7. Stipes crowded on a decumbent caudex; 
frond 6-12 in., long-lanceolate, often almost coriaceous, in texture glabrous; pinnz 
2-3 in., faleate, auricled on the upper margin at the base, sharply finely serrate, 
usually subentire or slightly lobed, the lowest pinnæ (in Edgeworth's fine specimens) 
deeply lobed sub-2-pinnate.—Hk. & Baker, Syn. Fil. 234. A lobulosum, Wall. Cat. ` 
210; Mett. Farngatt. Aspl. 163; Hook. Sp. Fil. iii. 252. Diplazium longifolium, 
Moore, Ind. Fil. ii. 141. D. lobulosum, Bedd. Ferns Brit. Ind. t. 247. | 
