MR. C. B. CLARKE ON THE FERNS OF NORTHERN INDIA. 467 
overlapping, but in the fertile somewhat distant. Fertile ultimate segments of the 
lower pinnules 3 by 3 in., linear-oblong, falcate, often broader upwards, obtuse, serrated 
at the barren apex. So far from sinking this species in P. quadriaurita, I doubt 
whether it is not more allied to P. crenata, with which Mettenius has indeed con- 
founded it. 
10. P. suBINDIVIsA, C. B. Clarke. Small, with 3 pinnz; terminal pinne 6 in., with 
numerous segments ; lateral pinnze hardly longer than the segments of the terminal 
pinne or subobsolete.— P. quadriaurita, Hook. Sp. Fil. ii. 179, partly. (Pl. LVI. 
fig. 1.) 
Bhotan, Griffith. Sikkim, alt. 1000 feet, C. B. Clarke. 
This is the fern referred to by Sir W. J. Hooker, Sp. Fil. ii. 181, ll. 18, 14. Tt is not, 
however, allied to P. Grevilleana, or indeed to P. subquinata, as Sir W. J. H. supposed, 
but to P. aspericaulis, Wall., of which it may be an extreme form. The fern grows plenti- 
fully on wet rocks by the pony-path near the rivers Rungait and Teesta. The texture, 
shape of segments, sori, venation as in P. quadriaurita, Retz., form aspericaulis, Wall. 
11. P. LONGIPINNULA, Wall. Cat. 108. Pinnæ 5 pairs, large, subremote, the lowest 
undivided, deeply pinnatifid, segments attaining 12 by 1 in., faleate, not distant, 
their apex usually barren, not acuminate, slightly crenate or subentire ; sori con- 
tinued nearly to the apex of the segments ; ultimate veins parallel, 1 millim. apart.— 
Hook. Sp. Fil. ii. 179, t. 134 4; Bedd. Ferns South. Ind. t. 43; Hk. & Baker, Syn. 
Fil. 158. 
Sikkim, Khasia, Cachar, Sylhet, alt. 0-3000 feet.—Distrib. Travancore, Malay Penin- 
sula and Islands. ' 
The area of this fern is as doubtful as its delimitation from P. quadriaurita, yar. 
major. The above description is from Wallich’s original example, which recedes less 
from P. quadriaurita than do some others. A specimen from Cachar, by R. L. Keenan, 
has the ultimate segments (of the lateral pinns) 21 by 3 in. with very parallel close 
veins.—The Sikkim examples referred here (collected by Sir J. D. Hooker and W. S. At- 
kinson) have the segments somewhat distant, the lowest pinne bipartite, and are doubly 
doubtful. 
12. P. EXCELSA, Gaud. in Freycinet, Voy. 388. Large; pinne several, the atio c 
times bipartite, pinnatifid nearly to the rhachis ; segments 2-34 by 3-5 in., elongate, 
narrowed upwards, faleate, often distant, their apex pr gs niii ; ae 
t - —Hook. Sp. Fil. ii. 183, t. 136; i . Ind. 
Ettel iad MO x Wall. Cat. 101; Agardh, Recens. 
t. 218 ; Hk. & Baker, Syn. Fil. 159. P. terminalis, 
Gen. Pter. 20. : 
- Kumaon, Gurwhal, Dalhousie ; alt. 4000-8000 feet, frequent. Sikkim ; alt. 8000-9000 
feet, Sir J. D. Hooker.—Distrib. Sandwich Islands. 
This is separated with comparative ease by the large tapering falcate segments 
