482 MR. C. B. CLARKE ON THE FERNS OF NORTHERN INDIA. 
sori.—Hook. Sp. Fil. iii. 164, t. 200 4; Bedd. Ferns South. Ind. t.145; Hk. & Baker, 
Syn. Fil. 211. A. planicaule, Wall. Cat. 189; Mett. Farngatt. Aspl. 157; Hook. 
Sp. Fil. iii. 163, t. 200 B; Bedd. Ferns South. Ind. t. 139; Hk. & Baker, Syn. Fil. 
211. A. cespitoswm, Wall. Cat. 217. 4. depauperatum, Wall. Cat. 234. 
Himalaya, alt. 3000-8000 feet ; from Gurwhal to Bhotan, common. Khasia, alt. 2000- 
5000 feet; very common.—Distrib. Mts. of Malabaria from Bombay to Ceylon; Japan. 
Rootstock tufted. Fronds 4-20 in. Pinnei-1i in. The type of A. laciniatum is here 
supposed to be that given in Hook. Sp. Fil. iii. t. 200 a, which represents the abundant 
Khasi form; the segments of the pinna are here obovate or subauricular, the margin 
obtusely toothed or subcrenate. 
According to Hk. & Baker, Syn. Fil. 211, the pinnz are more deeply pinnatifid, the 
sori shorter than in A. planicaule, which they, no doubt, usually are. 
Var. planicaule, (sp.) Hook. Sp. Fil. iii. 163, t. 200 B. Margin of the pinnæ with close 
acute, sometimes sublinear, teeth. The pinnæ are sometimes (as figured by Hooker) 
less pinnatifid than in 4. laciniatum type, but not rarely sub-2-pinnate. 
Var. depauperata. Fronds small; pinne pinnatifid less than halfway to the midrib, 
margin obtusely toothed or subcrenate.—Principally from Kumaon.—The existence 
of this variety destroys the value of the slight specific differences relied on by Hk. & 
Baker for distinguishing A. planicaule from A. laciniatum. 
17. A. PUMILUM, Sw. Fl. Ind. Occ. iii. 1610. Rhachis glabrous or sparingly pubescent ; 
pinne not numerous, upper pinne decurrent, lowest pinne pinnatifid nearly to the 
midrib.—Mett. Farngatt. Aspl. 127; Hook. Sp. Fil. iii. 174; Hk. & Baker, Syn. Fil. 
212. A. anthriscifolium, Jacq. Coll. ii. 103, t. 2. figs. 3, 4. 
Mexico, Central America, West-India Islands. 
Tufted. Stipe 3-6 in. Frond 4-8 in., usually glabrous. Pinne often 2-3 in., ovate- 
lanceolate, acute, venation not prominent.—Not found hitherto in the Old World. 
Var. hymenophylloides, Fée, 7th Mem. 54, t. 15. fig. 1. Frond smaller, pubescent or 
ciliate on both surfaces; texture exceedingly thin, with prominent venation, resem- 
bling that of Hymenophyllum; pinnæ obtuse.—.4. tenerrimum, (sp.) Hochst. in 
Schimp. Pl. Abyss. no. 2064. 
Mt. Aboo, J. E. Stocks, Dalzell.—Distrib. Abyssinia, Zambesi-land.—The Indian 
examples agree closely with the Abyssinian, and differ considerably from the New- 
World typical 4. pumilum. 
***** Fronds 2—-4-pinnate. 
t Texture coriaceous ; ultimate segments cuneate, shining above ; venation flabellate. 
18. A. RUTA-MURARIA, Linn. Sp. Pl. 1541. Frond small, glabrous, 1-3-pinnate; pinnæ 
not numerous, }-} in. diam., obovate or rhomboidal, not pinnatifid; margin of the 
involucre fimbriate.—Engl. Bot. t. 150; Mett. Farngatt. Aspl. 143; Hook. Sp. Fil. 
iii. 176, Brit. Ferns, t. 28; Bedd. Ferns Brit. Ind. t. 61; Milde, Fil. Europ. 76; 
Hk. & Baker, Syn. Fil. 213. : inue 
