MR. C. B. CLARKE ON THE FERNS OF NORTHERN INDIA, 481 
14, A. UNILATERALE, Lamk. Encycl. ii. 305. Frond linear, glabrous, membranous ; pinnze 
numerous, oblong, somewhat falcate, the lower margin completely cut away near the 
base, toothed upwards.— A. resectum, Smith, Pl. Ic. hact. ined. t. 72; Hk. & Grey. 
Ic. Fil..t. 114; Mett. Farngatt. Aspl. 132; Hook. Sp. Fil. iii. 130; Carr. in FI. 
. Viti.354; Bedd. Ferns South. Ind. t.132, Ferns Brit. Ind. tt. 356, 357; Hk. & 
. Baker, Syn. Fil. 210. A. abscissum, porphyrocaulon, erythrocaulon, erosodentatum, 
Blume, Enum. Pl. Jav. Fil. 182, 183. A. trapeziforme; Wall. Cat. 66; Roxb. in 
Cale. Journ. Nat. Hist. iv. 497 ; Bedd.: Ferns South. Ind. t. 194. A. letum, Wall. 
Cat. 209, not of Swartz. A. decurrens, Wall. Cat. 190. A. cristatum, Wall. Cat, 
211. A. amenum, Presl; Mett. Farngatt. Aspl. 131. 4. serreforme, Mett. Farn- 
gatt. Aspl. 119, t. 4. fig. 13. A. emarginato-dentatum, Zenker; Mett. Farngatt. 
Aspl, 132. : 
Himalaya, alt. 1000-9000 feet; from Chumba to Bhotan ; common from Nepaul east. 
ward. Khasia, alt. 1000-5000 feet, common. Chittagong.— Distrib. Nilgherries and 
Ceylon, Malay Peninsula and Islands, Polynesia, Japan ; Tropical Africa. 
_ Rhizome slender, creeping. Pinnæ in the large forms (4. cristatum, Wall.) attaining 
3 in., in the small forms (decurrens, Wall.) 4-Lin. Sori often commencing from near 
the midrib.—YVar. udum, W. S. Atkinson, is a form pendent from dripping rocks, the 
pinne very oblique, closely fimbriate-pinnatifid on the margin. This variety is ex- 
ceedingly unlike 4. decurrens, Wall., which Beddome supposes it to be (see Ferns Brit. 
Ind. Suppl. p.10); but it is found in Africa and Malaya as well as in the Himalaya, 
and must rank as a mere variety of A. unilaterale. 
15. A. ngrEROCARPUM, Wall, Cat. 218. Frond linear, glabrous, membranous; pinno 
numerous, oblong, the lower margin cut away for the whole or nearly the whole 
length of the pinna.—Hook. Sp. Fil. iii. 132, t. 175; Bedd. Ferns South. Ind. t. 131; 
Hk. & Baker, Syn. Fil 210. A. cheilosorum, Kunze; Mett. Farngatt. Aspl. 133, 
t. 5. fig. 12, 13. | | 
. Himalaya, alt. 4000-8000 feet; from Nepaul to Bhotan, frequent. Khasia, alt. 3000- 
5000 feet, frequent.—Distrib. Malay Peninsula, South China ; Mts. of the South Deccan 
and Ceylon. | Ded ! 
Sori rarely commencing from near the midrib, often confined almost to the teeth of 
the closely fimbriate upper margin of the pinns.— This species is very near 4. uni- 
laterale, indeed so near that the Bourbon examples marked by Mr. Baker A. heterocarpum 
I refer to A. unilaterale. 
**** Fronds 2-pinnate or sub-2-pinnate (but varieties with subentire pinna occur). 
16. A. uacttarum, Don, Prodr. Fl. Nep. 8. Stipe with lanceolate or linear scales ; 
rhaehis upwards glabrous or very sparingly scaly ; frond Hnear, with numerous 
oblong-linear pinne; pinnæ very unequal at the base, pinnatifid halfway to the 
midrib, or nearly or quite 2-pinnate, secondary segments with irse ovs and 
