442 MR. C. B. CLARKE ON THE FERNS OF NORTHERN INDIA. 
Often scandent on trees or under damp rocks. In the Khasi common form the pinnse 
are often undivided with the margin nearly entire. This state is represented by 
Bélanger’s plate; but the fern varies, becoming more dissected till it approaches 
T. radicans. None of the Indian examples are however so much cut as the Javan; and 
the North-Indian material may be satisfactorily sorted out as between T. radicans and 
T. auriculatum. There is no real difference in the venation between the two; in the 
divided pinna of T. auriculatum the alternate segments are oblong 1-nerved. 
7. T. JAvANICUM, Blume, Enum. Pl. Jav. Fil. 224. Frond simply pinnate; pinne oblong 
serrate or linear fimbriate.— Hk. & Grev. Ic. Fil. t. 240; Hook. Sp. Fil i 130; 
Hook. Garden Ferns, t. 37; Bedd. Ferns Brit. Ind. t. 180; Hk. & Baker, Syn. Fil. 
83; Luerssen, Fil Graeff. 242; Benth. Fl. Austral. vii. 702. T. rigidum, Wall. 
Cat. 161, not Swartz. T. setigerum, Wall. Cat. 158. Cephalomanes javanicum, 
Zollingeri, rhomboideum, v. d. Bosch, Hymen. Jav. tt. 22, 23, 24. 
Cachar, R. L. Keenan. Chittagong; alt. 0-1000 feet, plentiful.— Distrib. Malay 
Peninsula and Islands to Australia and Polynesia, Madagascar. 
12. DAVALLIA, Smith. 
Sect. I. Humata. Rhizome long-creeping ; stipes solitary, distant, articulated upon the F 
rhizome; involucre thick, coriaceous, semicircular, attached by the base only. : 
1. D. PEDATA, Smith, Tentam. Gen. Fil. 15; Blume, Enum. Pl. Jay. Fil. 280; Wall. Cat. 
250; Hook. Sp. Fil. i. 154, t. 45 a; Hook. Garden Ferns, t. 7; Hk. & Baker, Syn. 
Fil. 89; Benth, Fl. Austral. vii. 716. D. subimbricata, Blume, Enum. Pl. Jav. Fil. 
231. Adiantum repens, Linn. f. Suppl. 446. Humata pedata, J. Smith; Bedd. 
Ferns South. Ind. t. 12. 
Sikkim, Dr. Jerdon.. Bhotan, Griffith. Khasia and Jaintea; alt. 4000 feet, generally 
scattered, not common.—Distrib. Malayan Peninsula and Islands, Ceylon, extending to 
North Australia, South China, and Japan, and to the Mascarene Islands. 
Easily separable from all other North-Indian Ferns, but closely allied to several ` 
Malayan. Not distinct from D. alpina, Blume, in the judgment of Col. Beddome. 
Sect. II. Leucostegia. Rhizome long-creeping ; stipes solitary, distant, articulated upon ` ` 
the rhizome (except in D. nodosa); involucre thin, membranous, semicircular OP ` ` 
ovate, attached by the base only. | 2 
2. D. MEMBRANULOSA, Wall. Cat. 255. Scales of the rhizome subulate from a narro w : x 
. lanceolate base; main rhachis beneath laxly hairy.—Hook. Sp. Fil. i. 159, t. 5834; —— 
Hk. & Baker, Syn. Fil. 91. Leucostegia membranulosa, Bedd. Ferns Brit. Ind. 
t. 98. d 
SE Wallich. Kumaon; Moharguri Pass, alt. 6500 feet, Strachey §& Winterbottom. ` 
_ There are only TON three pieces of this fern in the Kew Herbarium. It is very near 5 
D. excu but differs in kthe points stated. The whole frond i is more or lese, d ry 
