580 MR. C. B. CLARKE ON THE FERNS OF NORTHERN INDIA. 
without included veins along their midribs ; primary lateral veins distinct, parallel ; 
intermediate secondary venation irregular, with few free veinlets; fertile pinn: 3 
by 2 in.—Hk. & Grev. Ic. Fil. t. 22; Blume, Fl. Jav. Fil. 37, t. 13; Hook. Sp. Fil. 
v. 259; Hk. & Baker, Syn. Fil 418. A. diversifoliwm, Blume, Fl. Jav. Fil. 36, 
t. 12. Pecilopteris flagellifera, Bedd. Ferns Brit. Ind. t. 112. .Heteroneuron hete- 
roclitum and diversifolium, Fée, 2" Mém. Foug..91, 92. 
Round Bengal at the base of the hills, alt. 0-3000 feet; from Sikkim to Assam, Cachar, 
and Chittagong: common (at least the sterile fronds).—Distrib. Burma, Malaya, 
Philippines. 
This fern appears in two states, viz.:—(1) The Indian walking-leaf: the rhizome is 
here short terrestrial, the fronds commonly with 3 (sometimes with D or 1) pinnz; the 
terminal pinna prolonged often a foot or more, rooting near the vertex. I have never 
seen it fruiting in this state, nor have any of the flagelliferous fronds in the Herbarium 
any fruiting fronds attached, though there are fruiting fronds mounted with them. 
(2) Scandent several feet up trees; rhizome strong, densely scaly, with brown lanceolate 
scales at its extremities; the rhizome throws out radicles completely encircling boughs 
like tendrils; the fronds here have usually 7-9 pinne. Fruiting fronds are in this state 
rare; there are no fronds in young fruit in the herbarium; it would seem that the fruit 
arises in patches between the parallel main veins, and that the plant is allied to Menis- 
cium deltigerum, Wall.—This plant is separable by the fertile fronds with the venation 
from every form of A. virens and A. costatum, but not by the number of its pinne. I 
cannot see how A. repandum, Blume (Hk. & Baker, = Fil. 419), differs; it- does not 
differ in number of pinne. 
10. A. cRISPATULUM, Wall. Cat. 24. Barren pinne numerous, often 20 or more, 4 by A 
in., slightly serrate, the midrib often reddish when dry, a series of costal arches 
without included veins along their midribs, no free veins in any of the areolw; fertile 
pinne 4 by 1-1 in.— A. virens, var., Hook. Sp. Fil. v. 261; Hk. & Baker, Syn. Fil. ` 
420. (Pl. LXXXIV. fig. 2, b, d.) 
Round Bengal from Kumaon to Bhotan and Chittagong in the lower hills, alt. 0-3000 — 
feet, common. 
The only very common Bengal species of the group called 4. virens by Mr. Baker. 
Very constant in character, and easily recognized by the absence of free veins. 
Var. contaminans, Wall. Cat. 22. ies pinne often 3-1 in. broad, more Sa T 
green or yellowish ; fertile pinnee 3-4 in. broad. (Pl. LXXXIV. in 2, a, ai S 
Grows with the preceding ; a trifling variety. 
Var. Blumeana. Areolæ less elongate, irregularly hexagonal. E 
~ Cachar, R. L. Keenan.—"This is A. Blumeanum, Hk. & Baker, Syn. Fil. 423, as to the Kä 
North-Indian material placed in the bundle by Mr. Baker: I say nothing as to some of ` 
the Rope examples. i 
