MR. C. B. CLARKE ON THE FERNS OF NORTHERN INDIA. 529 
Ferns Brit. Ind. t. 228, it has the involueres of A. aristatum, and is A. aristatum, as 
Beddome has discovered, Ferns Brit. Ind. Suppl. p. 16. ] 
Subgenus IL. Hunephrodium. Lower pair of veinlets (and often some others) uniting 
into a veinlet carried to the sinus, not otherwise branching. Veinlets all carried to 
the margin. Sori all across the veinlets, none terminal. Fronds large, pinnate (in 
the Indian species). 
* Rhizome wide-creeping. 
t Lower pinne not tapering to the stipe, nor reduced to auricles, 
31. N. unrrum, R. Br. Prodr. Fl. Nov. Holl. 148. Base of the stipe black, glabrous; 
pinns cut down 3-3 the way to the midrib ; lobes ovate, acute, subentire; lowest 
pair of veinlets uniting often some distance below the sinus, next pair of veinlets 
much curving upwards, rarely distinctly uniting with the compound vein.—Hk. 
& Baker, Syn. Fil. 289. N. propinquum, R. Br. l. c.; Hook. Sp. Fil. iv. 79; Bedd. 
Ferns South. Ind. t. 89. Aspidiwm unitum, Swartz; Wall. Cat. 358 partly ; Benth. 
Fl. Austral. vii. 755. Polypodium secundum, Wall. Cat. 301. P. wnitum, Linn. 
Sp. Pl. 1548, at least in part.—Burm. Thes. Zeyl. 98, t. 44. fig. 1 
Bengal Plain, abundant in tanks; found in the hills in places' permanently wet.— 
Distrib. South India, Malaya, Tropical Asia, Africa, Australia, America. 
I have never seen this fern except floating in a tank or in a permanently wet 
ditch: the American examples appear also to grow in water. The involucres are 
nephrodioid, as also in the Australian specimens.—As to the name, Baker concludes 
by stating that the P. unitum of the Linnean Herbarium is JY. cucullatum, Baker, 
which might be inferred to necessitate changing all the names again; but Linnæus 
quotes Burmann's picture, which represents our JV. unitum ; and R. Brown meant that. 
As to Schk. Krypt. Gew. tt. 33, b, c, some or all of which are quoted as JV. unitum, 
R. Br. they may be so, but no one of those pictures represents the venation typical 
of the plant in India. . 
LAN pteroides, J. Sm.; Hk. & Baker, Syn. Fil. 289, is said to grow in the Himalaya. 
The only authority for this at Kew is a single sheet, on which there is a mixture of 
specimens from Blume and Wallich; with a note that the Wallachian examples were 
. portions of Wall. Cat. 386, from Kumaon. But Wallich states that his JV. terminans, 
Wall. Cat. 386, came from the Mts. of Ava. Nobody else finds W. terminans in the 
Himalaya. Mettenius considers it a mere apicifloral variety of W. extensum.] 
32. N. zxrENsuM, Hook. Sp. Fil. iv. 72, t. 240 A. Stipe and main rhachis beneath nearly 
glabrous; pinnze cut down $-3 the way to the midrib ; lowest pair of veinlets alone 
uniting ; lobes subacute, glabrous beneath, except minute glistening hairs on the 
veinlets; sori medium-sized, mostly in the lobes.—Bedd. Ferns South. Ind. t. 85; 
Hk. & Baker, Syn. Fil. 289. Aspidiwn extensum, Blume, Enum. Pl. Jav. Fil. 156. 
A. conioneuron, Mett. Farngatt. Pheg. & Asp. 102. A. prionophyllum, Wall. Cat. 
pe 355, not A. multijugum, Wall. Cat. 348. 
| Khasia, Griffith, 2 sheets, ee. Burma, Malaya, South India, ee , 
C 
