572 MR. C. B. CLARKE ON THE FERNS OF NORTHERN INDIA.. 
that species above); but it is very difficult to separate from M. triphyllum; indeed Mr. 
Baker has sorted our M. triphyllum, var. Parishii, under M. cuspidatum, Blume. 
Var. longifrons, (sp. JWall. Cat.60. Pinnæ 12-15 in., glabrous, entire, with 15-20 pairs 
of uniting veinlets, suddenly narrowed into a subulate apex 1-2 in. long. 
Himalaya and Khasia, alt. 500-4000 feet, very common.—This is probably a good 
species, but I can fix on no good diagnostic character; none of the Javan material 
approaches it, nor does it run into P. wrophyllum, with which it is often confounded. 
It is marked M. reticulatum in the Kew bundles. 
3. M. DELTIGERUM, Wall. Cat. 59. Fronds 1-pinnate, glabrous; fertile frond longer 
than the barren, the pinnse little narrower than those of the barren, crenated; 
sori ultimately confluent, forming deltoid masses between the very distinct main 
veins beneath.—Acrostichum virens, var., Hk. & Baker, Syn. Fil. 420. A. costatum, 
var., Hook. Sp. Fil. v. 262; Bedd. Ferns Brit. Ind. t. 114. 
Himalaya, alt. 500-2000 feet, from Nepaul to Bhotan, common. Chardooar and 
Roopraee Chang Hills, in Assam, Simons. Chittagong Hills, C. B. Clarke. 
If the position of the sori and the nature of the venation be adjudged matters of 
no weight in ferns, this species may be got into the same genus with Aerostichum 
virens; it will then be very difficult to unite it specifically, as there are no intermediate 
forms, and the fertile pinnz are only slightly dimorphous. Col. Beddome's figure 
unfortunately does not show the main veins beneath the fertile pinna, which are very 
strong and a diagnostic mark. 
37. ANTROPHYUM, Kaulf. 
1. A.comrAcEUM, Wall. Cat. 43. Stipe 0 or short; frond linear lanceolate acuminate, 
3-12 by 4-1 in., plicate, owing to the sori being much sunk in the frond, their 
lines distinctly raised on the upper surface.—Hook. Sp. Fil. v. 169; Hk. & Baker, 
Syn. Fil. 398. A. plicatum, Fée, Ze Mém. Foug. 44, t. 5. fig. 1. Hemionitis 
coriacea, Don, Prodr. Fl. Nep. 18. : 
Nepaul, Wallich. Sikkim; alt. 2000-5000 feet, C. B. Clarke. Mishmee, Griffith. 
Khasia, Griffith, Simons, alt. 250 feet at Shaila, C. B. Clarke.—Distrib. Mergui. 
There are both trigonous and ovoid spore-cases in this species; perhaps in all. 
Beddome doubts (with reason), Ferns Brit. Ind. Suppl. p . 25, whether the species is mg 
tinet from A. reticulatum. 
2. A. PLANTAGINEUM, Kaulf.; Bory in Voy. de la Coq. Bot. Crypt. t. 28. fig. 1. Stipes — 
many of them long ; frond oblong, acute, not plicate ; sori immersed.—Fée, 3" Mém. — 
Foug. 45; Carr. in Fl. Viti. 371. 4. reticulatum, Bedd. Ferns South. Ind. t. 52. : 
Sikkim; Tehonpong, alt. 4000 feet, Dikeeling, alt. 5000 feet, C. B. Geng? Assam, 7 
Simons. Khasia, Griffith.—Distrib. Ceylon, Malaya, Polynesia. | Tr Tem 
This differs from A. reticulatum by the long stipes, from A. dalifolium by eng deeg 
