MR. C. B. CLARKE ON THE FERNS OF NORTHERN INDIA. | 437 
. Himalaya; from Kumaon to Bhotan, alt. 4000-9000 feet, very common.  Khasia; 
alt. 2000-5500 feet, common.—Distrib. Tenasserim, Mts. of South India and Ceylon. 
Frond lanceolate, oblong, ovate, or short-triangular.— H. ciliatum, Swartz, differs by 
the margin of the frond being ciliate. Wallich’s H. exsertum has some H. polyanthos 
mixed with it. 
2. H. potyantuos, Swartz, Syn. Fil. 149. Glabrous or very nearly so, frond not crisped, 
stipe without a wing, or with an exceedingly narrow wing.—Hk. & Grey. Ic. Fil. 
t. 128; Hook. Sp. Fil. i. 106; Bedd. Ferns South. Ind. t. 280, not t. 267; Hk. & 
Baker, Syn. Fil. 60. H. polyanthos B. minor (= H. microsorum, v. d. Bosch ex Bedd. 
SuppL), Bedd. Ferns Brit. Ind. t. 306. H. abietinum, Hk. & Grev. Ic. Fil. t. 127. 
H. Blumeanum, Spreng.; Blume, Enum. Pl. Jav. Fil. 220; v. d. Bosch, Hymen. 
Jav. 46, t.36; Bedd. Ferns South. Ind. t. 266. H. badiwm, Wall. Cat. 172, not of 
Hk. & Grev. H. microsorwm, v. d. Bosch, Hymen. Suppl. 71; Hk. & Baker, Syn. 
Fil. 59. H. protrusum, Hook. Sp. Fil. 104, t. 37 B. H. pycnocarpum, v. d. Bosch, 
Hymen. Jav. 48, t.37. H. integrum, v. d. Bosch, Hymen. Jav. 49, t. 38. H. sphe- 
rocarpum, himalaianum, osmundioides, v. d. Bosch, Hymen. Suppl. 83, 72, 80. 
Himalaya; from Kumaon to Bhotan, alt. 1000—12,000 feet, abundant. Khasia; alt. 
2000-6000 feet, very common.—Distrib. Mts. of Malabaria and Ceylon, Burma. In 
nearly the whole world in tropical and subtropical moist regions. 
Frond (in the Himalayan examples) varies from triangular to linear; involucres 
variable in size, often smaller than in v. d. Bosch's typical H. microsorum.—Only the 
species which v. d. Bosch has founded on North-Indian specimens are included in the 
above quotation of synonyms. None of these can be ranked even as à variety according 
to the scale adopted in the present paper. Not only may they all be collected in a short 
walk from Darjeeling, but a large number (I might say an indefinite number) of addi- 
tional species (such as they are) will be collected during the same walk. 
3. H. JAvANICUM, Spreng. Syst. iv. 132. Glabrous or very nearly so; frond more e less 
crisped, especially the wing of the main rhachis, which is carried down the stipe.— 
Blume, Enum. P]. Jav. Fil. 222; Hook. Sp. Fil. i. 106; Hk. & Baker, Syn. Fil. 60; 
v. d. Bosch, Hymen. Jay. 50, t. 40; Benth. Fl. Austral. vii. 705. H. serpens, Wall. 
at.173. H. fimbriatum, J. Smith ; Hook. Sp. Fil. 102. t. 360; v. d. Bosch, Hy- 
men. Jav. 55, t. 44. H. flexuosum, A. Cunningham ; Hook. Sp. Fil. i. 105; Hook. 
Ic. Pl. t. 962. H crispatum, Wall. Cat. 169; Hk. & Grev. Ic. Fil. t. 77 ; Hook. 
Sp. Fil. i. 105; Bedd. Ferns South. Ind. t. 207. H. micranthum, v. d. Bosch, Hy- 
men. Jav. 52, t. 41. H. erosum, Blume, Enum. PI. Jav. Fil. 221; Hook. Sp. Fil. i. 
108; v. d. Bosch, Hymen. Jav. 54, t. 43. H. dedaleum, Blume, Enum. Pl. Jav. Fil. 
222; Hook. Sp. Fil. i. 108. H Reinwardtii, v. d. Bosch, Hymen. Jav. 52, t. 42. 
Himalaya ; from Nepaul to Bhotan, alt. 5000-8000 feet, common. Khasia ; alt. 3500- 
. 5500 feet, common. Distrib. Mts. of Malabaria and Ceylon; Burma, Malay Peninsula, 
. Australia, New Zealand, Mauritius, and Bourbon. E 
