MR. C. B. CLARKE ON THE FERNS OF NORTHERN INDIA. 457 
7. Cu. RUFA, Don, Prodr. Fl. Nep. 16. Frond lanceolate; lowest pair of pinne usually 
smaller than the next superior pair; stipe and whole frond beneath woolly with 
crisped hairs; margin of involucre much fimbriate.—Hook. Sp. Fil. ii. 79, t. 994; 
Mett. Farngatt. Cheil. 47; Bedd. Ferns Brit. Ind. t. 144; Hk. & as Syn. Fil. 
141. Ch. tomentosa, Herb. Wall. 
` Khasia; alt. 4000 feet, plentiful wherever there is limestone. Sikkim; alt. 5000 feet, 
rare (as is limestone). Gurwhal, alt. 2000 feet, H. C. Levinge.—Distrib. Mergui. 
I have collected much of this fern, but only on limestone ; it is generally closely pro- 
cumbent, curling up on the rock, and easily recognized by its woolly hairiness. Scales 
often none, or undistinguishable from the hairs; scales, when present on the stipe mixed 
with the hairs, are narrow-linear uniform-coloured. Fronds above laxly flocculose or 
woolly, or almost tomentose.—Col. Beddome remarks (Ferns, Suppl. p. 7) that Wallich 
was right in calling this plant Ch. farinosa, var. vestita; but Wallich calls it Ch. tomen- 
tosa in his Herb., and some other hand (apparently) has directed it to be put * with 71," 
i.e. Ch. farinosa.. 
8. Cu. FARINOSA, Kaulf, Enum. Fil 212. Frond triangular-lanceolate or long-lanceo- 
late; lowest pair of pinnæ often distant, as much developed as any of the superior 
pinne ; stipe shorter than the frond, glabrous, with some lanceolate-linear uniform- 
coloured scales near the base; pinnse without hairs beneath, rarely with a few 
scales, always more or less powdered ; involucre usually toothed, sometimes lacerate. 
—Hk. & Grev. Ic. Fil. t. 134; Hook. Sp. Fil. ii. 77; Bot. Mag. t. 4765; Mett. 
Farngatt. Cheil. 46; Bedd. Ferns South. Ind. t. 191; Hk. & Baker, Syn. Fil. 142. 
Ch. dealbata, Don, Prodr. Fl. Nep. 16; Wall. Cat. 71, as to type sheet. Ch. rigi- 
dula, Wall, Cat. 2175. Ch. bullosa, Bedd. Ferns South. Ind. t. 199. Pteris farinosa, 
Forskh. Fl. ZEgypt. Arab. 187. Pt. bicolor, Roxb. in. Calc. Journ. Nat. Hist. iv. 507. 
Throughout Northern India, in the hills, alt. 0—5000 feet from Kashmir to Assam gnd 
Chittagong; also in Chota Nagpore.—Distrib. Whole Deccan and Ceylon; Eastern 
Africa with its islands and Arabia; Java and the Philippines; Tropical America. 
This species is easily separable from Ch. rufa and Ch. albomarginata above. I cannot 
separate it satisfactorily from Ch. argentea, var. chrysophylla. All the India examples 
are white- or pale-yellow-powdered below, except a very large dark-green form sent by 
Mr. Batcock from Ootacamund, marked var. concolor. | 
Var. Dalhousie (sp.), Hook. Sp. Fil. ii. 10. Pinnæ (even when young) without hairs, 
scales, or powder beneath; involucres deeply crenulate, toothed or lacerate on the 
margin.—Hk. & Baker, Syn. Fil. 137. (Pl. LI) 
Western Himalaya, from Kashmir to Kumaon, alt. 6000-9000 feet, frequent. Sikkim; 
Lachen, alt. 10,000 feet, Sir J.. D. Hooker.—Hook. Sp. Fil. ii. t. 78 B, is named Ch. de- 
albata, but quoted at page 80 for Ch. Dalhousie; but Mr. Baker has withdrawn it, as 
it is taken from a sheet of examples containing a mixture of forms.—Bedd. Ferns South. 
Ind. t. 193, does not show the rhizome and lower scales; nor is the cutting that of 
Ch. Dathousia ; all Col. Beddome’s examples of Ch. Dathousie EE from the 
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