KS. MR. C. B. CLARKE ON THE FERNS OF NORTHERN INDIA. 607 
EXPLANATION OF THE PLATES. 
PLATE X LIX. 
Fig. 1. Cyathea spinulosa, Wall., drawn from Wallich’s own example n. 178 of his Catalogue.—4A. Barren 
secondary pinna, nat. size. B. Fertile secondary pinna, nat. size. i 
Fig. 2. Hymenophyllum denticulatum, Swartz, drawn from a Khasi example.—B. Two entire fronds on 
one rhizome, nat. size, seen from above. A. One pinna, magn. 5 diam., seen from beneath. 
Fig. 3. Hymenophyllum Levingii, C. B. Clarke, drawn from a Yoksun example.—A. One frond, nat. 
size. B. Barren lobe of pinna, magn. 20 diam., seen from beneath. C. Fertile lobe of pinna, 
magn. 20 diam., seen from beneath. 
Fig. 4. Davallia pulchra, Don, var. pseudocystopteris, (sp. Kunze, from a North-west Himalayan 
example; extremity of an ultimate pinna, magn. 8 diam., showing the very thin indusia of 
large oblong cells. 
PLATE L. 
Davallia urophylla, Hook. (not Wall.), from Griffith’s Bhotan example; one lower pinna, nat. size. 
PLATE LI. 
Cheilanthes farinosa, Kaulf., var. Dalhousie, (sp.) Hook., from North-west Himalayan examples. 
A. an entire frond from a small specimen, and B, the lowest pinna of a frond from a larger 
` specimen, both nat. size. C. Scale from the stipe, magn. 8 diam. 
Prate LII. 
Cheilanthes albo-marginata, C. B. Clarke, from a Kashmir example.—A. A whole plant, nat. size. 
B. Scale from the stipe, magn. 8 diam. 
Prare LIII. 
Pteris quadriaurita, Retz., var. Khasiana, from a Walong example.—A. The lowest pinna of a frond, 
nat. size. (The entire lanceolate-linear irregular reduced secondary pinna at the base of the 
pinna in this example has been faithfully added by the artist; it was accidentally present. 
here, but in none of the other examples.) B. A basal secondary pinna, nat. size. 
Prare LIV. 
Pteris Grevilleana, Wall., from Keenan's Cachar example; one barren and one fertile frond on the same- 
rhizome, nat. size. 
Prats LV. 
Pteris quadriaurita, Retz., var. Blumeana, (sp.) Agardh, from a Chittagong example ; one basal (bipartite), 
pinna, nat. size. 
| Puate LVI. : 
Fig. 1. Pteris subindivisa, C. B. Clarke, from a Teesta (Sikkim) example; a rhizome with one frond and 
part of another, nat size. (The basal pinnz are sometimes much shorter than in this fully- 
developed specimen, or obsolete.) : : : 
Fig. 2. Asplenium pekinense, Hance, from Levinge's Kashmir example; rhizome with one frond, nat. 
_ SECOND SERIES.— BOTANY, VOL. I. AN 
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