STRUCTURE OF BAMBOO LEAVES. 83 
very conspicuous; linear silica-cells numerous. (3) Cult. Kew: Few bulliform cells with 
silica. 
Bambusa affinis, Munro. Yunzalia. One-half to all bulliform cells filled with silica ; short silica- 
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cells prominent. 
B. burmanica, Gamble. Katha. One-half to all bulliform cells filled with silica: short silica-cells 
very conspicuous, 
. B. pallida, Munro. Silhet. Nearly all bulliform cells filled with silica; short silica-cells very 
conspicuous. 
Ozytenant hera albo-ciliata, Munro. Burma, from different localities. One-half to all bulliform cells 
filled with silica. 
Dendrocalamus latiflorus, Munro. Formosa. One-fourth to one-half of bulliform cells filled with 
silica. 
. Cephalostachyum capitatum, Munro. Nearly all bulliform cells filled with silica ; linear epidermis 
silica-cells numerous. 
8. C. pallidum, Munro. One-half to all bulliform cells filled with silica. 
C. latifolium, Munro. Nearly all bulliform cells filled with silica. 
10. Melocanna bambusoides, Trinius. (1) From different localities: One-fourth to one-half of bulliform 
cells filled with silica; linear silica-cells numerous. (2) Cult. in Kew Palm-house: The same, 
but without linear silica-cells. 
11. Ochlandra Rheedii, Benth. One-half to all bulliform cells filled with silica. 
12. O. Beddomei, Gamble. One-fourth to one-half bulliform cells filled with silica. 
13. An undescribed species of Atractocarpa, Franchet, from tropical Africa. One-fourth to one-half of 
the bulliform cells filled with silica, 
14. Chusquea Quila, Kunth. Chili. One-fourth to one-half of the bulliform cells filled with silica ; 
linear silica-cells numerous. 
15. Nastus borbonicus, Gmelin. Bourbon. Half the bulliform cells filled with silica. 
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The data here brought together give no indication regarding the effect of climate and 
other conditions upon the accumulation of solid silica in the epidermis-cells of mature 
leaves. "The study of one species, however, not included in the above list ( Dendrocalamus 
strictus, Nees), has given me some facts which may be found suggestive. "This species 
grows both in the most tropical climate of Burma and the west side of the Peninsula, as 
well as in the dry region of North-west India, on the Aravalli Hills, the Salt Range, 
and the Sub-Himalayan tract, nearly to the Indus. Specimens collected in the Punjab, 
with a rainfall of 30 in., show an abundance of silica-bodies in the bulliform cells as 
well as in the short epidermis-cells. Specimens collected in Pegu, under a rainfall of 
60-80 in. have, in the bulliform cells, few silica-bodies in short lines, while linear 
epidermis-cells filled with silica are numerous. Leaves grown at Dehra Dun, with an 
| intermediate climate (rainfall about 50 in.), have the silica-bodies of the bulliform cells 
in interrupted lines, while linear epidermis-cells filled with silica are numerous. At the 
same time I may mention that on a transverse section the apparent mob are much 
longer in the leaves grown in Pegu than in those grown in the Punjab. Apit fen 
the difference in rainfall and atmospherie moisture, there is also a great difference in 
temperature. December, January, and February are cold months iu the Punjab, not ; 
uncommomly with severe frost, while Pegu has no winter. TR T 
