JOURNAL OF MICROSCOPICAL SCIENCE. 
EXPLANATION OF PLATES IX— XIV, 
Illustrating the paper on the Coffee-leaf Disease of 
Ceylon/’ by W. T. Thiselton Dyer, M.A., F.L.S. 
The whole of the drawings were made by D. Morris, M.A., F.G.S., for 
his forthcoming Handbook. 
EXPLANATION OF PLATE IX. 
Fig. 1. — Under side of coffee leaf, showing disease spots in various 
stages of development. The orange -coloured sporangia are arranged in 
numberless clusters on each spot. a. An old^disease spot subsequently 
attacked by a second fungus {^Aspergillus'), b. A disease spot traversed 
by nerves of the leaf. In such cases the filaments cross over the barriers 
formed by the nerves from one stoma to another, on the outside of the 
leaf. 
Fig. 2. — Disease spots coalescing and forming an individual patch. 
Fig. 3. — Portion of coffee leaf, twice natural size, with old disease 
spots in the centre. The immature sporangia are orange coloured, 
whilst the more mature are colourless. The larva of a male dipterous 
insect is represented feeding on the sporangia. See fig. 7. 
Fig. 4. — Disease spot, magnified about ten times, showing the arrange- 
ment of the sporangia in clusters. 
Fig. 5. — Portion of under surface of coffee leaf magnified, so as to 
show : — A. Stomata, b. Cluster of sporangia coming through and occu- 
pying the area of a stoma, x 200. 
Fig. 6. — Single cluster of sporangia; The more mature have fallen 
off, exposing their points of attachment. X 500. 
Fig. 7, — Enlarged drawing of larva of dipterous insect, found feeding 
on sporangia of Hemileia. Sec Fig. 3. 
EXPLANATION OF PLATE X. 
Fig. 1. — Sporangia found on fallen leaves and moist surfaces under 
coffee trees, giving rise to wide-spreading mycelial filaments. X 250. 
Fig. 2. — Sporangia sown on glass slide, and kept in a moist atmo- 
sphere for thirty-six hours. Mycelial filaments abundantly produced. 
A. Unbroken cluster of ripe sporangia, b. Detached orange-coloured 
sporangia, c. Sporidia escaped from the sporangia, developing fila- 
ments. c. Sporidia developing filaments whilst still enclosed in the 
sporangia, x 600. 
VOL. XX. NEW SEK. 
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