376 Marshall Ward . — On a lily-disease. 
EXPLANATION OF FIGURES IN PLATES XX, 
XXI, XXII, XXIII, and XXIV. 
Illustrating Professor Marshall Ward’s paper on a lily-disease. 
PLATE XX. 
Fig. i. The upper portion of a flowering raceme of Lilium candidum, with the 
buds and bracts attacked by the Botrytis ; the ashen-grey colour on the buds is due 
to tufts of the conidiophores of the fungus. Natural size, drawn July 7th. 
Fig. 2. A bud with one ‘disease-spot’ in an early stage of development; 
the depressed centre of the spot is orange-brown, the margin paler, and a zone 
of green surrounds the whole. Nat. size. 
Fig- 3 - The above spot in a later stage of development : the powdery appearance 
is due to the spores. Nat. size. 
Fig. 4. One of the above buds completely destroyed by the fungus ; the tissues 
are permeated in all directions by the close-set mycelium, and the whole is reduced 
to what practically resembles a sclerotium. Nat. size. 
Fig. 5. Portion of a thin section through a lily-bud in the condition of the lower 
ones of Fig. 1. The tissues of the bud are unrecognisable, as they are practically 
replaced by fungus-hyphae, forming a dense, tough felt-work of the nature of 
a stroma or sclerotium. Two tufts of conidiophores are seen, projecting from the 
surface. Zeiss B. 
Fig. 6. Portion of thin section across such a spot as that in Fig. 3, at the margin 
where the healthy and moribund tissues join. The dead and dying cells in and 
near the region attacked by the fungus, collapse and cause the whole to shrink. In 
the swollen cell- walls are the hyphae, cut across in all directions : these are 
already sending conidiophores to the exterior, and long hyphae down between the 
killed cells of the interior. Note the collapsed lumina and swollen walls of the 
latter. Zeiss B. 
Fig. 7. Portion of the last preparation more highly magnified, and showing more 
clearly the cut hyphae running in the substance of the cell-walls of the epidermis 
and other tissues. It also shows the base of young conidiophores, and the long, 
thin, almost vertical hyphae sent down between the cells of the interior. Zeiss D. 
Fig. 8. Portion of a transverse section through a sepal of the lily near a disease- 
spot, but at a place just beyond the region actually occupied by the hyphae : the 
cell-walls are becoming swollen, discoloured, and disorganised, and the contents of 
the cells destroyed. 
Fig. 9. Group of conidiophores in various stages of development, growing into 
the damp air from the surface of the bud. A hypha (a) is protruded, and then {b) 
becomes septate, and puts forth a few branches ; these branches swell at their ends 
(c), and develop minute peg-like protuberances at various points. Each of these 
pegs gives rise to a conidium, by swelling at its distal end into an oval body, which 
soon acquires the typical characters of a spore (<?). Zeiss D. 
Fig. 10. Young hypha emerging through the epidermis of the petal of a 
lily. The development is very rapid, as will be seen later. Zeis D/ 2 . 
Fig. 11. Conidia, and their germination. To the left are two recently detached 
