322 Marshall Ward. — On a lily -disease. 
A vertical section through a badly diseased patch (Fig. 3), 
or through buds in the conditions shown in Figs, 1, 4, shows 
that the grey mouldiness is due to countless erect branched 
conidiophores, which burst through the cuticle of the epi- 
dermis from the tissues inside, and bear the conidia or spores 
(Figs. 5, 9). The conidiophores stand off from the surface 
into the damp air, and usually attain a height of about 
one to three millimeters : as will be shown later, they may 
attain much larger dimensions under certain conditions 
fulfilled in cultures. Each conidiophore bores its way through 
the walls and cuticle of the epidermis-cells (Figs. 7, 10), 
grows erect for some time, and then puts forth from two 
to five or more stout, short branches : meanwhile the main 
stalk has become septate, and its walls pale sepia-brown in 
colour. The conidia begin to arise as little peg-like projec- 
tions from the swollen ends of the branches (Fig. 9 c .), the 
ends of the pegs becoming enlarged and filled out more and 
more with protoplasm. 
In such sections as Fig. 5, taken from buds already 
thoroughly destroyed by the fungus, the hyphae from which 
the conidiophores spring are found to occupy every part of 
the bud : not only are all the lacunae and cell-cavities of the 
calyx and corolla completely full of mycelium, but the tissues 
of the anthers and ovary likewise. Between the pollen-grains, 
between the ovules, and even in the tissues of the latter, are 
the finer hyphae of the fungus, branching in all directions. 
Moreover, no traces of distinct cells are to be found, for the 
hyphae completely occupy the substance of the cell-walls, as 
well as the cavities, and reduce the whole tissue to an 
amorphous mass of swollen, brown organic substance, in and 
through which the mycelium is running ; so that, as seen in 
Fig. 5, the remnant of what was the tissues of the bud now 
forms a mere discoloured packing, so to speak, between the 
interwoven hyphae. 
Sections through a bud in the state shown in Fig. 3 present 
a less advanced stage of destruction : the epidermis and 
subjacent tissues beneath the buff-coloured area are utterly 
