107 
in size they raise the cuticle of the leaf into a series of minute 
warts, until finally the tension is too great, and the cuticle 
ruptures, usually in a triangular slit through which the mature 
conidia protrude and soon become free on the surface of the leaf, 
n 
host-plant, germinate at once, enter the Bac of yon leaf, and 
orm a new centre of disease, which in course of time produces 
bution, it can be readily understood how possible and certain it is 
for ae disease to spread rapidly when once introduced into a tea 
gar 
ise Goia are oe at the apex of slender hyphae or 
conidiophores, and are very beautiful objects when seen under 
the microscope, be ung. narrowly elliptic with somewhat pointed 
ends, and usually three-septate ; the two end cells are colourless, 
while the two median cells are olive-brown, the terminal colour- 
less cell being surmounted by four very slender, colourless, 
spine-like processes eiie than the conidium itself. The abo ve- 
to four ; the hair-like vi Cengage also vary from one to four, or 
are sometimes entirely absen 
rn B M of the bigi was ascertained from a series of 
cu ; living conidia being obtained from the fungus growing 
on P amelitüs vuiüvatod i t Kew 
Conidia germinated "m within je ge om in hanging- 
drop cultures in ordina y tap water. The median dark-coloured 
cells of the conidia are Mone capable of peg on, each cell as 
a rule producing a single germ-tube ; in rare instances two germ- 
tubes spring from a cell, one of which remains rudimentary. On 
sterilised bread a dense white superficial mycelium dodi appears, 
on the surface of which very minute dark points, consisting of 
groups of conidia are visible about the third day. e days 
after sowing, the conidia are mature and eu le of germination, 
ad does not appear to be a very sui dium for th 
cultivation of this fungus, the characteristic breite mg filiform 
appendages of the conidia being almost co ntly below the 
number normally present, and in certain uu waGroly absent. 
The spineless condition of conidium agrees exactly with the 
Fra. i desorilied by Cooke as — Bobo, parasitie on 
living tea leaves from Cachar, which is in reality nothing more 
than an abnormal form of Pinas Guepini, and has also bee 
observed on Camellia leavesat Kew. Examples of these abnormal 
spineless conidia, sown on plum-juice gelatine, gave origin to 
perfectly normal Piso within a week, in fact only normal 
conidia were produced on the las-mebtonéd nutrient solution, 
whether normal or icorptiond qug cha ar s u number 
of apical spines were concerne It is qui easy 
matter to inoculate living unin idit porem cea bs placing 
heer on the damp under surface of the leaf, and keeping it 
ist for two or three days. No result was obtained when the 
ents were placed on the upper surface of the leaf. 
4 42 
