hyphe of the fungus in disintegrating and converting into a 
gummy substance the tissues of the host—which usually retains 
pale amb 
grey on the surface. Ifa s cob ule at this stage of development is 
hardened in spirit, and afterwards examined in section, its 
substance will be seen to be permeated by venfiedten slender, 
nre septate hyphe, agreeing in all essentials with the hyphz 
fungus present in the tissues of the host. These are in 
ue an extension of the hyphe of the parasite into the external 
mass > gum for the purpose of producing secondary reproductive 
bodie 
^ hyphae ae Lun the base of the globule of gum, and 
continue to gro til within a very short ee e from its 
periphery, but never rere beyond the matr 
At the stage indicated, the grey tinge meas on the surface 
of the Fac, of gum is due to ey formation of larger, vent walled 
cells, a Figel dia d moniliform manner, and of a pale smoky-grey 
colit at the tips of wee buc of aes e ems nearest the 
outside of the gum matri 
s of cues gum continues to increase in size, and 
the included hyphe kee x pei with UM extension, always keeping 
ne At the sam i 
m 
moniliform strings increase in ‘number, size, and depth of colour, 
imparting to the mass of gum the black colour indicating what 
may be vormied the period ota maturity. 
If during the period of formation of the mass of gum, the 
Wine. has been continuously moist, the ee hyphe radiate 
in comparatively straight lines from base to cireumference of the 
mass. On the other hand, if, after a PAM of damp weather, the 
as 
accommodating themselves to the altered conditions, ana: when 
the mass again expands after being moistened, the coils of hyphæ 
do not unfold, the tips resuming growth in a straight line so 
long as conditions are favou for oing; consequently 
when during the format um-mass, spells rain and 
ry hot weather have alte this is indicated by the 
ot w nated, idicate } 
alternation of spiral and straight zones of hyphe in its interior. 
If, after hardening in spirit, a section of a black mass of gum is 
examined, the internal portion is seen to be crowded with delicate 
hyaline hyphe, all SRO towards the circumference, as already 
explained, and possessing no feature of special interest, but as we 
approach the detonar of the mass, these slender hyphæ become 
tinged with and gradually widen out into the ns of dark- 
coloured, d, thick-walled cells previously mentione 
These terminal ains of dark cells are very irregular in 
structure, sometimes consisting of piii of elliptic or sausage- 
Shaped cells, much constricted at the septa, frequently branched, 
and bearing at the tip of each branch, sometimes also intercalary, 
very large, Vie arie thick-walled "cells. Other strings consist 
f larg drate or irregularly angular cell& which at times 
coalesce to form soli d masses of tissue resembling micro-sclerotia. 
A2 
1242 
