115 
of fresh lavender shoots, the character of the submersed hyphae 
is maintained although not in so exaggerated a form. 
ter a few days’ growth the superficial hyphae begin to 
abstrict conidia, which at first are hyaline and thin-walled, but 
later become thick-walled and dark brown in coleur. 
out, 14 to 17 days pyenidial formation oceurs. 
Under unusual conditions or with age the cells of the hyphae 
enlarge, become thick-walled and brown and very easily separate 
forming chlamydospores. 
The fungus grows best at a temperature of about 18-20° C, 
Pycnospores,—The pycnospores are hyaline, fusoid in shape, 
and frequently contain one or two vacuoles. (Pl. VI. Fig. 1.) 
Their average measurement is 4 x 2 w, but very often spores of 
4 » and occasionally of 6 » in length may be found. Their 
walls stain bluish with Schultze’s chlor-zinc-iodine solution and 
the contents appear to consist iargely of glycogen. 
_ The germ tube may be protruded from the side or from the end 
in which case the spore appears merely to elongate into a hypha. 
(Pl. VI. Fig. 1. Text Fig. 8a.). 
SNS 
EY PP He \ 
oe i 
: a 
3a. Pyenospore fifteen hours after germination. Spore more highly 
magnified at the left side. (Swift } obj. x I. eyepiece.) le 
3b. The same colony after three days’ growth. Note the main lines of 
hyphae, which perhaps correspond to the distributive hyphae when the 
fungus is growing on its host. Spores in a hanging drop of lavender 
extract in a Van Tieghem cell at room temperature. (Swift 3 obj. x 
I. eyepiece. 
The direction of the germ: tubes is quite indiscriminate and 
does not appear to be conditioned either by the incidence of 
light rays or the local proximity of nutrient matter. 
Tn distilled water very slender unbranched germ tubes were 
produced which never developed to a greater length than 39 p. 
+n tap water slender feebly branching germ tubes were protruded, 
Stowing to about 150 uw in length. In bouillon few spores ger- 
+ 
minated and the feeble germ tubes produced did not exceed 95 p 
