o24 
mycelium in both sets of cultures was latterly of a dark-grey 
colour with a faint pink tinge in parts. 
Fic. 2.—Conidia from pure culture of Fusarium sp. from Nigella, x 500, 
Fic. 3.—Microconidia and a chlamydospore from same culture as 2, x 500. 
The tissue fragments of both Vigella and Delphinium in prune- 
agar gave rise overnight to aerial mycelium which was white, 
flocculent, septate, branched, finely-granular, and of an average 
thickness of 5 ». Growth continued vigorously, and after four 
days microconidia were very numerous. These were succeeded 
by macroconidia and chlamydospores after a further twenty-four 
ours. ‘ 
Fic. 4—Formation of terminal conidia in same culture as 2and 3, x 500- 
Fig. 5.—Conidia of Fusariwm sp. from Delphiniwm, x é 
The Cosmos material was rather scanty, and it was unfortu- 
nately impossible to isolate from it pure strains of the fungus at 
work. But it should be noted that a Fusarium was found exter- 
species of Fusarium 
Nigella and Delphinium plants, and 
) ground for the conclusion that the fungus 
was the same in all three cases. As it was desirable 
more closely than had been done the differences between 
