182 Transactions British Mycological Society. 
Pink tinge at the surface of the medium. Submerged mycelium 
slight and hyaline. Black acervuli large and scattered, with 
numerous smaller black bodies, apparently sterile acervuli, 
which were scattered throughout the medium. On other media 
the cultures only differed in the numbers of acervuli. 
Form E. Aerial mycelium very scanty, white; submerged 
mycelium hyaline, scanty; pycnidia and spore masses very 
numerous and both of a light brown or straw colour. Other 
cultures showed variations in the colour of the mycelium, but 
the pycnidia were always light brown in colour. 
Form F. Aerial mycelium fairly plentiful, white, tending to 
be floccose. Pycnidia very numerous, light brown, particularly 
aggregated at the bottom of the culture. Spore masses infre- 
quent, light yellowish brown in colour. In this case, the colour 
of the pycnidia varied greatly, as on tomato agar and sterilised 
tomato stem the pycnidia were almost black; this was not a 
matter of age of culture since, on Dox’s medium, the pycnidia 
were still light brown in colour at the end of eight months. 
Form H. Aerial mycelium, white, scanty at the top of the 
culture but denser at the base. Pycnidia numerous, dark brown, 
mainly aggregated at base of culture, on surface of medium or 
in aerial mycelium, larger than in E and F. Spore masses few 
and light brown. Fairly similar characteristics were shown on 
the other media, the mycelium varying, however, from white 
to dark grey. 
Form J. Aerial mycelium plentiful, white. Pycnidia few, 
large, brown, tending to be confluent; spore masses light 
brown to yellow. Pycnidia partly submerged in the medium. 
Generally, only few pycnidia were formed, except on potato 
cores and tomato stems, on which the number was large and 
their colour black. 
Form K. Aerial mycelium plentiful, white to dark brown- 
grey. Large aggregations of very dark-coloured submerged 
mycelium. No trace of fructifications. This form produced 
very few spores and in artificial cultures spores appeared only 
early in the development of the fungus and not on a distinct 
acervulus—at least no black acervuli were visible as in Form D; 
on tomato fruits the spores were aggregated on acervuli and were 
numerous, but the same dense cushion of mycelium covered 
with spores was not observed in any culture. 
Form K 2. This culture was similar to K, except that the 
mycelium was more scanty. Here again no proper acervuli 
were formed in culture except in one on tomato agar where a 
few black acervuli were visible. The sporing stage, as in K, 
could be seen from the pink tinge taken on by the mycelium 
in the early stages. 
