H 
F. T. Brooks and S. R. Price. 
At a later date one of a consignment of tomato fruits grown 
under glass in the neighbourhood of Cambridge was found to be 
affected with the same fungus, the pycnidia, spores, and characters 
when grown on artificial media being identical with those of the 
fungus isolated from tomatoes grown out of doors. 
Identification of the Fungus on Tomato Fruits. 
As yet few fungi with pycnidial fructifications have been 
described as causing diseases of tomato fruits. Plowright 1 in a 
paper on diseases of tomatoes mentions Phoma destructive* and 
Sphceronema lycopersici as causing rots of the fruit. The former 
fungus was associated with a species of Cladosporium and a species 
of Macrosporiwn, both of which Plowright considered to be stages 
in its life-history; but in the absence of culture and inoculation 
experiments it is impossible to say whether this was really the case 
or whether either of these forms was the actual cause of the rot. 
The characters of Sphceronema lycopersici as given by Plowright 
agree more closely with those of the fungus with which this paper 
deals and it is possible that they are identical, but Plowright’s 
description of the fungus is too meagre to enable the identity to be 
established. Massee 2 mentions a pycnidial stage as occurring in 
the life-history of Macrosporium solani, Cooke, which is now 
considered to be identical with Macrosporium tomato, Cooke, the 
cause of the common black rot disease of tomato fruits, but the 
characters of the pycnidia do not agree with those of the fungus 
with which we are now concerned. 
Massee has recently described the occurrence on tomato plants 
in England of the fungus Diplodina citrullina, Grossenbacher, or 
Ascochyta citrullina, C. O. Smith, as it is sometimes called, this 
fungus being the pycnidial stage of Mycosphcerella citrullina, 
Grossenbacher. Massee 3 describes this fungus as attacking in an 
epidemic manner the stems of tomato plants grown under glass. 
One of us has also had the fungus under observation in Cambridge¬ 
shire where it has attacked plots of out-door tomatoes for two 
seasons in succession. In these cases the lower part of the stem 
was the region attacked, the cortex being partly destroyed. It 
occurred to us that the fungus on the tomato fruits might be 
identical with the Ascochyta citrullina mentioned above. The 
characters of the pycnidia and spores of the fungus on the fruit 
closely approached those of Ascochyta citrullina on the stems of 
' Plowright, C. B. The Gardeners' Chronicle, 1881, p. 620. 
2 Massee, G. Diseases of Cultivated Plants and Trees, p. 503. 
3 Massee, G. Keiv Bulletin, 1909. 
