15 



pustules, however. This growth was so slow that, even supposing it 

 to have been a good case of transmission, I doubted if the fungus was 

 on congenial ground. At a later date, however, when making a 

 series of successful inoculations with the ripe rot from another source, 

 I obtained a similar result on the grape. From this it may be inferred 

 that certain inoculations though successful result in less robust growth. 



Ripe Rots and their Names. 



Whoever reads the literature of G-loeosporium will, I think, be- 

 willing to admit that there has been considerable readiness to describe 

 and name as specifically distinct a number of forms, mainly upon the 

 ground of their host-plant being one upon which species of Gloeosporium. 

 had not been previously seen. If, in addition to the novelty of the 

 host-plant, some small distinction in the size and form of the spores, 

 could be made out, there has apparently been very little hesitation in 

 doing what is commonly called " establishing a new species/' 



In the course of observations made upon a considerable variety of' 

 Gloeosporium inoculations I have often had occasion to observe the 

 diversity of form, size, colour, and structure that may be exhibited by- 



i 



X400 



Fig. 33. Spores from 

 an old pustule of the 

 Gloeosporium, fouud 

 growing naturally 011 

 the banana. Compare 

 these with their pro- 

 geny. (See Figs. 34- 

 39.) 



t 



5 



Fig. 34. Spores of the 

 Gloeosporium, ob- 

 tained by inoculating 

 the date-plum with 

 spores of the Gloeos- 

 porium found growing 

 naturally on the 



Fig. 35. Spores of the 

 Gloeosporium, ob- 

 tained by inoculating 

 a grape with spores 

 of the Gloeosporium 

 found growing natur- 

 ally on the banana. 



Fig. 36. Gloeosporiunu 

 spores, obtained by 

 inoculating a banana, 

 from a banana. These 

 are very much like- 

 the parent spores. 



the spores of a single species. With a change in the nature or 

 condition of the host-plant comes a corresponding change in the 

 resulting spores. Mature spores from young growths differ from those 



Fig 1 . 37. Spores from in- 

 oculation on date-plum, 

 secured by inoculating 

 with spores from the 

 Gloeosporium found 

 growing naturally on the 

 banana. 



Fig. 38. Gloeosporium spores 

 obtained by inoculating a 

 peach with spores from the 

 Gloeosporium, found growing 

 naturally on the banana. 



X400 



produced by the same growths at a later date, not only in size and 

 form and structure but also somewhat in colour. I observed that these 

 differences were not infrequently greater than those upon which various . 

 authors had founded new species. 



