Manchester Memoirs, Vol. Ivii. (191 3). ^^o- 8- 7 



In such cases one cell was apparently devoid of 

 nucleus, whilst the contiguous cell contained two nuclei 

 or a single nucleus of about twice the normal size. 

 {Text -fig. I, 1—5.) 



Microtome sections shewed in intercellular positions 

 hyphal dilations containing two nuclei {PL I., Fig. 5), 

 and in cases where the adjoining cells could be distin- 

 guished there was good reason to think that fusion had 

 occurred. {PL I., Fig. 6.) Not infrequentl}' such intercel- 

 lular hyphal swellings contained a single nucleus of about 

 twice the normal size. {PL /., Fig 7.) 



Woronin did not a.ssert a fusion of the structures he 

 described although his Fig. 3 would indicate that such 

 had taken place. His archicarp and applied hypha are 

 exactly paralleled by mycelial dilations of purely somatic 

 value, and from my study of this form I find it difficult to 

 believe that the former are of reproductive character. 

 The lower portion of his Fig. 5 shews a fusion resembling 

 more nearly those I have seen — fusions which bear marked 

 likeness to those described for Pleospora JietharunL by 

 Cavara and Mollica (3). 



From immediately adjoining cells arise fine hyphal 

 branches, which apply themselves closely about the central 

 cell or ascogonium. In macerations this appears as a 

 few closely entwined hyph^e {Text fig. i., 6 — 9), whilst 

 in microtome sections a large, more deeply stained uni- 

 nucleate cell is seen, surrounded by smaller cells. {PL /., 

 Figs. 8—10.) The enveloping hyphae increase in size and 

 number, enclosing the ascogonium, until a small spherical 

 lenticular mass is formed. 



The fusion nucleus divides {PL I., Fig. 11}, and the 

 ascogonium septates into a number of multinucleate cells 

 {PL /., Fig. 12), from which arise ascogenous hyphae. 



