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RESEARCHES ON FUNGI 



Fig. 79. — Rhizopus nigricans. Evacuation of protoplasm, the formation of a 

 septum, and changes in turgor in a two-days-old mycelium grown in a hanging 

 drop of 10 per cent, cane-sugar and gelatine. A : part of the mycelium con- 

 sisting of the hypha a and its two terminal branches b and c (shown full-size 

 in B), represented as if seen in a median-longitudinal section ; at present 

 a, b, and c are filled with dense protoplasm and are non-septate. B, about 

 12 hours after A : the hyphae b and c, concomitantly with the formation of, 

 and presumably with the aid of the pressure of, the very large vacuole d, 

 evacuated their massive protoplasm which passed into the hypha a and so 



