THE TRANSLOCATION OF PROTOPLASM 



145 



Fig. 74. — Rhizoctonia solani ( = Corticium solani), a Hymenomycete. To illustrate 

 the enlargement of vacuoles in mycelial hyphae which have ceased to grow and 

 the translocation of protoplasm from cell to cell. A, a main hypha and two 

 lateral branches ; the vacuoles are small and fixed to the cell -wall ; the proto- 

 plasm was observed flowing en masse along the hyphae and through the pores 

 of the septa in the directions indicated by the arrows. B, part of a mycelial 

 system from which protoplasm was passing out ; the lateral hyphae a, b, c, 

 and d have already evacuated their protoplasm and are now dead ; the main 

 hypha is highly vacuolated and its vacuoles are growing in size. C, D, and E, 

 three stages in the evacuation of protoplasm from a terminal cell. C, the 

 terminal cell a and the subterminal b, separated by the septum c, are evacuating 

 their protoplasm ; there are nine vacuoles in a, the largest at the apex of the cell. 

 D, about two hours later ; the vacuoles in the terminal cell have now become 

 reduced to one ; a little heap of protoplasm is passing through the pore of the 

 septum from a to 6. E, about half an hour later ; the terminal cell has 

 evacuated its little heap of protoplasm ; it died less than two seconds ago, at 

 which time it lost its turgidity ; the subterminal cell has blocked up the pore 

 of the septum and has pressed the septum out convexly into the dead terminal 

 cell. Magnification : A, C, D, and E, 1000 ; B, 467. 



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