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COMPARATIVE MORPHOLOGY OF FUNGI 



solved and the four nuclei lie in one cell (Fig. 252, 3). Now the basal 

 cell is formed, so that the lowest of the four nuclei is separated in a 

 restored trichophoric cell. The middle nuclear pair increases in size and 



Fig. 252. — Development of asci in Laboulbenia Gyrinidarum and L. chactophora. 1. 

 Mature archicarp. 2. The nucleus of the carpogenic cell has divided, that of the tricho- 

 phoric cell is dividing. 3. Plasmogamy completed. 4. Row of cells consisting of the 

 basal uninucleate supporting cell, the basal binucleate supporting cell, the fertile cell and 

 the upper binucleate supporting cell. 5. Longitudinal section of ascogenous cell. 6. Two 

 active ascogenous cells. 7 to 9. Development of ascospores. (1, 4 X 300; 2, 3, 5 X 400; 

 6 X 900; 7, 8 X 1,200; 9 X 600; after Faull, 1912.) 



divides conjugately. The upper cell becomes a sterile cell and the lower 

 alone remains fertile. Its nucleus divides again and cuts off a binucleate 

 fertile cell (Fig. 252, 4). Hereupon it may form the fundament of the 



