372 



COMPARATIVE MORPHOLOGY OF FUNGI 



cells nc become the canal cells, the four cells pc the parietal cells. In 

 Fig. 248, 17, the former have divided into an upper daughter cell nc" 

 and a lower daughter cell nc'; at the same time the outer wall cells w 

 have divided into two daughter cells wo and wx. The perithecium 

 remains a long time in this condition. Before the maturity of the asci, 

 the cells nc" divide into four upper cells tc and four lower cells c; and, 



Fig. 249. — 1. Rhachomyces velatus. Habit; the perithecium has been liberated by 

 pressure on cover glass. 2. Stigmatomyces Sarcophagae. Normal and dwarf individual 

 where the perithecium aborted. 3. Kainomyces isomali. Mature individual. (X 195; 

 after Thaxter, 1908.) 



the cells wo into four cells wy and the four wz (Fig. 248, 20). The cells 

 wz are called lip cells, the cell rows tc, c and nc' , the canal cells; the lowest 

 row nc' gradually thicken their walls. The perithecium consists of 37 

 cells, the primary stipe cell p, the secondary stipe cell h, and the three 

 basal cells o, o' and o", the 12 wall cells n', wx and wy, the four lip cells 

 wz the four parietal cells pc, and the 12 canal cells tc, c and nc'. The 

 genetic homogeneity of these different cell groups may occasionally 

 be verified in the mature individuals by means of the protoplasmic 



