284 BOTANICAL GAZETTE [OCTOBER 
ciated with a vacuolated condition of the cytoplasm. Fig. 25 
shows a case in which the penultimate cell has developed into a 
second hook. The nuclei of the ultimate and antepenultimate 
cells have fused, but the fusion nucleus has not developed further. 
The penultimate cell of the second hook has given rise to an ascus, 
while the nucleus of the ultimate cell has migrated into the ante- 
penultimate and fused with its nucleus. 
The processes described above, by which either the ultimate 
Fics. 17-25.—Fig. 17, tip of ascogenous hyphae, showing form of hook and 
division of nuclei; fig. 18, binucleate penultimate and uninucleate ultimate and ante- 
penultimate cells; fig. r9, fusion of nuclei in penultimate cell and fusion of ultimate 
and antepenultimate cells; fig. 20, fusion nucleus in antepenultimate cell; 
migration of nucleus from antepenultimate to ultimate cell, followed by outgrowth of 
ultimate cell; fig. 22, formation of asci from both ultimate and antepenultimate cells; 
fig. 23, formation of hook from ultimate cell and ascus from penultimate; fig. 24 
formation of hooks from both ultimate and penultimate cells; fig. 25, case in which 
nucleus from antepenultimate cell migrated into ultimate and fused with nucleus of 
ultimate; a hook was formed from binucleate penultimate cell, the penultimate cell 
of which in turn gave rise to an ascus, while the nucleus of the ultimate cell migrat 
into the antepenultimate and fused with its nucleus; all X 1400. 
Fz 
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