94 EXPLANATION OF FIGURES IN PLATES. 



PLATE II. PHYLLACTINIA CORYLEA. 



FIG 20 a, b. Ascogonium with four cells ; the apical cell uninucleated and nar- 

 rowed above by pressure of surrounding hyphae. Penultimate cell binucleated, 

 nucleus of basal cell in next section. 



FIG. 21 a, b. Ascogonium four-celled ; basal cell with two nuclei. 



FIG. 22. Ascogonium with five cells ; penultimate cell budding out in asco- 

 genous hyphae ; nuclei of second and third cells in another section. 



FIG. 23. Perithecial cells with resting nuclei and a metaphase stage of nuclear 

 division ; nucleolus near one pole of spindle. 



FIG. 24. Resting nucleus from mycelial hypha with central body connected with 

 chromatin. 



FIG. 25 a, b. Ascogonium with five cells ; penultimate cell budding out in asco- 

 genous hyphae; apical cell still connected to thick-walled antheridium. 



FIG. 26. Median section of older ascocarp, showing sections of ascogenous 

 hyphae, antheridium, etc. ; peripheral cells swollen, in some cases in preparation 

 for pushing out as hyphal branches. 



FIG. 27. Median section of still older ascocarp, showing portion of ascogonium 

 and sections of multinucleated ascogenous hyphae. 



FIG. 28. Section showing cells of ascogonium and ascogenous hyphae at stage 

 when latter become septate. 



FIG. 290, b. Sections showing the pushing out of the cells of the ascogenous 

 hyphae to form the young asci. 



FIG. 30. Median section of ascocarp just after fusion of nuclei in the young 

 asci; two or more layers of cells around the asci, with dense content and thin 

 walls ; peripheral cells on upper surface of ascocarp swelling out to form penicil- 

 late cells. 



