EXPLANATION OF PLATE IV 



ASCOMYCETES 



FIG. I. Yeast cells of Saccharomyces cerevisiae ( SACCHAROMYCETALES ) 

 normally budding. X 550. (Redrawn from Reess. ) 



FIG. 2. Penicilliitm crustaceum (ASPERGILLALES). Conidial stage 

 seen in ordinary green mould. X 160. (Redrawn from Brefeld. ) 



FIG. 3. Penicillium crustaceum (ASPERGILLALES). Ascosporic stage, 

 the asci produced in skeins. X 500. (Redrawn from Brefeld.) 



FIG. 4. Uncimda nccator (PERISPORIALES). Conidia from the 

 powdery mildew of the grape. X 130. (Redrawn from Scribner. ) 



FIG. 5. Uncimda necator ( PERISPORIALES). Perithecium showing 

 hooked appendages and asci protruding from the crushed body. X 40. 

 ( Redrawn from Scribner. ) 



FIGS. 6, 7, 8. Successive stages in the sexual reproduction of Sphaero- 

 theca Castagnei (PERISPORIALES). Greatly magnified. (Redrawn from 

 Harper. ) 



FIG. 9. Peziza macropus (PEZIZALES). Natural size. (Redrawn 

 from Lindau. ); FIG. 10. Paraphyses, asci, and spores. X 200. (Re- 

 drawn from Rehm. ) 



FlG. II. Xylaria polymorpha (SPHAERIALES), showing habit; Fig. 

 12, section across the stroma showing perithecia ; both natural size. 



FIG. 13. Mitnda phalloides (HELVELLALES) ; natural size. 



FIG. 14. Peziza aurantia ( PEZIZALES) ; natural size. 



FIG. 15. Inside of half a peach pit showing perithecia of Caryospora 

 putaminum (SPHAERIALES) ; natural size. 



FIG. 16. Caryospora putaminum (SPHAERIALES) ; side view of peri- 

 thecium showing the ostiolum. X 15. (Redrawn from Winter. ) 



FIG. 17. Ceratostomella pilifera ( SPHAERIALES ). Three perithecia on 

 a fragment of wood, showing the long beak-like ostiola. X 30 ; Fig. 18, 

 ascus containing allantoid spores. Strongly magnified. (Redrawn from 

 Lindau. ) 



(23O 



