EXPLANATION OF PLATE IV 



ASCOMYCETES 



Fig. I, Yeast cells of Saccharoniyces cerevisiae ( Saccharomycetales ) 

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



Fig. 2. Penicilliiim crustaceiim (Aspergillales). Conidial stage 

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



Fig. 3. Fenicillii/ni crustaceiivi (Aspergillales). Ascosporic stage, 

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



Fig. 4. Uncmtila necator (Perisporiales). Conidia from the 

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



Fig. 5. Uncmtila 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 macroptis (Pezizales). Natural size. (Redrawn 

 from Lindau.); Fig. id. Paraphyses, asci, and spores. X 200. (Re- 

 drawn from Rehm. ) 



Fig. II. Xylaria polymo7-pha (Sphaeriales), showing habit; Fig. 

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



Fig. 13. Mitrula pJialloides [YiYAA'^AA^M^YS) \ natural size. 



Fig. 14. Peziza anrantia (Pezizales) ; natural size. 



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

 putamiman (Sphaeriales) ; natural size. 



Fig. 16. Caryospora putaminum (Sphaeriales) ; side view of peri- 

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



Fig. 17. Cerato5toj?iella pilifera {^'PUAKKiKLES). 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. ) 



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