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EXPLANATION OF PLATE IV. 



FUSICLADIUM DENDRITICUM, Wdllr. 

 Page 32. 

 Fig. 1. Fungus spots on an apple. 



Fig. 2. Threads of the fungus x 400. The three lower much elongated. 

 Fig. 3. Twelve spores of various shapes x 400 ; two still attached to the threads. 



Penicillium glaucum, Lk. 

 Page 33. 

 4. Decayed fungus spot on an apple, with tufts of the fungus in the center. 

 A small fragment of the apple with seven tufts of the fungus. 

 A few plants magnified. 

 A tuft of the variety coremium magnified. 

 An elongated branched plant magnified. 

 A plant x 400. 

 Six spores 400. 



OlDITJM FRUCTIGENUM, PerS. 

 Page 34. 

 Fig. 11. Tufts of the fungus on an apple. 



Fig. 12. A fragment of the apple, with six tufts of the fungus. 

 Fig. 13. A tuft of the fungus magnified. 



Fig. 14. Three threads of the fungus bearing strings of spores x 400. 

 Fig. 15. Three spores x 400. 



Sph^ropsis malorum, Berk. 

 Page 36. 

 Part of the surface of an apple dotted by the fungus. 

 A fragment of the apple with a single perithecium bursting through the 



epidermis magnified. 

 A perithecium magnified. 



A vertical section through the center of a perithecium magnified. 

 A tuft of spores taken from the perithecium magnified ; some of them 

 immature. 

 Fig. 21. Five spores x 400 ; one of them with its pedicel still attached. 



Fig. 



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Fig. 



20. 



