EXPLANATION OF PLATE IV. 
FUusICcLADIUM DENDRITICUM, Wallr. 
Page 32. 
Fungus spots on an apple. 
- Threads of the fungus x 400. The three lower much elongated, 
. Twelve spores of various shapes x 400; two still attached to the threads, 
PENICILLIUM GLAUCUM, Lk. 
Page 33. 
Decayed fungus spot on an apple, with tufts of the fungus iu 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, 
9. A plant x 400. 
Six spores 400. 
O1p1UM FRUCTIGENUM, Pers. 
Page 34. 
. Tufts of the fungus on an apple. 
A fragment of the apple, with six tufts of the fungus, 
. A tuft of the fungus magnified. 
. Three threads of the fungus bearing strings of spores x 400, 
5. Three spores x 400. 
SPHAROPSIS 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. 
. Atuft of spores taken from the perithecium magnified; some of them 
’ 
immature, 
Five spores x 400 ; one of them with its pedicel still attached, 
