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PLATE XIX. 
A group of sporophores of Polyporus pargamenus that have 
revived and made a new growth the second year. The sporophores 
in the left hand row show the formation of a new hymenial layer 
over the old one, which, in the sporophore at the bottom of the 
row, has not only entirely obliterated the old sporophore but has 
grown out beyond the margin of it, thus increasing the size of the 
pileus. The sporophores in the right hand row show the formation 
of a new mold-like growth over the upper surface of the sporo- 
phores and the marginal additions to the old pilei resulting from 
the new growth. 
