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Fig. 45. — Polyporiis sulphitreus. i, an entire fungus about one- 

 quarter nat. size ; 2, section through the same, showing the thick, 

 fleshy pileus at a, and the tubes, which have the cavity hned with 

 the hymeniuni, or spore-bearing surface, at /' ; 3, a basidium bearing 

 four spores, x 300. 



