SPORES HYALINE. 



first took it to be this species. Same shape, size, context, and general 

 coloration, though darker. On comparison, the pores are more minute, 

 but the main difference is in the spores, which are entirely of a dif- 

 ferent type, shape, and size. 



Compare Dela 



D. Pileus a hollow globe, bearing the pores on upper side of the interior. 



li" V'-,,.*W, 



Fig. 652. 



Polyporus volvatus. 



POLYPORUS VOLVATUS (Fig. 652). Pileus a hollow globe, 

 with an opening behind, bearing the pores on the upper side of the 

 interior. Sessile or with a false stipe. Surface smooth, with a thin 

 crust, usually the upper portion only colored with a reddish brown, 

 resinous stain. Pores small, slightly darker than the context, and with 

 darker brown mouths. Spores oblong, 4x12, hyaline, smooth. 



This most curious Polyporus occurs on spruce, both in our 

 eastern, western, and northern States. It seems to be absent from the 

 South. It is found also in Japan and China, but is unknown from 

 Europe. It proceeds from perforations of the bark caused by a beetle, 

 and Mr. Kawamura, of Japan, writes me that in Japan it is usually 

 stipitate, the stipe penetrating the hole. We think it will prove that 

 this is a false stipe of a mycelial nature, something like the mycelial 

 core that occurs in Polyporus rheades. As we have in a previous 

 publication given a history of the mistakes that were made in naming 

 the plant, we shall not repeat them here. 



SPECIMENS. A number, mostly from California, Canada, and New England. Japan, 

 A. Yasuda. 



Compare Helix, inflatus, obvolutus, Torreyi. 



313 



