Poria griseoalba (Peck) Sacc. 



1 Encrusted hypha from the subiculum. 



2 Hypha from the trama, showing the origin of the basidia. See 



text. 



3 Anastomosing hyphae from the subiculum. 



4 Microphotograph of cross section of the hymenium. x i6o. 



5 Mature spores. 



Polyporus induratus Peck 



6 Specimens in the type collection, x i. 



7 Hypha from specimens in type collection. 



• 132 



