Poria attenuala (Peck) Sacc. 



1 Microphotograph of cross section of the hymeniuni, x 160. 



a Projecting cystidium. 



b Cross section of a cystidium embedded in the trama. 



2 Vertical section of a part of a single tube showing obliquely 



projecting cystidia. x 320. 



Poria attenuata var. subincarnata Peck 



3 Fragments from specimens in the type collection, x i. 



4 Mature spores. 



5 Encrusted hypha from the subiculum on the growing margin of 



one specimen. 



6 Unencrusted hyphae as found in the trama and sometimes the 



subiculum. 



