EXOBASIDIUM. 153 



C. salicinum. 



Effused, spreading over willow bark, dark purple at first, 



then pruinose with the white spores swelling when moist, 



becoming membranaceous when dr3\ 



Common on willow branches throughout the Valley. Received the 

 name from its growing on willow. 



C. Sambucum. 



Effused on elder bark, white, cracked when old and dry. 

 Common on dry elder bark. 



C. ochraceum. 



Effused, even, waxy, white at the circumference, ochraceous 

 towards the center. 



On hemlock boards in lumber yards. 



C. incarnatum. Flesh-colored Corticium. 



Waxy when moist, rigid when dry, agglutinate. 

 Hymenium, red, flesh color. 

 Common on dead chestnut trees in our woods. 



C. cinereum. Fr. Ash-grey Corticium. 



Waxy when moist, rigid when dry, agglutinate. 



Hymenium, cinereous, with a delicate bloom, which when 

 examined are papilloid elevations. Cooke has made a separate 

 genus on this character, and named it Peniophora cinerea. 



Common on dead branches. 



Genus LXV. EXOBASIDIUM. Pk. 



Tuberculate, green, covered with a white bloom when shed- 

 ding spores. Parasitic on ericacese. 



