If) Jan. lOOf).] 



Mvcological Bulletin No. 50 



199 



l'"ir,. 157. — Yellow Ci.uster-cups. or the Ac-cid'-i-um that grows on the Elder and 

 ilis'..rts Ihc hranchlets and leaves. At h a ripe "cup" is shown; one of the germinat- 



inji spores mi re iiiphly mnjinificd i'; figured at c. 



