NORTH AMERICAN PARASITIC EXOASCEyE. 121 



ExoAScrs lAK i.owii S(i(h'/i. deforiiiin>4 the fruit ;ind H )ral envelopes of — 

 PriiiiKS xcrofiiKi Ehrh., Wild IJiack C.'ierr_\-. 



ExoA.scL's CERAsi (Fiic/^.) Sdtlci'. rausiiii^ " witclu's' brooms" and deforming 

 leaves on — ■ 



J^riiiins piinisv/i'diiiid Linn., Wild l^cd Clierr_\'. 

 /'. Iiort iiltniii I5aile\', \Vild (joose Plum. 

 P. (iciiiissd (Nutt.) W'alp., Western Choke Cherrv. 

 J', av'uiiii Linn., Ma//ard and Sweet Cherries. 

 Miner Plum, Wild I'lum of the Central States. 

 P. scroti II a Ehrh. 

 /'. v'lrglii'utna Linn. 

 P. aiiifncamt Marsh. 



Exf)A.scLs I'LRPLRAscENs [Ell. tl'- /irvT.) Sudt'b. affec ing leaves of — 

 Rliiis Ci^puViiiui Linn., Dwarf Samach. 



Exo.v.scu.s i)Ei'()K.M.\x,s (^Bi'rk.) I'ncL-vl affecting leaves and sometimes sprouts, 

 of— 



Piniiits pcrsica Sieb. & Zucc, Peach. 

 P. cliicasa Michx., Chicasaw Plum. 



ExoASCUS .E.scLLi [Ellis it'- Evcrliart) affecting leaves and twigs of — 

 ^EscuIks rdlifdniirci Nutt., Californian Horse Chestnut. 



ExoASCUs )3ACTERio.si'ERMLs (yo//diis.) Sddcb. affecting leaves of — 

 Bet Ilia lid lid Linn. 

 B. gland III osd Michx. 



ExoA,scu.s AMEXTORUM Sddfl>. affecing the bracts of fertile catkins of — 

 Aliiiis i/icdiid Willd., Speckled Alder. 

 A. scrnihrtd Willd., -Smooth Alder. 

 A. r/i/nui. 



Taphrina acrea {Pcrs.) P'rics. caus^ing spots on leaves of — 



Popiilits dilaiatd, / t i. 1 n 1 

 13 JT ,• . • Lombardy Poplars. 



P. jastlgdtd, \ ^ ' 



P. bet iiUf olid. 

 P. petrovsky. 

 P. ccrfiiiciisis. 



Taphrina joha.\".s)Xii Sdde'>. attacking ovaries of — 

 Popidiis trciiiiiloidcs Mich.v., American Aspen. 

 P. graiidideiitdta'MlcXw., Larger American Aspen. 

 /-'. frcinoiitii Wats. 



Tapjirixa carnea yo/idiis. causing spots on leaves of — 

 Bet /lid nana Linn. 



Taphrina ccerule.scens (Mont, d- IJi'sii/.) I'lil. causing spots on leaves of 

 ^iierciis macrocarpa Michx., Bur Oak. 

 J^. coccinea Wang., Scarlet Oak. 



i^. coccinea var. tinctoria Gray, Yellow-barked or Black Oak. 

 ^. falcata Michx., Spanish Oak. 



