THK PARASITIC KX"As KAK. 



163 



an- .somewhat curled up, ami the asci appear mi their lower 

 surface. 1 



Exoascus cerasi Fuck, occurs very commonly, mi cherry 

 trees ( /V/'///'s < '< /-it*//* ami /'. avium) both in Kurope ami America. - 

 It produces witches' brooms, which may be lar^e, upwardlv 

 directed, bush-like, and very conspicuous structures, with 

 numerous thickened and elongated twigs (Fin. .". ): m- they may 

 be .small, haimiii- bunches of twigs with upturned free ends. 

 The leaves are somewhat wavy, slightly Crumpled, and reddish: 

 on their lower epidermis they bear asci, and fall <>tf prematurely. 







l-'i'.. .-. \.iMuil twig 



i i.'iiy ii-'.in i tree in i : : 



(V. 'l'lll>rul Jilmt.) 



The bi-iiuiiis are vi-ible at a cmisidei-alile distance in the \vintei 

 i Fi-. Oti), while they are even imnv conspicuous during the 

 tlnWfi-in^ 36asOD ( l-'i'j. ~>7 ). At the latter time, liefure tlie 

 le.it'-lnids upeii, llie ehrrry t rces a re mu-mally covered \vilh 

 white blnouiii, while the 1 n' ..... us Lear leaves mily. ami rarely 

 blnssum. Hence they produce little m mi fruit. I h t ree 



\\'r|lllllT I I',','. /..il'lii'l |s!Hi' IM- t'nrill. itiiill nf till"''- \\l' 



1. MM, III-,. I K, lit. | 



i: Rathav, "Ubei dii I ! enbesen d. Kii -. -lili.iiiiiii-n s ,/,/,/ ,-. ,/. A'. A'. 

 l id II ... 1881. 



