VKK.MK ri.AKI \. 171 



Vermicularia trichella Fr. oi-.-inx i.u living Icavrs . .f i\-\ ami ntlnT plants. 

 (Britain.) 



V. ipomoearum S.-lnv. ()n species f //<, ,/.,.,/ in .\iin-n<-a. 



V. microchaeta l'a-<-. < )n living l.-a\. ' Camellia japonica in ItaU. 



V. circinans lit-ik. Onion n.t in Mritain aii'l I'.S. Ain-ii 



Placosphaeria and Cytospora aiv genera containing forms 

 parasitic on living plants, but of little practical importance. 



I'lIAEOSPOKAI. 



Coniothyrium. 



1'ycnidia brown or black. ( 'onidia brown, unicellular, -pln-n.id 

 or ovoid, and burne on short conidiophoiv-. 



Coniothyrium (Phoma) diplodiella Sa. c. 1 \\' bite-rot of t la- 

 vine. Tins disease has a wide distribution in Hun^aiy. and ha- 

 also been observed in France, Italy, and America. It lias caused 

 considerable damage, especially in Northern Italy, win-re it \va- 

 for a Ion- time regarded as the black-rot. 



According to ]\le/ey, this parasite is distinguished from 

 /,/. .^inli,i (black-rot) in the following jioints : The pyciiidia 

 and conidia are larger; the mature pyciiidia are uivyi-h or 

 li^ht brown (never black), tin.- mature conidia are brownish. 

 The disease attacks the fruit only, can-in-' it to fall off. h'athay. 

 however, states that it also attacks youn^ shoots, infection takin- 

 pla<;e from the fruit. I >i-ea-ed -rape< become >oft, rotten, and 

 wrinkled; the rid-es are beset with pyciiidial ]pii>tule-. as in 

 black-rot, but the -rajies ne\-er become brittle and hard. 



Viala and Uavax- have recently succeeded in rearin- ]H-ritheei;i 

 from twi-s and fruit-stalk- ,-et in >tei-jli/ed moist >and. N.>ne 

 could be found on -rape-. The pcritliecia are -lobiilar, eiicl. 

 in a black coverin- sevei'al cells thick, and \\iib a lar-e ciatei - 

 like apertui'c. The a8Ci and paraph\.-es arise onl\ IMMU the depth 

 of the pei ii heciiim, the laller bcin- lon-er than the fiamer and 

 iVeniirnlly branched. The a-cj are cluli->haped and shoi I --l.dked. 

 and contain ei-hl .spindlc-.-haped coloiii'li--- or \ello\\i-h a 

 Spores, di\'ided by one to tlnve cro epta. They jemiinati- and 



one "r more gerui t ubi 



1 Kailiay, "Der White-Rot," /' n .////-/'... 



(Ji-inT.il di-.^ci ijitimi in /,'/.<./' !l, A ) I I--'! ^ ' 



- Viala ami Kav.i/, t'.^iif.f. ,.,/./., .\i\, Is'.M, \>. ll.'i. 



