144 MoitriKM.ocY \xi> rvnAsmsM or riiizoctonia. 



cjiii liMvc no (IouIpI ;is to tlic identity of tlic fuiiirus on ,i|i|ilc witli 

 fli.-it on potiito ;in(i liioniid nnt. 



It is (litticult to s:i\- wlictlicr H i/ijai/nms ov ('orl/cnnii is the 

 genus to wliiih iliis IVuctification should lie icfcni'd. Clinton ((i) 

 first suggest CI I tli.it ■' \]\v ('ortiriiiw stage is the same fungus descril)- 

 ed Iiv Pfillieux and Delacioix as Hi/poc/nnis solum ." iiolfs. liow- 

 ever. investigated thismattef and coiuluding that Cart id urn rm/um 

 B. & ('. nioiT uearlv i-epie.sented the fungus, he named it (\ rmjinn 

 B. & V. var. Solani. In a i-eview of tiiis paper liauiiert (IT) revived 

 the suggestion that the fruiting stage is not Cfirtic'ntni raxpnii. hut the 

 nearlv related 11 i/ikic/ihhs solnni. wiiich he deserihec] as occurring 

 in connection with I'hi-jicUniKt on Mclilotiis allxi. 'I'he spore mea- 

 surements given in this memoir agree closely with those of Rolfs; 

 as. howevei-. those of II ijjKichntis ocji rdlcuriis and //. shIudi are much 

 the same size, this point is hardiv diagnostic. It seems not impro- 

 bable that all three sjiecies are really oidy one fungus on ditTeieut 

 hosts ; in this connection it is interesting to note that some writers 

 doubt whether there is any distinction between IIi/jmh-Iddis and Cnr- 

 ticiiini. On the whole, since the descri|)tioii of Corticiiini rar/»;/( bv 

 Berkeley and Curtis antedates t hat tA II mxiclniKs sohaii In- Prillieux 

 and Delacroix, we are in* liniHJ to accept Rolfs" identification. 



There remains to lie di.scussed the connection lietwecn the 

 form of ItliiKiclniiiii with large sclerotia. and a basidiomycete fruit- 

 ing stage, and the /'. Sohnti Kiilin descrihed in the first ])art of this 

 memoir. In hoth cases the \-egetative liyj)ha' are similar, but the 

 sclerotia ditVer wichdy in origin, structure and size. Kiihii in his 

 original description of R. Sohtni makes no nu-ntion of the large scle- 

 rotia at all. anil moreover in our cultures the two forms remaineil 

 perfectlv distinct for a vear. heliaving as se])arate species. 



Hliizodovio rioldccii Tul.. liowe\cr. is de.sciibed (I'rillieux l22) 

 as possessing twodistimt forms of sclerotia. microsclerol ia. agreeing 

 with the small black .sclerotia identilit'd in this inemoii' as R. iSohnn 

 Kiihn, and macrosclerotia, resembling the large brown scleidtia which 

 occur in association with Corticiiiiii nujitvi. The species of Hliizoc- 

 loriia which iiolfs (24) identifies as li. Solani Kiihn possesses macro- 



