FusARiA OF Potatoes 



265 



also found, 3-septate very rare; chlamydospores mostly intercalary, 

 8-1 1m in diameter; color of spore mass, from white to yellowish; color of 

 plectenchyma, dense brown. 



Hab. On decaying tubers of Solanum tuberosum and on roots of Rubus 

 idceus, also in soil, Europe. 



The organism was not isolated by the writer, but was briefly studied 

 from a culture received through the courtesy of Dr. Wollenweber. 



2. Ramularia Magnusiana (Sacc.) Lindau (Figs. Ic and 50) 

 Cf. Wollenweber, H. W., Phytopath. 3:221, 234; Pis. xx, figs, f to h, 

 and XXI, fig. a. 1913. 



Conidia of the same type as those of R. eudidyma, also mostly 1-septate, 



Fig. 50. — -Ramularia Magnusiana. a, Conidia from aerial mycelium, b, conidiophores , 

 from 11-days-old culture in a petri dish on neutral hard potato agar: c, chlamydospores, d, sporo- 

 dochial conidia, from 51 -days-old culture on red raspbery cane plug; e, chlamydospores from 

 11-days-old culture in a petri dish on neutral hard potato agar; f, conidia from aerial mycelium 

 from 22-days-old culture on slightly acidified hard potato agar; g, sporodochial conidia from 

 153-days-old culture on hard lima-bean agar with 2 per cent glucose 



23.6x4.3 (18-27x3.5-5)//;^^ 0- to 3-septate conidia also occurring, not 

 numerous, sometimes catenulate ; plectenchyma from olive to coffee brown. 

 Much like R. Candida (Ehr.) Wr., differing from it by old rose color on 

 rice and by thinner conidia sometimes borne in chains. 0-septate chlamy- 

 dospores 10 X 11 (7-11 X 9-16) /x; 1-, 2-, and pluri-septate chlamydospores 

 also occurring. 



Hab. Common on tubers of Solanum tuberosum, also found on the 

 leaves of Trientalis and on the roots of Acer, in Europe and America. 



The fungus was isolated several times from rotted potato tubers. New 

 York, the tubers being covered with from a few to many, from dark brown 



M The size is after Wollenweber (1913 c : 234). 



