1903.] NATURAL SCIEXCES OF PHILADELPHIA. 353 



Schinzia celhdicola. ^lagnus denied that the similarity was sufficient 

 to class the two fungi together. Some work done by Gravis" led 

 Woronin to make a more detailed study of young galls upon Alnus. 

 Woronin was so much impressed with the resemblance to his Plasmo- 

 diophora brassicce, that he communicated to Gravis his belief that two 

 organisms were present, one a slime mould and the other a fungus. 



Since these preliminary observations similar galls have been found 

 on Alnus incana, Alnus serridata, Abius undulata, Ceanothus ameri- 

 canus, Myrica gale, Hippophce rhamnoides, and on species of Elceagnus 

 and Shepherdia, and last summer on Myrica cerifera by the writer. 

 The results of his study of the mycodomatia on the roots of the common 

 waxberry form the material for this paper. Tabulated the names of 

 the hosts on which mycodomatia occur and the names of the fungi 

 producing them is as follows : 



Alnus glutinosa Frankia alni (Moller) Atkinson. 



'' incana -... " 



" serrulata " 



'' undulata " 



Ceanothus americanus Frankia ceanothi Atkinson. 



Myrica gale Frankia brunchorstii Moller. 



" cerifera " 



Elceagnus — - Frankia cdni (Moller) Atkinson. 



HippophcB rhamnoides ..— " " " " 



Shepherdia '' 



A history of the synonymy is somewhat as follows: Woronin first 

 considered the parasite to belong to the genus Schinzia of Nageli. 

 Magnus showed the untenableness of this position. Woronin, after 

 more detailed study, referred the parasite to the slime mould genus Plas- 

 modiophora, and in this view he was supported by H. Moller,^ who 

 called it Plasmodiophora alni. Brunchorst,^ correctly interpreting 

 the nature of the parasite to be a true filamentous fungus, estabUshecl 

 the genus Frankia and named it Frankia subtilis, ignoring the oldest 

 specific name alni. Morller in 1890, by a study of fresh material instead 

 of alcoholic, set aside his former position and corroborated the observa- 

 tions of Brunchorst that the organism was a filamentous fungus. He 



* Gravis, "Observations anatomiques sur les excroissances des racines de 

 I'aune," Bulletin de la Societe royale de Botanique de Belgique, Tome XVIII, 

 partie I, pp. 50-60. 



"Moller, H., "Plasmodiophora alni," Berichte der deutschen botanischen 

 Gesellschaft, Bd. Ill, 1S85, pp. 102-105. 



*^ Brunchorst, "Ueber die Knollchen an den Wurzeln von Alnus und den 

 Elgeagnaceen," Botanisches Centralblatt, XXIV, p. 222, 1885. 

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