620 Eumycetes. 



Under E. crocontrn then he lists the following provisional syno- 

 nymy: Tuber parasiticiim Bull. (1791), Sclerotium Crocorum Pers. 

 (1801), Rhisoctonia Crocorum. DC. (1815), Rhizoctonia Medicaginis DC. 

 (1815), Thanatophytum Crocorum Nees. (1816), Tuber Croci Duby 

 (1830), Rhisoctonia Rubiae Dcne (1837), R. Dauci Rabenh. (1859), R. 

 violacea Tul. (1862), R. Asparagi Fckl. (non Fr.) (1869), Hypochnus 

 violaceus Eriks. (1913). 



This organism occurs throughout a considerable part of Europe 

 where it attacks a large variety of plants representing many fami- 

 lies, mostly dicotyledonous, while in America it has been. found 

 in a few scattered localities on allalfa and potato tubers. 



The description of the general Symptoms, the m3^celium and 

 sclerotia, including the infection cushions are similar, to a large ex- 

 tent, to those given by L. & C. Tulasne for R. Crocorum DC. and 

 R. medicaginis DC. which they include under the name R. violacea Tul. 



The common American species of Rhisoctonia , R. Solani Kühn 

 {Corticium vagum B. & C.) is widely distributed in America and 

 elsewhere and probably occurs on the potato in most regions ot 

 the World where it is grown. Although it has been recognized in 

 central Europe on potatoes and occasionally on the beet, yet no 

 careful work has been bestowed on it and European workers ap- 

 pear to be unfamiliar with it. The fungus is found on many host 

 plants representing many families of the dicotyledons and so far 

 has been reported on onl}'^ one monocotyledonous host. 



He discusses the Symptoms under the following Classification: 

 1) damping off, 2) potato diseases, 3) rot of fleshy roots, 4) stem 

 and root rots of herbaceous plants, and 5) fruit and leaf injuries. 

 Under the heading potato diseases, he gives the following main 

 types of injury which are recognized for the potato: 1) black speck 

 scab or sclerotial stage, 2) Rhisoctonia scab, 3) Rhisoctonia rot, 4) 

 stem lesions and root rot, 5) rosette and leaf roll, and 6) little 

 potato and aerial potato. 



The description of the morphological characteristics of the hy- 

 phae and sclerotia are similar to the description the author gave in 

 earlier papers on the fungus. 



In regard to the perfect stage of Rhisoctonia Solani, first de- 

 scribed by Burt in 1903, he accepts the conclusion that Corticium 

 vagum B. & C. is the perfect stage of this fungus. Thus, under 

 Corticium vagum B. & C. he lists the following synonvmy: Rhisoc- 

 tonia Sotom Kühn (1858), R. Betae Eidam (non Kühn) '(1887), Ä. 

 Napae West (1846), R. Rapae West (1852), Hypochnus Solani Prill. 

 & Del. (1891). 



From a study of the descriptions in the litterature and an exa- 

 mination of exsiccati material he finds the following species maybe 

 excluded from Rhisoctonia: Rhisoctonia Allii Graves, R. bicolor EIL, 

 R. Brassicarum Lib., R. muscorum Fr. 



From a study based on descriptions alone, he believes that the 

 following species have insufficient affinities with Rhisoctonia to be 

 included: Rhisoctonia aurantiaca Ell. & Ev., R. Batatas Fr., R. pla- 

 centa Schw., R. radiciformis Schw., R. destruens Tassi, R. monili- 

 formis Ell. & Ev., R. Strobi Scholz, R. subepigea Bertoni. 



Peltier (Urbana). 



Garman, P., Some Porto Rican parasitic fungi. (Mycologia. 

 VII. p. 333-340. f. 1 and pl. 171. Nov. 1915.) 

 Contains as new: Septoria Petitiae, S. Miconiae. S. Guettardae, 



