Sept, 1907] Proposed Genera of P hy corny cetes, 207 



7. PHYTOPHTHORA de Bary, Jour. Roy. Agr. Soc. 

 II. 12 : 240. 1876. 



The present genus was founded for a single species, Perono- 

 spora infestans, which is renamed Phytophthora infestans de 

 Bary. The species and its life history are discussed in detail 

 and illustrations are given (/. j, 4). A duly accredited reprint 

 of this article§ is usually cited instead of the original place of 

 publication. 



8. SCLEROSPORA Schroter. de Bary, Bot. Zeit 39: 

 621. 1881. 



The present name was used by Schroter* as a subgenus of 

 Peronospora, under which there was placed a single species pre- 

 viously described by Saccardo as Protomyces graminicola. The 

 first use of the name in a generic sense is in a paper by de Bary 

 in which he enumerates the valid genera of Peronosporaceae 

 among which is Sclerospora Schroter. The first binominal com- 

 bined with the generic name is in Cohn's Kryptogamen Flora 

 von Sclilesien|] where the type of the subgenus of 1879 becomes 

 S. graminicola (Sacc.) Schrot. Up to this time no other species 

 had been associated with the name Sclerospora whether regarded 

 as a genus or as a subgenus. 



9. GILLETIA Saccardo & Penzig; Sacc. Michelia 2: 

 587. 1882. 



The only species which is referred to this genus is G. spinu- 

 ligera Sacc. & Therry, of which the authors say "Oogonia ignota, 

 sed totus fungi habitus peronosperoideus." The fungus is co- 

 specific with Basidiophora entospora Roze & Cornu. The type 

 specimens of both these species were collected in France on 

 Leptilion canadensis (L.) Britton. The same generic name has 

 since been used in Commelinaceae.^ 



10. PLASMOPARA Schroter, in Cohn, Krypf. Fl. 

 Schles. 3: 236. 1886. 



Eight species were referred to this genus by its author 

 who founded it as "Gatt. Plasmopara. (Peronospora Sect. I. 

 Zoosporiparae und Sect. II. Plasmatoparae de Bary)." The 

 generic name is merely a modification of de Bary's second sec- 

 tional name, which implies that the conidia germinate by a plasma. 

 This is true only of de Barv's second section, the species of the 

 first germinating by zoospores. Two species, Peronospora pyg- 

 maea Unger and P. densa Rabenh., are included by de Bary in 

 his section Plasmatoparae of which P. pygmaea is the type. As 



§Jour. Bot. 14:105-126, 148-154. 1876. 



*Hedwieia, 18:86. 1879. 



113^:236. 1886. 



ifRendle, Jour. Bot. 84:55. 1896. 



