206 Journal oj Mycology [Vol. 13 



1. ALBUGO Roussel. Fl. Calvados, ed. 2. 47. 1806. 



The name Albugo was first used for a subgenus by Persoon* 

 who included under it the white spored species of Uredo, of which 

 he recognized two, U. Candida and U. Cheiranthi, the first of 

 which is the type species. Roussel elevated the subgenus to 

 generic rank with Persoon's first species as the monotype of 

 the genus. In this species he followed Persoon in including the 

 white rust of the Crnciferac and of Tragopogon, and by way of 

 good measure added some fungus on Urtica which in all prob- 

 ability belongs to the Uredinales. The genus is usually credited 

 to S. F. Grayj who used the name in the same sense fifteen 

 years later. 



Synonym : Cystopiis Lev., not Blume. 



2. PERONOSPORA Corda, Icon. Fung, i: 20. 1837. 

 This genus was published for a single species, P. rumicis, 



which is figured on pi. 5. f. 2j^. 



3. BREMJA Regel. Bot. Zeit. 1:666. 1843. 



The only species which has so far been referred to the 

 genus is B. Lactncac Regel, a fairly good figure of which (pi. ?5) 

 accompanies the description. 



Synonym: AcUnohotrysY{.o^vci. 



4. CYSTOPUS Leville. Ann. Sc. Nat. III. 8: 371. 1847. 

 The genus is characterized and five species of livedo, of 



which the first is U . Candida, are cited as members of the genus. 

 Except the last species named these are all congeneric. While 

 it is customary to credit to Leville the names of all these species 

 under the genus Cystopiis, he refrained, not only in this but in 

 subsequent papers, from forming the combinations with which 

 he is so generously credited by his contemporaries. The name 

 is untenable as the genus is a typonym of Albugo. It has also 

 been applied to an Orchidaceous^ genus. 



5. ACTINOBOTRYS Hoflfman. Bot. Zeit. 14: 154. 

 T856. 



But one species, A. Tulasnei, was described, the figure of a 

 portion of the conidiophore of which (pi. 5. /. 22) is unmistak- 

 ably that of Bremia Lactiicae Regel, 1843. 



6. BASIDIOPHORA Roze & Cornu, Ann. Sci. Nat. V. 

 II : 84. 1869. 



This genus is founded on a single species, B. entospora, which 

 is described at great length and carefully figured {pi. 4). 

 Synonym : Gilletia Sacc. & Penz. 



*Syn. Meth. Fung. 223. 1801. 



tNat. Arr. Brit. PI. i :540. 1821. 



XCystopus Blume, Orch. Archip. Ind. 82. 1858. 



