[From the Bulletin t>p the Tokrby Botanical Club 35: 543-554- tgofi) 



Studies in North American Peronosporales — IV. Host index 



Guy West Wilson 



The present host index of the North American species of the 

 order Peronosporales has been prepared with a view of bringing to- 

 gether in a convenient form for reference all the published hosts of 

 these fungi. The list has been made as complete as possible and 

 such cross-references as will facilitate its use are given, while care 

 has been taken not to overburden the index with useless synonyms. 

 No new hosts are recorded in this index and no attempt is made 

 to unravel tangles of synonymy or specific limitations, but the 

 index represents as completely as possible our present knowledge 

 of the host distribution of the commonly recognized American 

 species of the order. 



AIZOACEAE 

 Trianthema Portulacastrum L. 



Albugo Trianthemae G. W. Wilson. 



ALLIACEAE 



Allium Cepa L. 



Peronospora Schleideni Unger. 



ALSINACEAE 



Cerastium cerastioides (L.) Britton. 



Peronospora Alsinearum Caspary. 

 Cerastium longipedunculatum Muhl. 



Peronospora Alsinearum Caspary. 

 Cerastium nutans Raf. ; see C. longipe- 

 dunculatum Muhl. 

 Cerastium trigynum Vill. ; see C. ceras- 

 tioides (L.) Britton. 

 Cerastium viscosum L. 



Peronospora Alsinearum Caspary. 

 Cerastium vulgatum L. 



Peronospora Alsinearum Caspary. 

 Cerastium sp. 



Peronospora Alsinearum Caspary. 

 Silene antirrhina L. 



Peronospora Arenariae macrospora 

 Pari. 

 Silene sp. 



Peronospora Arenariae macrospora 

 Farl. 

 Spergula arvensis L. 



Peronospora Alsinearum Caspary. 



Tissa leucantha (Robins.) Greene. 



Albugo Lepigoni (de Bary) Kuntze. 

 Tissa marina (L.) Britton. 



Albugo Lepigoni (de Bary) Kuntze. 



ALLIONIACEAE 

 Allionia incarnata L. ; see Wedelia incar- 



nata (L.) Kuntze. 

 Allionia nyctaginea Michx. 



Peronospora Oxybaphi E. & E. 

 Boerhaavia anisophylla a. Gray. 



Albugo platensis (Speg.) Swingle. 

 Boerhaavia diffusa L. 



Albugo platensis (Speg.) Swingle. 

 Boerhaavia erecta L. 



Albugo platensis (Speg.) Swingle. 

 Boerhaavia hirsuta Willd. 



Albugo platensis (Speg.) Swingle. 

 Boerhaavia paniculata Rich. 



Albugo platensis (Speg.) Swingle. 

 Boerhaavia Sonorae Rose. 



Albugo platensis (Speg.) Swingle. 

 Boerhaavia spicata Choisy. 



Albugo platensis (Speg.) Swingle. 

 Boerhaavia viscosa Lag. & Rodr. 



Albugo platensis (Speg.) Swingle. 

 Boerhaavia Xanti S. Wats. 



Albugo platensis (Speg.) Swingle. 

 OxYBAPHUS NYCTAGiNEUS i~weet; see AUuh 



nia nyctaginea Michx. 

 Wedelia incarnata (L.) Kuntze. 



Albugo platensis (Speg.) Swingle. 



43 



