Sept. 1907] Proposed Genera of Phycomycetes. 205 



i8. Gymnosporangium Juniperi-virginianae Schw. — 

 Teliospores on Jiiniperus virginiana L. sown on Mains coronaria 

 (L.) Mill. 



19. Gymnosporangium globosum Farl. — Teliospores on 

 Juniperns virginiana L. sown on Crataegus Pringlei Sarg., Sorbus 

 americana Marsh., and Mains coronaria (L.) Mill. 



B. Species reported now for the first time. 



1. Melampsora Lini (Link) Desmaz. — Teliospores on 

 Linum usitatissimum L. sown on L. Lewisii Pursh and L. usita- 

 tissimum L. 



2. Uromyces SiLPHii (Syd.) i\rth. — Teliospores on /uncus 

 tenuis Willd. sown on Silphium perfoliatum L. 



3. Gymnosporangium Nelsoni Arth. — Teliospores on 

 Juniperus scopuloriim Sarg. sown on Amelanchier canadensis 

 (L.) Medic, and Sorbus americana Marsh. 



AN HISTORICAL REVIEW OF THE PROPOSED GENERA 

 OF PHYCOMYCETES. 



I. PERONOSPORALES. 

 GUY WEST WILSON. 



In the present consideration of the generic types of the Phy- 

 comycetes the genera will be arranged chronologically under each 

 order, with the type species, the synonyms, the homonyms, and 

 such other information under each genus as may seem desirable. 

 This is followed by an alphabetical list of the genera with their 

 type species, in which the tenable names are printed in black type 

 while those which are untenable are in common type. 



The subject of the generic types of the Phycomycetes was 

 first taken up at the suggestion of Dr. J. C. Arthur, while a 

 student in his laboratory, and the results embodied in a thesis 

 which was presented to the Faculty of Purdue University, to 

 the authorities of which institution I am indebted for permis- 

 sion to publish the material contained in the thesis. I wish to 

 also express my hearty appreciation of the courtesies shown me 

 by Dr. Arthur and by Dr. J. H. Barnhart in the way of critical 

 and bibliographical assistance and the loan of otherwise inacces- 

 sable books and by those in charge of the various libraries con- 

 sulted both in Lafayette and New York. 



