312 BOTANICAL GAZETTE. 



This common form on Umbel! if ercr, in Europe is unknown to me in the 



United States, except from the catalogue of Harkness and Moore, on whose 



authority the species is inserted, the description being founded on European 



material. 



Section II. Basidiophora. Conidiophores simple, surmounted by a 

 number of sterigmata. Germination by zoospores. 



6. P. entospora (Cornu & Roze) B. & Br. 



Basidiophora tvtoxpora Cumii it Roze Ann. Sci. Nat. 

 ome Serie T. XI. p. 89. PI. IV. f. 1-12. 



P. entospora B. & Br. Grevillea, I. 20; Proc. Am. Acad. XVIII. 73. 

 P. Basidiophora Cornu Bull. Soc. Bot. France, XXV. 294. 

 P. simplex Peck, 31st Kept. X. Y. But. p. 15. 



Conidiophores simple, stout, clavately swollen at the tip with 

 numerous sterigmata on which are borne the very large, 26-32 -q 

 long, broadly ^ovate, papillate conidia. Oospores large, 34-41//. 

 in diameter, exospore marked with ridges. 



On Aster Nova Anglia, Erigeron Canadense and Solidago rigida. Oospores on 

 Aster and Erigeron. 



New York (Peck) to Illinois (Burrill) and Wisconsin (Trelease). France) 

 England, Germany. 



Probably common in the United States, but first found in France, where it 

 was probably introduced from America. It occurs from May to October, pro- 

 ducing rather insignificant discolorations of the leaves. It has not yet been ob- 

 served in New England. One of the most peculiar species of the genus, char- 

 acterized by its simple conidiphores and very large conidia borne on sterigmata 

 and perhaps rather to be regarded as a generic type. 



Section III. ' Plasmatorar^e. Conidia white, in germination the whole 

 contents being discharged and forming a free globose cell from which grows a 

 tube. 



7. P. pygm^a Unger. 



De Bary 1. c. PI. VII. f. 10-15 ; Bull. Buss. Inst. II. 233 ; 29th Kept. X. Y. Bot, p. 5 ; 



30th Kept. p. 77; Cat. Paeif. Fung. p. 29. 

 Exs. Myc. Univ. 924; Ellis N Am. Fung. 211. 



Mycelium large, haustoria small, obnvate. Conidiophores 

 short, stout, unbranched except close to the apex where there are 

 a few rudimentary branches. Conidia ovate, 20-26 p. by 15-19 

 //., papillate. Oospores large, dark brown, thick-walled, 45-53 n 

 in diameter, exospore slightly rugose. 



On Anemone nemorosa, A. Pennsylva/nica, and Hepatica triloba. 



Mass. (Farlow), New York (Peck), Illinois (Seymour), to California 

 (Harkness). Europe. 



A common species on A. nemorosa in the Eastern States dining the spring 

 and early summer, often accompanying other fungi. I have been able to ex- 

 amine specimens on A. nemorosa only where the conidiophores are stout and 

 scarcely branched at all. "What is called by De Bary var. elongata I have not 

 seen in this country. 



►Section IV. AcroblastvE. Conidia white, germinating by a terminal 

 tube. Ramification dichotomous. 



