BOTANICAL GAZETTE. 



275 



hardly probable that the striking conidia could have escaped the 

 notice of earlier collectors. Entyloma Menispermi produces dark, 

 ill-defined discolorations on the upper surface of the leaves, 

 which are not thickened by the presence of the fungus. The 

 conidia form conspicuous, farinaceous, polygonal patches on the 

 under surface of the leaves, which they sometimes nearly cover. 

 The conidial stalks are more loosely branched than in the previ- 

 ously mentioned species and the conidial spores are stouter and 

 pointed at one end, measuring 11-24 p by 3.5-4 ft. The spores are 

 globose and smooth with thin walls, about 5.5-11 p in diameter. 



Entyloma Lobelice produces no marked distortions of the leaves, 

 but the plants infested have a whitish color, looking as if they 

 were attacked by some member of the Perisporiacew. Ill de- 

 fined yellowish spots are formed on the upper side of the leaves, 

 and gradually the whole leaf blackens and shrivels. The coni- 

 dia, although very abundant on the under side of the leaves, are 

 not so distinctly characterized under the microscope as those of 

 the last species. They are narrowly fusiform and measure 10- 25 p 

 by 2-3 p. The spores are larger than in Ent. Menispermi, but 

 smaller and decidedly more delicate than in Ent. Besseyi. 



The species above mentioned may be summarized as lollows : 

 A. Species destitute of conidia. 



1. Ent. Microsporum (Ung.) DeBary. 



On Ranunculus repens. Near Chicago. Prof. J. C. Arthur. 



2. Ent. Polysporum (Peck). 

 On Ambrosia trifida. New York. 



3. Ent. Linarije (Schrt.) 



On Veronica per egrina. Wisconsin. Trelease. 



B. Species with conidia. 



4. Ent. Compositarum Farlow ad int. 



Conidia fusiform or slightly clavate, often curved, 15-20 u long by 2-3 u 

 broad. Spores globose or somewhat angular, about 7.5-11.5 u in diameter, wall 

 thin and nearly colorless. 



On Aster puniceus and Ambrosia artemisicefolia. New England. 



5. Ent. Besseyi Farlow ad int. 



Conidia rod-shaped, becoming filiform, 20-45 u long by 1.5-3 u broad. Spores 

 globose, 7.5-15.5 u in diameter, average 12-15 u, yellowish brown, thick walled, 

 surface smooth or undulate. 



On Physalis. Iowa. Profs. Bessey and Arthur. 



6. Ent. Menispermi Farlow and Trelease. 



Conidia acutely ovate, 11-24 u by 3.5-4 u. Spores light colored, globose or 

 somewhat angular, smooth, with thin walls, about 5.5-11 « in diameter. 

 On Menispermum Canadense. Wisconsin. Prof. Trelease. 



7. Ent. Lobelia Farlow. 



Conidia narrowly fusiform, 10-25 u by 2-3 u. Spores light-colored, globose 

 or slightly angular, thin-walled, 8-15 u in diameter, average 7.5-11.5 u. 

 On Lobelia inflata. Gilead, Maine. 

 ?8. Ent. Kanunculi (Bon.) 



forma Thalictri. 

 On Thalictrum dioicum. Wisconsin. Trelease. 



