Report of the Botanist. 41 



CercospoRa Apii Fres. 



Living parsnip leaves. Richmondville. Sept. 



Peronospora Ficaria Tul. 



Living leaves of crowfoot, Ranunculus recurvatus. Center. April. 



Peronospora Corydalis Be By. 



Living leaves of squirrel-corn, Bicentra Canadensis. Helderberg Moun- 

 tains. May. 



This form varies somewhat from the European form on leaves of Corydalis, 

 but perhaps not sufficiently to warrant its separation as a species. It usually 

 occupies the whole lower surface of the leaves. 



Peronospora gangliformis Berk. 



Living leaves of milkweed, Mulgedium leucophwum. Central Bridge 

 and Catskill Mountains. June and July. 



Verticillium lateritium Wit. 



Decaying wood. Buffalo. Oct. Clinton. 



POLYACTIS CINEREA Bw % ~k. 



Dead stems of herbs. Grreenbush. May. 



The fungus was found growing from a black Sclerotium. 



Penicillium bicolor Ft. 



Decaying fungi, leaves, etc. Sandlake. Aug. 



Spondylocladium tenellum n. sp. 



Patches thin, effused, subolivaceous ; flocci somewhat tufted, erect, slender, 

 simple or rarely branched, septate, brown, .006 -.014' high ; spores in 

 verticels of two to four at the septa, oblong, simple, pale, .00045'-.0005' 

 long, .00016'-.0002' broad. 



Dead stems of stone root, Collinsonia Canadensis. North Greenbush. 

 October. 



This species is distinguished from jS. fumosum by its simple spores and 

 the olivaceous hue of the patches, which to the naked eye appear like a thin 

 floccose tomentum. 



OlDIUM DESTRUENS n. Sp. 



Effused on large brown spots, odorous, whitish or pale cinereous; flocci of 

 two kinds, the sterile spreading, much branched, closely appressed to the 

 matrix, the fertile erect or decumbent, somewhat branched, forming monili- 

 form strings of spores ; spores unequal in size and variable in shape, elliptical 

 subglobose or angular, sometimes with an apiculus at each end, .0002-.0006' 

 long. 



Living leaves of Amelanchier Canadensis and Prunus serotina. Center 

 and Sandlake. May and June. 



This fungus quickly destroys the vitality of the leaves it attacks, but for- 

 tunately its ravages are not extensive, only a few leaves on a tree being 



