REPORT OF THE BOTANIST. 105 



tured and lacerated at the apex, white ; spores large, sub- 

 globose, rough, Math a thick epispore, yellow, about .0015' 

 in diameter. 



Leaves of spruce trees, Abies nigra. Adirondack Moun- 

 tains. August. (Plate 1, figs. 19-21.) 



I found this species very abundant on the low starved 

 spruces of the high summits and cold sphagnous marshes 

 of the Adirondack Mountains, attacking and discoloring the 

 foliage to such an extent as to give the trees a yellowish hue 

 even when seen at a distance. Minute brown or blackish 

 dots, probably the spermogonia of the fungus, are scattered 

 upon the affected leaves. 



Ptertjla setosa n. sp. 



Simple or branched, setose, about one-fourth of an inch 

 high, whitish or straw-colored with whitish tips, the branches 

 slightly diverging, clothed above with widely diverging hair- 

 like filaments; spores elliptical or subglobose, .00016'- 

 .0002' long. 



Decaying Polyporus elegans. AdirondackMts. Aug. 

 The plants grow rather thickly upon the matrix, and are 

 in appearance suggestive of prickles upon a burr 



Cladosporium Lignicola Cd. 



Birch chips. Indian Lake. July. 



Cladosporium Typhjs ScJiw. 



Dead leaves of Typha latifolia. Buffalo. Clinton. 

 This appears to differ from G. Herb arum in habit. 



OlDIUM CORTICALE n. Sp. 



Tufts minute, orbicular, convex, at first compact and 

 bluish-brown, then more lax and paler or cinereous ; flocci 

 few, nodose ; spores small, colored, subglobose or suban- 

 gular, .00016' in diameter, joined together in moniliform 

 strings. 



Old bark. North Greenbush. Oct. (Plate 2, figs. 7 

 and 8.) 



The strings of spores do not so readily break up into dis- 

 tinct spores as in most other species. 



Fusldium flavovireists Fr. 



Fallen leaves. Albany. Oct. 

 14 



