80 TWENTT-SIXTH REPORT ON THE StATE MuSEUM, 



Uncinula spiralis B. (& C. {W. Americana Howe.) 



Leaves of grape-vines. New Baltimore. Howe. Buffalo. Clin- 

 ton. Poiighkeepsie. Gerard. 



The very long appendages distinguish this from TJ. Anvpelojpsidis. 



Uncinula flexuosa Ph, 



Leaves of horse chestnut, JEsGulus Hippocastanum. Buffalo. 

 Clinton. 



The wavj-flexuous appendages are peculiar to this species, and 

 with its more numerous spores separate it from U. adunca to which 

 it is sometimes referred. 



Uncinula paryula G. <& P. 



Leaves of the hackberry, Celtis occidentalis. Poughkeepsie. 

 Gerard. September. 



MicROSPHiERA Russellii CUntou. 



Amphigenous ; mycelium arachnoid, evanescent ; appendages 

 8-18, very long, flexuous, colored, paler toward the tips which are 

 simple or one to three times divided ; sporangia ovate, 4-8 ; spores 

 4, elliptical, .0007-.0008 in. long. 



Leaves and petioles of the yellow wood sorrel, Oxalis stricta. 

 Buffalo. Clinton. North Greenbush. October. 



The scanty mycelium and colored appendages separate this 

 species from M. holosericea. 



MicRosPH^RA DuBYi Lev. 



J^Q2i\fi^ oihonej^wQViQ^ Loniceraparviflora. Buffalo. Clinton. 

 New Baltimore. Howe. Croghan. September. 



MlCROSPH^RA DENSISSIMA Schw. 



Fallen oak leaves. Saratoga. October. 



This is a very distinct species, forming definite orbicular patches 

 of dense white filaments. , 



Erysiphe Euphorbije Peck. , 



Mycelium thin ; conceptacles small, .0035 in. in diameter ; appen- 

 dages few, long, flexuous, colored ; sporangia broadly ovate, 3-4 ; 

 spores 3-4, large, .001 x .00065 in. 



Leaves of Euphorbia hypericifolia. Greenbush. October. 

 The mycelium occurs on both sides of the leaf, but conceptacles 

 were observed on the lower surface only. 



Peziza hesperidea C. & p. 



Among fallen leaves. Goat Island, where it was first found. 

 Clinton. Savannah. August. 



