Repoet of the Botanist. 95 



This is a very distinct species. Tlie brandies at tlie tips of the 

 appendages are slightly curved and diverge nearly at right angles 

 to the appendage. When mature the plants often become collected 

 in entangled masses, giving the leaf the appearance of being coated 

 with dusty cobwebs. 



MlCROSPHiERA PULCHRA C. C& P. 



Amphigenous; mycelium thin, persistent; conceptacles numer- 

 ous, globose, black ; appendages eight to twelve, about equal in 

 length to the diameter of the conceptacles, colorless; sporangia 

 four or five, containing foRr to six spores. 



Leaves of Cornus dlternifolia. Greenbush. September. 



The mycelium is more conspicuous on the. upper than on the 

 lower surface of the leaves. The conceptacles are often closely 

 placed over large portions of the leaf. 



Mtcrosph^ra diffusa G. (& P. 



Mycelium thin, evanescent ; conceptacles minute, globose, black ; 

 appendages numerous, eighteen to twenty -five, in length once or 

 twice the diameter of the conceptacle, colorless, somewhat irregu- 

 larly divided and slightly nodulose at the tips ; sporangia ovate, 

 four to six, containing four to six spores. 



Leaves of Desmodium Canadense. Albany. September and 

 October. 



This plant generally occupies the upper surface of the leaf but 

 sometimes spreads to the lower. 



M1CROSPH.ERA EXTENSA C. (& P. 



Mycelium thin, effuse, persistent ; conceptacles globose, black ; 

 appendages eight to twelve, in length three or four times the 

 diameter of the conceptable, colorless ; sporangia four, subglobose 

 or ovate, containing four to six spores. 



Upper surface of oak leaves, Qaerciis rubra. Greenbush. Sep- 

 tember and October. 



It frequently occupies the whole upper surface of the leaf but I 

 have never seen it extend to the lower surface. It may readily be 

 distinguished by its habit and fewer differently shaped sporangia 

 from M. Vaccina which also has very long appendages. 



M1CROSPH.ERA HOLOSERICEA LeV. 



Leaves of Astragalus. Buffalo. Clinton. October. 



MicROSPH^RA Hedw^igii Lev. 



Leaves of Yiburnum Lentago. Albia, Rensselaer county. Sep- 

 tember and October. 



