l886.] NEW-YORK MICROSCOPICAL SOCIETY. 145 



because the tips of the appendages are uncinate, or furnished 

 with a little hook ; and of the species flexuosa, so named be- 

 cause about one-half of the appendage, next to the hook, is 

 flexuous, or wavy in outline, sometimes appearing to be twisted 

 in the form of an auger. 



This species is common in our section of the country on the 

 under surface of the leaves of the Horse-Chestnut tree. The 

 mycelium is so thin that it is not readily discernible. But the 

 conceptacles when mature can be seen, on close inspection, 

 without a lens, appearing as minute black specks, scattered on 

 the surface of the leaf. The conceptacles of this species have 

 from thirty to fifty appendages, are about .005 of an inch in 

 diameter, and contain about eight sporangia, while the sporangia 

 each contain eight spores. 



