The Fungus of the Hawthorn. 



159 



but on making search to ascertain if any other similar genus or species 

 of the order Mcidiacei existed on the hawthorn C. oxyacantha, or on 

 any of the numerous varieties of this hedge plant, with the view of 

 accounting for the discrepancy, I found, on turning up the leaves 

 having orange spots on their upper surface, true peridia (sacks) of 



Roestelia lacerata, Tul. ; Mcidium oxyacantha, Pers. Under a 

 power of about 90 diametei-s the general character of the peridia is 

 seen. They are densely aggregated, elongated, submersed, pale 

 brown, irregularly torn. The sporidia are copious ; thus far 



