237 



cankerous stromata exposed. Siuce a great deal of damage is done before 

 the stromata are formed, it is necessary to identify the disease from other 

 characteristics. The remedy for this parasite is obviously the proper 

 treatment of wounds and the removal and destruction of affected parts. 

 Care in pruning would in many cases prove a sufficient preventive. 



This fungus has been reported on several other hosts including Ame- 

 lanchier but in these cases the economic importance is insignificant. 



KEY TO THE COMMON INDIANA SPECIES. 



I. Stroma cup-shaped with perithecia opening on the concave side. (A). 



II. Stroma convex or plane. (B). 



A. Stroma prominent, orbicular, with a thick, raised margin ; stroma 

 4 to 7 mm. across ; spores globose or subglobose, 10-16 mi- 

 crons 1. A. discreta. 



A. Stroma erumpent-superficial. either orbicular or elliptical : margin 



not so thick nor so regularly bulging as in the preceding species ; 

 concave part i to 1 cm. across. Spores subiuequilateral, 10-15x5-6 

 microns 2. A. repair da. 



B. Stroma dull black, orbicular, elliptical, or broadly effused; ostiola 



rather prominently raised, 3-5 per linear mm. Spores 12-16x6-8 



microns 3. A. bulliardi. 



B. Stroma shiny black, more or less furrowed, staining the wood of the 



substratum orange color. Spores 12-16x5-7 microns. .4. A. tinctor. 

 B. Stroma thin, orbicular, suborbicular or linear ; ostiola depressed ; 



ranging from i to 1 cm. across. Spores 4J-5x2-2^ microns 



5. A. microplaca. 



Desckiptioxs. 

 1. Kummularia discreta, (Schw.) Till. Plates I and II. 

 Sphaeria discinola. Schw. Syn. Car. No. 63. 

 Sphaeria discreta, Schw. Syn. N. Am. 1249. 

 Sphaeria excavata, Schw. 1. c. 1250 (Sec. spec, in herb. Schw.) 

 Nummularia discreta, Tul. Sel. Carp. II, p. 45. 



Stroma erumpent, circular or subcircular, sometimes uniting to form 

 elongated patches, cup-shaped when mature, with a thick raised margin; 

 ashen or grayish yellow, becoming black; tbe concave surface at first white 



