cankerous stromata exposed. Since 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- 
GEONSE Mere tester secu crers he have tuts Mors ss atheists a Suesenoter a Sse. ore -l. WN. discreta. 
A. Stroma erumpent-superficial, either orbicular or elliptical; margin 
not so thick nor so regularly bulging as in the preceding species ; 
concave part + to 1 em. across. Spores subinequilateral, 10-15x5-G 
TMT CROMS trayeta <.co tate key eieteedia ome esceneraitie Clee le Ps Sa os .2. N.repanda. 
B. Stroma dull black, orbicular, elliptical, or broadly effused; ostiola 
rather prominently raised, 3-5 per linear mm. Spores 12-16x6-S 
TINT TOOT Shasey terre resem rcv ecter = (ota eers ae RIONeRe LS colo rdl'e! iors Soheteaveyeee 3. N. bulliardi. 
B. Stroma shiny black, more or less furrowed, staining the wood of the 
substratum orange color. Spores 12-16x5-7 microns. .4. . tinetor. 
IB. Stroma thin, orbicular, suborbicular or linear; ostiola depressed ; 
‘anging from 3 to 1 cm. across. Spores 43-5x2-23 microns........ 
Ait A per ee cise ONE CEP hee Se ACRE RRR eta ROR AC ERE ec 5. N. microplaca. 
DESCRIPTIONS. 
1. \Nummularia discreta, (Schw.) Tul. Plates I and II. 
Sphaeria discinola, Schw. Syn. Car. No. 63. 
Sphaeria discreta, Schw. Syn. N. Am. 1249. 
Sphaeria excavata, Schw. 1. ¢. 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; the concave surface at first white 
