306 



Spliiieria castorea, Tode. 



Siihaeria ooiyli, DC. 



Siihaeria gloincrata, DC. 



llypoxylou fuscuui, Fr. 

 Stroma erumpent, then superficial, generally 1-4 nnn. in diameter, 

 solitary or subconnate, depressed-pulvinate or liemispherieal, dark purplisli- 

 bi'own or purplish-red, finally almost black, somewhat uneven from the 

 slightly projecting, small (..5 mm.) perithecia which are closely packed, 

 irregularly monostichous, subglobose, with minute mammilliform ostiola. 

 Asci 95-110x7-8 microns, spore-bearing part 80-90x7-8 microns. Spores 

 10-12x5-6 microns. (E. & E.^ — Spores 11-14x5-6 microns.) (Saccardo. — 

 Spores 12-16x5-7 microns.) 



On dead Ulmus, Acer and Ostrya, vicinity of Bloomingtou, Indiana. 

 Also reported on Alnus, Betula, Coi^jlus, Fagus and otlier deciduous trees. 

 This species sometimes grows with a few of the perithecia in the 

 center of the stroma projecting farther than the remainder, forming a 

 kind of papilla and giving the entire stroma the appearance of a much 

 flattened volcanic cone. 



12. H. marginatum, (Schw.) Berk. 



Sphaeria mai'ginata, Schw. 



Sphaeria durissima, Schw. 



Sphaeria truncata, Schw. 



Hypoxylon durissimum, Cke. 



Hypoxylon marginatum. Berk. 

 Stroma pulvinate or hemispherical, 3 nmi. to 2 cm. across or by con 

 fluence more than that, ranging up to (t or 7 mm. in thickness ; black when 

 mature; surface slightly roughened iiy the projecting perithecia with their 

 ])apillil'<inii ostiola. I'eritliecln ovate, monostichous, peripherical, about 

 .5 nun. in diameter, with black ostiola which arise from the center of a 

 small, flat, circular disk or d(>i)ression which, however, does not appear in 

 the earlier stage of growth. .\sci 75-100x5-7 microns, spore-bearing part 

 55-75x5-7. Spores 7-9 x ;j.5-."i iiiici-oiis. (E. & E. — .\sci 75-sO x (i-7 mirnms. 

 Spores 7-0X.3-.3.5 microns.) 



()\\ hark and wood of (^Micinis, viiinity of I'.loomington. Indiana. 

 This species has the annulate-truncate perithecia similar to 11. anmil- 

 utum. but is distinguished from that s])ecies by its smaller and less prom- 

 inent peritlieciii. and by its larger stroma. (See under (U-scriiit ion of // 

 annulatum.) 



