306 



Sphaeria castorea, Tode. 



Sphaei'ia coi-yli, DC. 



Sphaeria glomerata, DC. 



Hypoxyloii fuscuui, Fr. 

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

 solitary or snbconnate, depressed-pulvinate or hemispherical, dark purplish- 

 brown 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 11-14 x 5-G microns.) (Saccardo. — 

 Spores 32-16x5-7 microns.) 



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

 Also reported on Alnus, Betula, Corylus, Fagus and other deciduous trees. 

 Tliis 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 nmch 

 fiattened volcanic cone. 



12. U. ynarginatum, (Schw.) Berk. 



Sphaeria marginata, Schw. 

 Sphaeria durissima, Schw. 

 Sphaeria truncata, Schw. 

 ITypoxylon durissimuni, Cke. 

 Hypoxylon marginatum. Berk. 

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

 fluence more than that, ranging up to 6 or 7 nnu. in thickness; black when 

 luattire; surface slightly roughened by the projecting perithecia with their 

 pniiilliform ostiola. I'erilhecia ovate, monostichous, peripherical, about 

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

 small, flat, circular disk or depression which, however, does not aitpear in 

 the earlier stage of growth. Asci 7.~)-100x5-7 microns, spore-bearing pari 

 ,'i5-75 X 5-7. Spores 7-9x3.5-,^) micrdus. (E. & E. — Asci 75-SO x n-7 microns. 

 Spores 7-9x8-8.5 microns.) 



On bark and wood of (Juercus, vicinity of Bloomington, Indiana. 

 This species has the annulate-truncate perithecia similar to //. annul- 

 ((turn, but is distinguished from that species by its smaller and less prom- 

 inent perithecia, and by its larger stroma. (See under description of // 

 annulatum.) 



