255 



3. R. mammiformis (Pers.) Ces. & De Not. 



Sphreria mammiformis Pers. 

 Hypoxylou mammseformge Berk. 

 Hypoxylon globulare (Bull.) Fekl. 

 Rosellinia mammiformis Sacc. 



Perithecia gregarious, crowded or confluent, globose, large, 1-1.5 mm. 

 in diameter, fragile, black and bare but not shining. Ostiolum abrupt, 

 palilliform. 



Asci (p sp.) 8-10x100-115 microns (E. & E). 



Spores 10-12x20-25 microns, oblong, elliptical, sometimes sligbtly 

 curved. E. & E. give sporidia 7-9 x 19-25 microns, without any 

 distinct apiculus. It can be easily dsitinguished from R. aquila by the 

 blacker, thinner walled and more fragile perithecia and the lack of a 

 decided subiculum. 



On bark of Acer, near Bloomington, Ind. 



4. R. gJandiformis E. & E. 



Perithecia scattered, the base sunk in the wood about one-fourth, 

 ovate-globose, roughened with glands, with a reinforcement around the 

 lower half similar to the cup of an acorn. This thickening is, however, 

 sometimes reduced to a mere granular coat. Ostiolum papilliform, small, 

 sometimes obsolete, the apex being evenly rounded. 



Asci not present in specimens at hand. E. & E. give (p sp.) 8-10 x 

 100-114 microns ; paraphyses abundant. Spores 7-10 x 13.75-17.5 microns. 

 E. & E. give 7-8 x 14-15 microns. Common on Loriodendron Juglans and 

 Fraxinus, Monroe County, Indiana. 



5. R. mutans (C. & P.) Sacc. 



Sphaeria mutans C. & P. 

 Rosellinia mutans Sacc. 



Perithecia more or less crowded or gregarious, rather small, about 

 .5-.75mm. in diameter, at first clothed with a thin, tawny, evanescent 

 tomentum, finally becoming smooth, black and shining; mostly globose 

 with a papillate ostiolum. In the specimen at hand the region about the 

 ostiola showed a distinct tendency to depress. 



Asci subcylindrical (p sp.) 6.5-7.5 x 80-92.5 microns. 



Spores uniserrate, elliptical, brown, 4.25-5.5 x 9-12.5. 



Common on decaying Juglans, near Bloomington, Indiana. 



