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1. R. aquila (Fr.) De Not. 



Sphan-ia aquila Fi". 

 Sphseria byssiseda Meckl. 

 Rosellinia aquila De Not. 



Perithecia large, globose. 1-1.25 mm. in diameter, gregarious, crowded 

 or sometimes confluent, with a distinct black, conic-papilliform ostiolum : 

 dark brown at first with a thin tomentose coating, finally becoming bare. 

 Subiculurn rather thick and prominent, dark to purplish brown, nearly en- 

 veloping the perithecia at first but finally disappearing to a greater or less 

 extent. Outer walls of the perithecia thick, brittle and carbonaceous. 

 Inner wall coriaceous. Asci long, cylindrical (p sp.) 10-12.5 x 165-190 mi- 

 crons. Spores uniserrate, oblong, brown. 10-11x22.5-27.5 microns. (E & E) 

 gives asci (p sp.) 8-10 x 100-130 microns. Sporidia 6-9x16-27 microns, 

 with or without a short, obtuse, hyaline apiculus. 2-2.5 microns long at 

 each end. 



Common on decaying and fallen limbs, near Bloomington. Ind. Speci- 

 mens at hand are on Fagus, Acer, Quercus and Juglans. 



2. R. medullaris (Walls) Ces. & De Not. 



Sphaeria medullaris Walls. 



Rosellinia medullaris Oes. & De Not. 



Rosellinia macouniana E. & E. 



Perithecia more or less erumpent. large 1-1.5 mm. in diameter, ovate 

 to sub-globose, covered at first with a pruinose-pubescent coat of a dull 

 red or brick color, becoming black with age ; loosely adnate, apex con- 

 vex to conic-papilliform. surface dirty-roughened with a finely powdered 

 sooty covering ; very fragile. Wall double and intermediate in thickness 

 between R. aquila and R. thelena. Subiculum slight. 



Spores 7.5-12x20-25 microns. E. & E. give asci (p sp.) 7-8x100-120 

 microns. Sporidia 6-7 x 19-20 microns; ovoid, somewhat acute, brown, 

 broader but not pointed as in R. mammiformis. 



On Cercis canadensis and Juglans, Monroe County, Ind. 



On examining a great number of perithecia the most of them were 

 found to contain a white, granular mass such as described in R. medul- 

 laris by Saccardo, but close observation showed this material to be a fine 

 powder of wood that had been brought into the perithecia from the bottom 

 by a small larva that probably feeds upon the contents of the perithecia. 



