238 



punctate from the minute ostiola which are hardly visible wheu mature. 

 The bark and wood beneath the stromata are marked with a black circum- 

 scribing line. Perithecia arranged in a single row, oval or ovate-cylindrical, 

 about one millimeter long, usually rather abruptly contracted above into a 

 short neck and extending to the base of the stroma. Asci cylindrical, 140- 

 170x10-15 microns (E. & E., 110-120x10-12) ; spore bearing part. 110-125x 

 10-15 microns. Paraphyses, long and filiform. Sporidia subglobose, almost 

 hyaline at first, finally becoming opaque, 10-16 microns in diameter. (11-13 

 Gloyer. 10-12 E. & E.) 



On dead trunks and branches of Pyrus mains : quite common on the 

 living trees as well. Practically every orchard visited in Hendricks, Put- 

 nam and Monroe counties, Indiana, as well as Delaware County, Ohio, 

 showed traces of this fungus. Gloyer reports it especially abundant in 

 southern Ohio. Reported on Amelanchier canadensis. Newfield. N. J., and 

 on Gleditschia triacanthos. Ohio. (Morgan) ; also (See Saccardo in Syll.1 

 on Sorbus, Ulmus. Cercis and Magnolia. 



I >n apple trees this fungus usually attacks the trunks and larger 

 limbs, making somewhat sunken, cankerous areas several inches in length. 

 The dead bark is separated from the sound by a distinct line and cracks 

 occur along this boundary. At the beginning, living spots within the cank- 

 erous area give the affected parts a mottled appearance. This distinguishes 

 it at this stage from other cankers. 



2. , Nummularia repanda. (Fr.) Nke. 



Sphaeria repanda. Fr. S. M. II, p. 346, Obs. Mycol. I, p. 16S. 

 Hypoxylon repandum. Fr. Summa Veg. Sc. p. 383. 

 Nummularia pezizoides, E. & E. Bull. Torr. Club, XI, p. 74. 

 Nummularia repanda, Nitsch. Pyr. Germ. p. 57. 

 Exsic. Fckl. F. Rh. 2178. Thum. M. U. 1460. 



Stroma erumpent-superficial, orbicular or subelliptical, i to 1 cm. in di- 

 ameter, concave and often with a thin, erect, rather broad margin, reddish- 

 gray at first, finally black: disk mammillose from the projecting ostiola. 

 Peritheia monostichous. immersed, ovate-oblong, i to i mm. long, crowded, 

 causing the sides to be somewhat compressed. Asci cylindrical, subsessile. 

 eight-spored. 110-120x8 microns, with long filiform paraphyses. Sporidia 

 obliquely uniseriate. narrow ovate, obtuse, subinequilateral. dark brown, 

 81-14x4-7* microns. (E. & E. 11-14x4-5 microns: Sacc. in Syll., 15-16x6-7 

 microns. ) Readily distinguished from X. discreta by its differently shaped 

 spores and its mammillose disk. 



