1893.] NATURAL SCIENCES OF PHILADELPHIA. 141 



Perithecia lying in compact, circinate groups on the surface of the 

 inner bark or slightly buried in it, ovate-globose, black, membrana- 

 ceous, i mm. diam., necks converging with their obtuse smooth 

 ostiola in a small fascicle slightly raising and pierciag the thick 

 epidermis, but scarcely rising above it. Asci clavate-cylindrical, 

 75-80x8-10/-'-, pseudoparaphysate, 8-spored. Sporidia obliquely 

 uniseriate or subbiseriate, obovate, 2-celled, the lower cell very 

 small, the upper one much larger and elliptical, each with a single 

 nucleus, hyaline, 11-15 x 6-10//.. 



This has the habit of Diaporthe with the sporidia of Apiospora. 



Diaporthe ulmicola E. & E. 



On dead limbs of Ulmus, London, Canada. June, 1892. (Dear- 

 ness, No. 1,869.) 



Perithecia 8-12 in a pustule, globose, about i mm. diam. slate- 

 color inside, subcircinate, buried in the substance of the inner bark 

 which is unchanged except in being slightly blackened on the sur- 

 face. Ostiola cylindrical, about I mm. long, erect, straight, rising 

 in close fascicles through cracks in the rough outer bark, often, from 

 the close proximity of the pustules from which they rise, forming an 

 almost continuous series for a centimeter or more. Smooth or some- 

 what quadrisulcate at the apex. Asci (p. sp.) oblong-fusoid, about 

 40 x l;j., 8 spored. Sporidia biseriate, oblong-elliptical, 3-4-nucleate , 

 not at all or only slightly constricted in the middle, 8-11 x 3-4//. 



Diaporthe pruni E. & E. 



On dead limbs of Primus virginiana, London, Canada. April, 

 1892 (Dearness, No. 1,695.) and Iowa (Holway). 



Stroma cortical, orbicular or elliptical, convex, 3-4 mm. diam., 

 formed from the slightly altered and somewhat paler substance of 

 the bark. Perithecia 8-12, circinate, ovate-globose, i-i mm. diam., 

 black, finally subcollapsing, partly sunk in the surface of the wood, 

 contracted above into short necks with their hemispheric-conical 

 ostiola erumpent in a whitish disk which is soon obliterated. Asci 

 clavate-fusoid, 60-65 x 8-10//.. (p. sp.). Sporidia biseriate, oblong- 

 fusoid, hyaline, 4-nucleate, slightly constricted in the middle, with a 

 short, cornute appendage at each end, straight, 15-20 x 3h-5>j.. 



Differs from Cryptospora pennsylvanica, in its larger, appendiculate 

 sporidia. The stroma is mostly limited (in the bark) by a black, 

 circumscribing line which, however, does not (usually) penetrate the 

 wood. The appendages are mostly a little bent at the tips ; spores 

 with appendages 18-22// long. 



