New North American Fungi. 



43 



Atkinson. No. 956. 4-8 mm. in height, the head 2-4 mm. in 

 diameter. A small species well distinguished by its globular head 

 continuous with the stipe. 



17. Peziza nigraxs. — Ascoma at first cupulate and orbicular, 

 becoming explanate and more or loss irregular, externally smoky- 

 pallid and glabrous, attached to the soil by slender fibers ; the 

 hymenium black. Asci cylindric, 8-sporous, the upper part contain- 

 ing the sporidia 60-70x10 mic. , shorter than the lower empty portion ; 

 paraphyses filiform, with clavate apices. Sporidia uniseriate, globose, 

 coarsely warted, smoky hyaline, 8 9 mic. in diameter. 



Growing on burnt soil; in autumn; Preston, Ohio Ascoma 

 1-2 cm. in extent, more or less irregular in outline. Belonging to 

 the genus Detonia of Saccardo's Sylloge ; closely akin to Peziza 

 trachycarpa, Currey. The dark granular coloring matter of the 

 hymenium closely cements the asci and paraphyses together; there 

 are 15 to 20 warts on the surface of each sporidium. 



18. Scleroderris rubra. — Ascomata gregarious erumpent, 

 becoming superficial and cupulate, coriaceous, the outer surface 

 brown and furfuraceous ; the hymenium red, changing to brown with 

 age. Asci cylindric, 8-sporous, 130 150x12-15 mic, the stalk very 

 short; paraphyses abundant, filiform, overtopping the asci. Sporidia 

 obliquely uniseriate, oblong, brown, 3-septate, constricted at the 

 septa, the cells nucleate, 20-30x8-10 mic. 



Growing on dead branches of Asimina triloba. Ascoma 2-3 mm. 

 in extent when fully developed. The apices of the paraphyses are 

 glued together by a red granulose coloring matter to form the surface 

 of the hymenium. The Scleroderris is accompanied on the same 

 branches by a Cenangium with oblong hyaline continuous sporidia of 

 about the same size. 



19. Triposporium i:icorne. — Hyphai slender, creeping, 

 septate, brown, sending up here and there fertile branches, which 

 bear at the apex a single spore. Sporophore ascending or erect, vari- 

 able in length and not so thick as the spore, with a few distant septa. 

 Spore consisting of a short basal segment with two widely divergent 

 branches, one branch 4-6 septate and 40-60 mic. in length ; the other 

 5-7 septate and 70-75 mic. in length; the base of the spore 8-10 mic. 

 in diameter, each branch at the lower septum n-14 mic. in thickness 

 and tapering gradually to a blunt point. 



