204 



Mycologia 



Pseudovalia xanthoxyli Sacc. Syll. Fung. 2: 137. 1883. 

 Fenestella Xanthoxyli Sacc. Syll. Fung. 2 : 332. 1883. 

 Pleonectria pyrrhochlora Winter; Rabenh. Krypt. Fl. i 2 : 108. 

 1887. 



Thyronectria virens Hark. ; Ellis & Everh. N. Am. Pyrenom. 92. 

 1892. 



Thyronectria Xanthoxyli Ellis & Everh. N. Am. Pyrenom. 92. 

 1892. 



Perithecia cespitose in rounded or elongated clusters, seated on 

 the inner bark, finally bursting through the epidermis, becoming 

 more or less superficial, often so densely cespitose that the peri- 

 thecia appear to be united, at first covered with a thin olive-green 

 tomentum, or powdery material, with the ostiolum protruding and 

 bare, the entire perithecium becoming more or less bare with age, 

 about 300 mic. in diameter; asci clavate, 100-125 mic. long, 8- 

 spored ; spores crowded, elliptical, straight or curved, hyaline or 

 slightly yellowish, many-septate and muriform, 18-24 X 7~8 mic. 



On branches of Acer, Fraxinus and Xanthoxylum. 



Type locality: Europe. 



Distribution : New York to Ontario and Ohio. 

 Exsiccati: Ellis & Everh. N. Am. Fungi, 2546, 3310. Other 

 specimens examined : Ohio, Morgan; Ontario, Dearness 1484. 



2. Thyronectria denigrata (Winter) 

 Pleonectria denigrata Winter, Bull. Torrey Club 10: 49. 1883. 



Perithecia erumpent in very dense, large, rounded clusters 2-5 

 mm. in diameter, seated on a brownish stroma; individual peri- 

 thecia nearly globose, minutely roughened, dark brownish with 

 a prominent, black, shining ostiolum finally becoming black, 350- 

 450 mic. in diameter ; asci cylindrical, 50-70 X 8-10 mic, 8- 

 spored ; spores i-seriate or crowded, short elliptical, hyaline or 

 slightly yellowish, 3-5-septate, becoming muriform, often a little 

 constricted, 10-15 X 7~9 mic. 



On branches of Gleditschia triacanthos. 



Type locality: Lexington, Kentucky. 



Distribution : Delaware to Kansas and Kentucky. 



Exsiccati : Ellis, N. Am. Fungi, 1334; Ellis & Everh. N. Am. 

 Fungi, 23J2. Other specimens examined: Delaware, Commons; 

 Kansas, Bartholomew ; Kentucky, Kellerman; Missouri, Webber; 

 Ohio, Morgan. 



