Seaver: The Hypocreales of North America 183 



1 6. Creonectria gen. nov. 

 Nectria Fries, Summa Veg. Scand. 387 (in part). 1849. 



Stroma fleshy or subfleshy, tubercular or depressed, red, yeilow, 

 brown, or occasionally black (at least with age) ; perithecia 

 globose or subglobose with the ostiolum often depressed with 

 age, smooth, verrucose or furfuraceous, superficial on or sur- 

 rounding the stroma; asci cylindrical, or clavate, 8-spored, with 

 the spores occasionally accompanied by numerous other minute 

 spore-like bodies in the ascus ; spores 1-2-seriate or irregularly 

 crowded, elliptical to fusoid, straight or curved, i-septate, hyaline; 

 paraphyses present or not evident. 



Type species : Tremella purpurea L. 



Distinguished from Nectria by the presence of a stroma. 

 Conidial phase represented by Tubercularia, V erticillium, etc. 



Perithecia some shade of red, scarlet, brick-red 

 or brownish-black. 

 Perithecia dull brick-red becoming brown or 

 black with age. 

 Ascospores not accompanied by spore-like 

 bodies in the ascus. 

 Perithecia verrucose, covered with 

 coarse granules. 

 Stroma tubercular, prominent. 

 Stroma concave, not rising above 

 the surface of the substratum. 

 Perithecia smooth or only minutely 

 rough, becoming black with age. 

 Ascospores accompanied by minute spore- 

 like bodies in the ascus. 

 Perithecia scarlet or blood-red, becoming red- 

 dish-purple with age. 

 Spores elliptical or subelliptical with ends 

 obtuse. 



Perithecia collapsing with age. 

 Becoming truncate. 

 Becoming pezizoid when 

 lapsed. 



Perithecia entire ; ostiolum 

 prominent. 

 Spores fusoid with ends acute or sub- 

 acute. 



Spores narrow-fusoid, 3 times as 



long as broad. 

 Spores broad-fusoid, 2 times as long 

 ■ . • as broad. 



col- 



very 



C. purpurea. 

 C. verrucosa. 

 C. atrofusca. 

 C. Coryli. 



5. C. pithoides. 



6. C. rubicarpa. 



7. C. mammoidea. 



8. C. coccinea. 



