Seaver: The Hypocreales of North America 193 



15. Creonectria tuberculariformis (Rehm) 

 Hypocrea tuberculariformis Rehm, Ber. Naturh. Ver. Augsburg 

 26: 106. 1881. 



Nectria tuberculariformis Winter; Rabenh. Krypt. Fl. I 2 : 118. 

 1887. 



Hypocreopsis tuberculariformis Sacc. Syll. Fung. 9: 981. 1891. 



Stroma tubercular, rounded or more often elongated, nearly 

 smooth or in dried specimens often longitudinally striated, pinkish 

 or rose-colored becoming dull red with age ; perithecia superficial, 

 solitary or more or less crowded, small, averaging about 200 mic. 

 in diameter, smooth or nearly so, globose with a rather promi- 

 nent papilliform ostiolum becoming slightly collapsed from above 

 when dry ; asci clavate, 8-spored, 40-50 X 6-7 mic. ; spores 1-2- 

 seriate, mostly 2-seriate above and 1 -seriate below, usually a little 

 broader above, fusoid, i-septate and a little constricted at the 

 septum, with small oil-drops in each cell, 8-1 1 X 3-4 mic. (pi. 

 1 3) f. 8-10). 



On dead stems of Urtica sp., more rarely on old branches and 

 dung. 



Type locality : Germany. 

 Distribution : N. Dakota. 



Specimens examined: N. Dakota, Seaver (various collec- 

 tions) ; also Rehm, Ascomycetes, 435, 679 (including cotype). 



The conidial phase of this fungus was collected commonly in 

 North Dakota but the mature perithecia were less common. The 

 species is very different in the arrangement of the perithecia from 

 any of the other species of the genus. 



Doubtful Species 

 Nectria muscivora (Berk. & Br.) Cooke, Handbk. Brit. Fungi 

 2:786. 1871. 



Sphaeria muscivora Berk. & Br. Ann. Mag. Nat. Hist. 6 : 188. 



185 1. Calonectria muscivora Sacc. Michelia 1 : 315. 1878. 



" Mycelium forming white, lanose patches 2 inches or more in 

 diameter and rapidly destroying the moss on which it grows. 

 Perithecia collected in little groups more or less connate, half 

 immersed in the mycelium, bright orange, ovate, sometimes col- 

 lapsing laterally, orifice papillaeform. Asci clavate ; sporidia 

 elliptical, pointed at either end, with a central septum, and the 

 endochrome in either articulation bipartite, so that they are prob- 

 ably three-septate when the sporidia are quite mature." 



