NOTES ON NORTH AMERICAN HYPO- 

 CREALES— I. NEW AND NOTE- 

 WORTHY SPECIES 



Fred J. Seaver 



The genus Hyponectria, founded by Saccardo in 1878, differs 

 from Nectriella in the subepidermal character of the perithecia. 

 Six species have been referred by Saccardo to this genus, in 

 various volumes of his Sylloge Fungorum, one of which, Hypo- 

 nectria Gossypii (Schw.) Sacc, the only North American repre- 

 sentative of the genus, has since been shown not to be a fungus 

 at all.* This leaves the genus, at present, entirely unrepre- 

 sented in North America so far as the records show. 



In working over the material in the Ellis collection at the 

 New York Botanical Garden, one species, Nectriella Cacti Ellis 

 & Everh., has been found to show the true hypodermal char- 

 acter of the perithecia and should be referred to this genus. 

 The ostiola form disc-like expansions above the surface of the 

 epidermis but the perithecia themselves, while prominent, are cov- 

 ered by the thin epidermis of the host, a fact which was not 

 mentioned by Mr. Ellis in his original description and one which 

 apparently escaped his notice. 



One species of this genus has also been collected by the 

 writer in North Dakota on dead stems of herbaceous plants. 

 As in the preceding, the perithecia of this species are prominent, 

 though covered, forming minute, orange pustules scattered over 

 the surface of the host. The ostiola also form the disc-like, 

 slightly hairy expansions above the surface of the epidermis. 

 This form is distinct in its spore characters from the preceding 

 as well as from any of the species which have been previously 

 described as representative of this small genus and is here 

 offered as new, being now one of the two representatives of the 

 genus for North America. 



* U. S. Dept. Agric. Div. Veg. Phys. Path. Bull. 17: 51. 1899. 



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