Seaver: Hypocreales of North America 45 



I. Hyponectria Cacti (Ellis & Everh.) Seaver, 

 Mycologia i • 20. 1909 



Nectriella Cacti Ellis & Everh. Jour. Myc. 8 : 66. 1902. 



Perithecia minute, scattered, subepidermal, globose or subglo- 

 bose, expanded above the epidermis into a disc-like ostiolum ; peri- 

 thecia red, with the ostiolum lighter, whitish (in preserved speci- 

 mens), about 200 mic. in diameter; asci cylindrical or clavate, 

 8-spored, 40-50 X 3-4 mic. ; spores 2-seriate, simple, hyaline, 

 straight or curved, 5-6 X 1-5-2 mic. 



On stems of Opuntia sp. 



Type locality: Alabama. 



Distribution : Known only from type locality. 



Specimens examined: Alabama, Carver 584 (type). 



2. Hyponectria dakotensis Seaver, 

 Mycologia 1 : 20. 1909 



Perithecia scattered or occasionally 2 or more in close contact, 

 subepidermal, becoming more or less erumpent, long covered by 

 the thin, whitish epidermis of the host, scattered over whitish 

 patches on the substratum but with no apparent superficial my- 

 celial growth; ostiolum forming a disc-like expansion above the 

 surface of the epidermis with a distinct perforation in the 

 center, slightly hairy, especially near the margin of the disc 

 where the hairs appear as a delicate fringe ; perithecia 200 mic. 

 in diameter ; asci clavate, 8-spored, 30-45 X 5 mic. ; spores mostly 

 2-seriate above, often i-seriate below, fusoid, with usually 2 

 large oil-drops, and 1-2 smaller ones toward either end, 10 X 

 2-2.5 mic; paraphyses present, delicate (pi. 4. f. 5). 



On herbaceous stems (Ambrosia trifida?). 



Type locality : Fargo, N. Dakota. 



Distribution : Known only from type locality. 



Illustrations : Mycologia 1 : pi. 2. f. 1-4. 



2. Nectriella Fuckel, S^mb. Myc. 175. 1869 



Char one ctria Sacc. Michelia 2 : 72. 1880. 



Perithecia globose or subglobose, entirely subepidermal or 

 erumpent-superficial ; asci 8-spored; spores hyaline, 1 -septate. 



Type species : Nectriella Fuckelii Nitsch. 



Distinguished from Hyponectria by the compound spores. 



Perithecia large, 400 mic. in diameter, pale red. 

 Perithecia small, 175-200 mic. in diameter, scarlet. 



1. N. Pedicularis. 



2. N. peponum. 



