20 



Seaver: North American Hypocreales 



In addition to the above, one species of Nectria was collected 

 and studied by the writer during the autumn of 1906 which it is 

 thought best to describe at this time. The plants occur on 

 partially decayed seeds of skunk-cabbage (Spathyema foetida) 

 and were collected commonly during the autumn of the above 

 date in a swampy place in the vicinity of New York City. The 

 conidial phase which forms a whitish or pinkish mass over the 

 surface of the decaying seeds, has much the gross appearance 

 of some of the common species of Fusarium but differs in its 

 microscopic details. The perithecia later appear in small clus- 

 ters seated on the stromata formed by the conidial phase of the 

 plant. During the past season, 1908, the locality in which this 

 species was originally collected was visited once, but at that time 

 none of the plants were found. 



Hyponectria Sacc. Michelia 1 : 250. 1878 



Perithecia globose or subglobose, subepidermal, often becoming 

 erumpent ; asci 8-spored ; spores elliptical or subelliptical, hya- 

 line, simple. Distinguished from Charonectria by the simple 

 spores. 



Type species: Hyponectria Buxi (DC.) Sacc. 



Spores 5-6 X 1.5-2 mic, on stems of Opuntia sp. 1. H. Cacti. 



Spores 10 X 2-2.5 mic., on herbaceous stems. 2. H. dakotensis. 



i. Hyponectria Cacti (Ellis & Everh.) 



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



Perithecia minute, scattered, subepidermal, globose or sub- 

 globose, expanded above the epidermis into a disc-like ostiolum, 

 perithecia red, with ostiolum lighter, whitish (in preserved speci- 

 mens), about 200 mic. in diameter; asci cylindrical to 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 sp. nov. 



Perithecia scattered or occasionally 2 or more in close con- 

 tact, subepidermal, becoming more or less erumpent, long, covered 



