528 Seaver : Some North Dakota Hypocreales 



Of the twenty species reported here one at least deserves espe- 

 cial mention. Nectria tiibtrciilariformis (Rehm) Winter was col- 

 lected in the autumn of 1907 on herbaceous stems and one speci- 

 men was found in full fruit on the bark of a dead branch. No 

 specimen of this species had previously been seen in the collection 

 of North American Hypocreales examined and up to the present 

 time no record of it from North America has been seen. During 

 the spring of 1908 a quantity of the material was collected on dead 

 stems of nettle, on which host the species has been reported in 

 Europe. The species, while a true stromatic Nectria, is specifi- 

 cally very distinct from any of the other forms of the genus that 

 have been examined. The stroma is tubercular, very distinct in 

 outline, and rounded or more often elongated. The perithecia are 

 small and instead of being cespitose on the stroma so as to cover 

 it almost completely, as is usually the case, they are entirely super- 

 ficial and distributed over its surface, being often scattered but 

 occasionally crowded. The species is of interest not only on ac- 

 count of its distribution but for its peculiar specific characters. 



The identification of the species recorded here has been facili- 

 tated by access to the collections of the New York Botanical 

 Garden, with its numerous types, as well as by the types that 

 have been received from individuals during the course of the work 



on the order. 



Synopsis of the grenera 



Perithecia free on the substratum, or entirely superficial on a sessile stroma. 

 Perithecia dark blue with transmitted light (nearly black to 



the naked eye), spores with 3 or more septa. I. GiBBERELLA. 



Perithecia normally bright colored, of some shade of red, 

 yellow, or brown (often becoming dark with age). 

 Spores 2-celled. II. Nectria. 



Spores muriform. III. Pleonectria 



Perithecia more or less immersed in a common matrix, varying 

 from a cottony subiculum to a distinct fleshy stroma. 

 Matrix consisting of a cottony subiculum in which the peri- 

 thecia are seated, usually growing on other fungi ; spores 

 fusiform. IV. Hypomyces. 



Matrix consisting of a distinct fleshy stroma, sessile or erect ; 

 spores filiform or subglobose. 

 Asci l6-spored (by the breaking of each spore into 

 two) ; spores subglobose ; stroma sessile (very rarely 



erect). V. HVPOCREA. 



Asci 8-spored ; spores filiform, nearly as long as the 

 ascus ; stroma erect (very rarely subsessile). 



