58' 



character as in the preceding species from which it differs in its smaller, 

 subolivaceous spores and smaller, striate perithecia with an apical 

 opening. 



On the basswood bottom and elm hoops of a barrel standing in a 

 cellar, Newfield, N. J., July, 1889. 



It is uncertain whether the perithecia in this genus ever become 

 aseigerous. v 



M. sparsum, Hark. Bull. Cal. Acad. Sei. Feb., 1884, p. 42. 



Perithecia scattered, yellowish-brown, 170-180 fi diaim, sur- 

 rounded by a scanty, white subiculum. Spores numerous, unequally 

 elliptical, hyaline, apiculate at each end, with a large vacuole, 7-9x6 p. 



On dead trunks of Acer macrophyllum, between the bark and 

 wood, Sunol, Cala. 



SUBORDER. HYPOCREACEJ]. 



Simple, or compound. Perithecia subearnose, or coi^iaceo-mem- 

 branaceous, never carbonaceous, bright-colored (red, yellow, blue etc.), 

 opening by a subcentral ostiolum. Stroma, when present, soft, waxy- 

 carnose, or occasionally cottony. Sacc. Syll. II, p. 447. 



The Hypocreaceoe form a very extensive and natural group, all 

 the different members composing it showing an unmistakable relation- 

 ship easily recognized. 



KEY TO THE GENERA. 



A. Perithecia sunk in the stroma. 

 * Stroma erect, sporidia filiform, hyaline. 

 ** Stroma effused, sporidia various, hyaline. 



1. Stroma capitate, sclerotigenous. 



" clavate, entomogenous. 

 u " herbicolous. 



2. Stroma tubercular, sporidia filiform, fimicolous. 



1. 



- 3. 



Claviceps. 



Cordyceps. 



Acrospermum. 



Selinia. 



3. 



Stroma suborbicular, flat. 

 " byssoid. 



Parasitic on other fungi. 



Growing on wood, bark etc. 



Sporidia filiform. 

 4. Stroma amplexicaul, sporidia filiform. 

 5.- Stroma valsoid. - 

 B. Perithecia superficial. 



herbicolous. Oomyces. 



Poly stigma. 

 - - Byssonectria. 

 Hypomyces. 

 Hypocrea. 

 Ifypocrella. 

 Epichloe. 

 Thyronectr'/a. 



