Grifi riHS : Pvrexomvcetes 439 



Perlsporium vulgare Cda. 



Perithecia superficial, scattered or gregarious and more or less 

 angular from mutual compression, subglobosc, carbonaceous, brit- 

 tle, black and' shining when mature, covered at first with a white 

 tomentum which soon disappears, about ^ mm. in diameter : 

 asci evanescent, broadly clavate, long-stipitate, 8-spored, 15- 



20 //x 90- 1 05 // : spores 4-cclled, 6-8 ax 24-28//, brown, opaque, 

 with the two end cells subconical and the two middle ones 



i 



oblong-cubical, easily separating into separate cells. ' /Y. j66. 



f. 13-1S. 



This specfes is described and figured here for several reasons 

 So far as I am aware, it has not been recorded before from this 

 country, although figured and described by Messrs. Ellis & Ever- 

 hart from European specimens. The specimens, which I have hi 

 good quantity, were collected by Mr. C. W. Williams, one of my 

 former students, at Aberdeen, S. D., on sticks and straw in an old 

 rubbish heap, March, 1898. 



The ascospores germinate very readily and grow vigorously. 

 The specimens from which the accompanying figures were made 

 were cultivated from the ascospores of the material cited above. 

 Ordinary filter paper was sterilized, placed in a Petri dish and 

 moistened with a sterile decoction of ash leaves, and then inocu- 

 lated with the ascospores. A delicate white mycelium was pro- 

 duced in abundance in a very icw days, but careful search failed 

 to discov^er any conidia. The perithecia became mature in six 

 weeks. The spores (cells of ascospores) apparently have no 

 regular method of germination, like those of the Sordariaccac or 

 CJiactouiiaccac for instance, but crack open irregularly to aljow the 

 promycelium to develop. Although the conditions were apparently 



, w 



favorable for mycelial development the j^erithecia were few and 

 scattering in my cultures. 



Pocosphaeria Allii sp. nov. 



Conidial hyphac arising from a much branched torulous, 

 knotted, brown, subepidermal mycelium, variously bent and 

 knotted, 6-8/1 x 150-200/^: conidia oval, 1-3-septate, brown, 

 minutely echinulate, 11-14/^ x 24-30//: perithecia subglobose 

 to hemispherical, 100-125 // in diameter, erumpent, membranous, 

 dark-colored with a thickened darker ring around the ostiolum ; 

 bristles around the thickened ostiolum black, smooth, straight to 



