442 GrIFFITITS : rVREXOMVCETES 



tion of the spores differs markedly also. In tlic European speci- 

 mens the spores are darker in color and the central band extends 

 over all of the two central cells, while in the American ones there 

 is a light streak between the dark band and the outside septa. 

 The paraphyses are much less abundant in the European species. 

 In both species the dark band obscures the middle septum so 

 that it is often difficult to determine whether the spores are really 

 3 -septate or not. I find, however, that after soaking in gl)xerine 

 for some time the central septum becomes more apparent. Its 



I 



presence is sometimes indicated by a very slight constriction • in 

 young spores it can be very distinctly seen. 



Dothidea conspicua .sp. nov. 



Stroma immersed, irrumpent, surrounded by the lacerated re- 



mains of the ruptured epidermis, circular or oval, seldom confluent, 



flat, rough, black, ^-7^ mm. in diameter: ascigerous cavities 

 sunken, oval to conical and more or less angular from mutual com- 

 pression, 50-60// X 100//: asci cylindrical-clavate, with a short, 

 stout, blunt stipe, without paraphyses, 65-85 ft x 12-14// : spores 

 sub-biseriate, unequally uniseptate, constricted, at first yellow, but 

 finally dark and opaque, 5-6// x 13-1S//. lY. j66. f. ip-2j. 



On Vnrra an^^-ustifolia at Billings, Mont., August, 1S98. 

 (Williams & Griffiths.) 



Mr. J. B. Ellis described a PhyllacJiora ? Yuccac on Yttcca 

 nngustifolia (Bull. Torr. Bot. Club, 22 : 440. 1895) collected by 

 Dr. Egeling at Matamoras, Mexico. I thought at first that my 

 specimen must be the fully developed condition of the immature 

 species which he there describes ; but the characteristics of the 

 stroma alone are enough to separate it from the Mexican speci- 

 men, which also appears to me to be a Dothidea. The absence 

 of paraphyses and the method in which the epidermis becomes 

 ruptured and lacerated are also good characteristics which would 

 separate the above described species from that described by 

 •. Ellis. The nearest relative, however, of this species appears 

 to be Dldyuiosphacria ynccacgcna (Cke.) Sacc, Sylloge Eungorum, 

 ■I : 708. This \\-as originally described as Sphacria yuccac gcna 

 Cooke, in Grevillea, 7:12. 1878, from specimens collected by Dr. 

 Harkness on Yucca covumods, at Sacramento, California. After 

 the change in name made by Saccardo, cited above, Cooke in 



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