596 



tical, 4 mm. lung, depressed, adnate to the inner bark. Conceptacl 

 nearly free, thin, fragile, opake, black, attached to the epidermis so 

 that when this is torn away, the scutelliforni base remains. Stroma 

 pulveraceous, olivaceous, becoming dark brown. Perithecia larger 

 than in the allied species, few, aggregated, erect-convergent, ovate, 

 fragile. Disk erumpent. elliptical, minute, black. Ostiola obsoletely 

 prominent, scattered. Asci clavate, stipitate, polysporous. Sporidia 

 numerous, crowded, allantoid, yellowish, 5-7J [i long. 

 On bark of dead birch trees, Pennsylvania (Schw.). 



SUBORDER. DOTHIDEACE.E. 



Compound. Stroma pulvinate, effused or linear, coriaceous 

 subcarbonaceous, black. Perithecia reduced to mere cells, (generally 

 peripherical) in the substance of the stroma, and not separable from it, 

 papillate or simply perforated. Asci 4-8-spored. Sporidia hyaline, 

 yellowish or brown. 



PHYLLACHORA, Nitschke. 



in Fckl. Symb. p. 216. 



Stroma variable in shape, elliptical, oblong or lanceolate, covered 

 by the epidermis, black, more or less roughened by the apices of the 

 small, ascigerous cells, which are buried in the stroma, and often at 

 first contain spermatia. Sporidia ovate, elliptical or oblong, continu- 

 ous and mostly hyaline. Asci subcylindrical. 



* On dicotyledonous plants. 



Ph. Dalibardae, Pk. 27th Rep. p. 109, PI. I, figs 7-9. 



Stromata scattered, innate and subprominent on both sides of the 

 leaf, which is stained immediately around them reddish-brown, small, 

 less than | mm. diam., subtuberculose-roughened, black. Ascigerous 

 cells, 6-12 in a stroma, subglobose, 75-80 ju. diam. Asci oblong-fusoid, 

 50-60 x 10 fi. Sporidia crowded-biseriate, oblong-fusoid, hyaline, con- 

 tinuous, 12-16 x 3-3 1 p. 



On living leaves of Dalibarda rejiens, Forestburg, N. Y. 



Described from a specimen sent by Mr. Peck. 



Ph. Wittrockii, (Erikss.) 



Dothidea Wittrockii, Erikss. Fungi Seand. No. 40. 

 Phyllachora Wittrockii, Sacc. Syll. 5130. 



Stromata effused, surrounding 2 or 3 of the swollen, upper inter- 



