ENDOTHIA PARASITICA AND RELATED SPECIES. 19 



graph, Plate XVII, fig. 9, shows an ascospore which agrees with 

 Petri's description and figures. 



ENDOTHIA FLUENS MISSISSIPPIENSIS S. and S. nov. comb. 



SYNONYM : 



Endothia radicalis mississippiensis Shear and Stevens in U. S. Dept. Agr., 

 Bur. Plant Indus. Cir. 131, p. 4. 1913. 



TYPE SPECIMEN. No. 1782, on Castanea dentata, Blue Mountain, Miss., N. E. 

 Stevens, Feb. 13, 1913. Deposited in Pathological and Mycological Collec- 

 tions, Bureau of Plant Industry. 



CULTURAL CHAKACTEHS. Cultures one month old on white corn meal show a 

 compact, rather uniform surface, the color of the mycelium varying from cad- 

 mium orange to xanthine orange. This variety is distinguished from the species 

 by the color of its mycelium, by the numerous small pycnidia thickly scattered 

 over the surface of the culture, and by the lack of any purple color in the 

 medium. 



HOSTS. Castanea dentata, Quercus alba, and Q. velutina. 



GEOGKAPHICAL DISTRIBUTION. Northern Mississippi, Kentucky, Tennessee. 



COLLECTIONS EXAMINED. On Castanea dentata: No. 1706 A. pycnidia, Corinth, 

 Miss., T. E. Snyder; no. 708, pycnidia, Dumas, Miss., T. E. S. ; no. 1782, 

 ascospores, Blue Mountain, Miss., N. E. S. ; no. 1806, ascospores, Blue Moun- 

 tain, Miss., N. E. S. On Quercus : No. 1989, pycnidia, Danville, Ky., N. E. S. ; 

 no. 1995, pycnidia, Danville, Ky., N. E. S. ; no. 2032, pycnidia, Lexington, Tenn., 

 N. E. S. ; no. 2255, pycnidia, Sardis, Miss., S. and S. 



No morphological characters have yet been found to distinguish this variety. 

 It is therefore separated on its cultural characters, which are marked and 

 constant. The plant was first collected by T. E. Snyder, of the Bureau of Ento- 

 mology. 



ENDOTHIA LONGIROSTRIS Earle, 1900, in Muhlenbergia, v. I, no. 1, p. 14. 



SYNONYM : 



Perithecia : Diatrypc radicalis ( Schw. ) Fries, Mont., 1855, in Ann. Sci. Nat. 

 Bot. 4, t. 3, p. 123. Not Schw. 



TYPE SPECIMEN. No. 4340. A. A. Heller, Plants of Porto Rico. In Herb. 

 N. Y. Bot. Garden. 



PYCNIDIA. : Stromata corticular, erumpent, gregarious, sometimes confluent, 

 1 to 3 mm. in diameter, subcoriaceous, surface orange rufous to chestnut, in- 

 terior zinc orange ; pycnidia consisting of irregular labyrinthiform cavities open- 

 ing by a single large pore or irregular rupture at the apex of the stroma ; 

 sporophores slender, somewhat tapering upward, mostly 8 to 10 p long; pycno- 

 spores oblong elliptic, hyaline or yellowish in mass, when expelled forming a 

 stout spore horn or tendril, colored like the stroma on the outside, 2 to 4 

 by 1 to 1.5 p. 



PEEITHECIA. Stromata the same as those producing pycnidia, but larger and 

 frequently confluent, forming linear series in crevices in the bark; perithecia 

 arising usually at the base of the pycnidial stroma, mostly 3 to 10 in the sepa- 

 rate stromata, membranous, 300 to 400 p in diameter, mostly in a single irregu- 

 lar series, prolonged into long necks, 1.5 to nearly 1 cm. long, sec. Earle, inter- 

 nally black, externally same color and structure as the stroma; ostiole acute; 

 asci oblong cylindric to fusiform, 25 to 35 by 5 to 7 p, mostly 30 by 6 p ; asco- 

 spores overlapping uniseriate to irregularly biseriate, hyaline, ovoid to ovoid 

 elliptical, 6 to 8.5 by 3 to 4 p, mostly 7 to 7.5 by 3 to 3.5 p. 



