451 



On dead stems of Lappa major, New Jersey, and on Ambrosia 

 trifida, Louisiana, on wild parsnip, California (Harkness). Found in 

 Europe also on Cirsmm, Tanacetum, and other species of Compositce. 



This is with difBculty distinguished from D. orihoceras, but differs 

 from that species in its rather acute, subinequilateral or slightly curved 

 sporidia. Winter and Saccardo give the sporidia as 10-14 /u long. 

 We find the Ameiican specc. of D. orthoceras to have the sporidia 

 mostly shorter than in D. Arctii, about 8-10 /z, 



D. adnnca, (Desm.) 



SphcErza adu-nca, Rob. & Desm. XIX. Not. p. 14. 

 Diaporthe adnnca^ Sacc. Syll. 2514. 

 Exsicc. Desm. PI. Crypt. Kd. I, 2071.— Kunze F. Sel. 134. 



Perithecia buried, with the apex slightly pustuliform-prominent, 

 small (150-200 /.<), often slightly elongated, scattered or sometimes 

 two lying close together. Ostiola short-cylindrical, exserted, 150-200 

 X 75-80 ji, Asci oblong-clavate, sessile, 35-40 x 6-7 /«, aparaphj^ate. 

 Sporidia biseriate, oblong-fusoid, mostly straight, uniseptate, but not 

 constricted, 12-15 x3-4 p., ends subacute, hyaline. 



On dead scapes of Plantago lanceolata, Newfield, N. J. 



The part of the scape occupied by the fungus, soon becomes uni- 

 formly blackened on the surface, but is not discolored within. The 

 foregoing diagnosis is drawn from the specc. in Desm. Exsicc, the 

 Newfield specc. not being well matured. 



D. placoides, E. & E. (in Herb.) 



Stromata elliptical, 1-3 x 1 mm. diam., or about that, black on the 

 surface, white within, but limited by a distinct black line, gregarious, 

 at first covered by the epidermis and not prominent, but when the 

 epidermis falls away, standing out like little black, elliptical shields or 

 disks. Perithecia often only one or two in a stroma, very small, 100- 

 150 p. diam., buried in the surface of the stroma, with the papilliform 

 or conic-papilliform ostiola projecting. Asci oblong-fusoid, 35-40 x 

 6 /i, 8-spored, aparaphysate, Sporidia biseriate, nai;row-elliptical, 

 3-4-nucleate, hyaline, not constricted, 7-8 x ^ p.. 



On decaying stems of Lactuca Cariadensis, Newfield, N. J. 



The stromata, especially near the base of the stem, are sometimes 

 confluent. Outwardly there is a strong resemblance between this and 

 D. Gladioli. 



D. orthoceras, (Pr.) 



Spharia orthoceras, Fr. Elench. II, p. 97. 

 Diaporthe orthoceras. Nits. Pyr. Germ. p. 270. 

 Exsicc. Fckl. F. Rh. 897.— Kze. F, Sel. 130, 131, 132, 353.— Rehm Asc. 331, 523.— Rab. F. E. 

 534.— Thum, M. U. 974. 



