423 



The members of this family grow in the bark or decorticated 

 wood of dead limbs or on dead herbaceous stems. 



DIAPORTHE, Nitschke. 



Pyr. Germ. p. 240. 



Stromata cortical, subvalsoid, separate (Chorostate), or effused, 

 indeterminate, formed from the slightly altered substance of the bark 

 and usually limited by a black line (Tetrastaga), or evenly effused, 

 but with the surface of the matrix finally blackened, its substance 

 otherwise unchanged, only in most cases limited by a black, circum- 

 scribing line visible on a horizontal section (Euporthe). Perithecia 

 membranaceous or subcoriaceous, generally pale cinereous within, 

 with a cylindrical or filiform exserted beak. Asci typically apar- 

 aphysate, fusoid, 8-spored. Sporidia fusoid or subelliptical, unisep- 

 tate,* generally constricted in the middle, 2-4-nucleate, hyaline, with 

 or without appendages. The spermogonial stage is represented by 

 species of Phoma. 



A. Stroma valsoid; perithecia subcircinate; ostiola fasciculate. 



{Chorostate). 



* Sporidia not appendiculate. 

 D. oncostoma, (Duby). 



Sphceria oncostoma, Duby in Rab. Herb. Mycol. No. 205. 

 Valsa personata, C. & E. Grew VI, p. 9. 

 Diaporthe oncostoma, Fckl. Symb. p. 205. 

 Sphcrria enteroleuca, Fr. Schw. Syn. N. Am. 1314? 

 Exsiec. Fckl. F. Rh. 1730 Rab. 1. c. Ell. & Evrht. N. A. F. 2d Ser. 1952. Thum. M. 

 U. 1855. Kze. F. Sel. 582. Sydow. M. March. 551. Roum. F. G. 2391. 



Stromata scattered, globose-conical, innate-erumpent, with a black, 

 circumscribing line which penetrates the wood. Perithecia subcircin- 

 ate, globose, |-1 mm. diam., penetrating to the wood or partly im- 

 mersed in it. Ostiola elongated, subconvergent, cylindrical or irregu- 

 lar, erumpent in a rather compact tuft. Asci oblong-clavate, p. sp. 45- 

 50 x 8-9 ft. Sporidia biseriate, oblong- fusoid, 12-16 x 3-3J p, unisep- 

 tate and finally slightly constricted. 



On dead branches of Robinia pseudacacia, Newfield, K. J. 



Cke. in Grev. makes the sporidia 25-28x6 fi. We find them as 

 above stated. 



*Often each of the cells is divided by a faint septum but without any constriction, the di- 

 vision being only a separation of the cell contents and not a true septum. 



