441 



and constricted, 4-nucleate, 12-15x3 ft, with a bristle-like appendage 

 at each end. 



On dead oak limbs, New York. Sent also from Louisiana by 

 Mr. Langlois. 



Cooke, in Valsei U. S. p. 121, makes this a Syn. of V. taleola, Fr., 

 but we find it very different. 



1). tessella, (Pers.) 



Sphceria tessella, Pers. Syn. p. 48. 

 Valsa tessella, Fr. Summa Veg. Sc. p. 411. 

 Cryptospora tessella, Karst. Myc. Fenn. II, p. 78. 

 Valsa mucronata, Pk. 28th Rep. p. 74. 

 Diaporthe tessella, Rehm Asc. 176. 



Stroma depressed-hemispherical, formed of the scarcely altered 

 substance of the bark, but surrounded by a black, enveloping crust 

 visible through the epidermis as a small, grayish-black circle 2-3 mm. 

 diam. Perithecia few (4-6), deeply bedded in the stroma, sunk to 

 the subjacent wood which is slightly blackened on the surface, but not 

 penetrated by any circumscribing line. Ostiola separately erumpent, 

 but not projecting, perforated and often umbilicate. Asci oblong- 

 fusoid, attenuated at each end, stipitate, 100-130 x 18-22 //, Sporidia 

 mostly biseriate, oblong-cylindrical, slightly curved, with a short, 

 slender appendage at each end, 48-52 x 7-8 ju. 



On dead Avillow limbs, Carolina and Pennsylvania (Schw.), Iowa 

 (Holway). Described from the Iowa specc. 



D. tessera, (Pr.) 



Sphceria tessera, Fr.' S. M. tl, p. 405. 

 Diaporthe tessera, Fckl. Symb. Nach.tr. I, p. 318. 

 Rxsicc. Fckl. F. Rh. 592. Kze. F. Sel. 119. Thura. M. U. 1261. 



Perithecia 3-10 together, subcircinate, buried in the Unchanged 

 substance of the inner bark which is raised into indistinct pustules 

 a little paler in the center and barely pierced by the minute, black 

 ostiola. The groups of perithecia are very numerous and lie close to- 

 gether almost entirely filling the bark, but there is no discoloration. 

 Asci oblong-fusoid, 8-spored, 60-70x10-12 /jl. Sporidia biseriate, 

 oblong-fusoid, uniseptate and constricted (finally 3-septate), 15-22 x 5 

 -7 fi. 



On dead limbs of Coryhis, New York (Peck), Iowa (Hoi way), on 

 {Jovylas rostrata, California (Harkness). 



D. obsciira, (Pk.) 



Valsa obsciira, Pk. 28th Rep. p. 73. 

 Diaporthe obscura, Sacc. Syll. 242s. 

 Fxsicc. F,ll. N. A. F. 877. 



56 



