441 



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

 at each end. 



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

 Mr. Langlois. 



Cooke, in Yalsei U. S. p. 121, makes this a Syn. of V. Mleola, Fr., 

 but we find it very different 



v 



D. tessella, (Pers.) 



Sptuena tessella, Pers. Syn. 'p. 4 



J^alsa tessella, Fr. Summa Veg. Sc. p. 411. 

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



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

 Diaportke tessella, Rehm A.SC. 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 circte 23 mm. 

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

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

 penetrated by any circumscribing line. Ostiola separately erurupent. 

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

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

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

 slender appendage at each end, 4^--V2 x 7-8 jj.. 



On dead willow limbs. Carolina and Pennsylvania (Schw.). Iowa 

 (Holway), Described from the Iowa specc. 



D. tessera, (Fr.) 



SpheSrta tessera, Fr. S. M. II, p. 405. 

 Diaporthe tessera, Fckl. Symb. Nachtr. I, p. 318. 

 Exsicc. Fckl. F. Rh. 592. Ke. F. Sel. 119. Thum. M. U. 1261. 



Perithecia 3-10 together, subcircinate. buried in the unchanged 

 substance of the inner bark which is raised into indistinct pustule? 

 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, 60-70 x 10-12 p. Sporidia biseriate, 

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



-IP. 



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

 Qorylus rostrata, California (Harknessi. 



D. obsciira, (Pk.) 



Valsa obscura, Pk. 2Sth Rep. p. 73. 

 Diaporthe obscura, Sacc. S\ - ll. 2420. 

 Exsicc. EH. N. A. F. 877, 



56 



