441 



aad constricted, 4-imcleate, 12-15 Js; 3 /z, witli 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 



D. tess^lla, (Pers.) 



Sphezria tesselia, Pets. Syn. p. 4B. 

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

 Cryptospora iessella, Karst. Myc. Fenn. II, p. ?H> 

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

 Diaporthe tesselia^ Relim Asc. 176. 



Stroma depressed-hemispherical, formed of the sca,rcely 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 /i. Sporidia 

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

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



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

 (Holway). Described from the Iowa specc. 



D. tessera, (Fr.) 



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

 Diaporthe tessera, Fckl. Symb. Nachtr, I, p. 31S. 

 F,xsicc. Fckl. F. Rh. 592.— Kne. F. Sel. tig.— Thum. M. U. i26t. 



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 //. Sporidia biseriate, 

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



-1 11. 



On dead limbs of CoryluH, New York (Peck), Iowa (Holway), on 

 Corylus rostrMa, California (Harkness). 



D. obsciira, (Pk.) 



Valsa obscura. Pk. 28th Rep. p. 73' 

 Diaporthe obscura, Sacc. SyU. 2429. 

 Exsicc. BIl. N. A. F. 877. 



56 



