566 



On dead linilis of various deciduous trees, common. 



AVe do not find tlie spnridia in any Amci'ican specc. over 9 // long, 

 mostlv not over 7 //. Spore, in Cooke's Fun in Brit, liave sporidia 

 8 11x1 i-2 //: in IMim Asc., 6-8 x 1 J-2 //.. 



Di<iti'(/pe Deui'itcxxii. R A' H., is almost exactly the form repre- 

 sented in Rolim Ase. '220 //.with conical, 4-sulcate ostiola ; Z). tennis- 

 xiiiHi, Cke., is a thin form, but cannot be specifically distinct. The 

 ostiola vary from flat-discoid, orbicular, as in Rehm Asc. 220 6, to 

 conical and sulcate, R. Asc. 220 a: between these two extremes are 

 various gradations. The specc. in. Ell. N. A. F. 491, which are the 

 same as in Rav. F. Am. 359, were issued by Dr. Winter (F. E. 2954) 

 as I), platystoma, (Schw.). but that is a coarser species with larger 

 perithecia and ostiola, and a thicker (1 mm.) stroma. In all the 

 American specc. of D. stigma, the stroma is mostly about | mm. thick. 



D. bullata, (Hoff.) 



Spheeria bullata, Hoff. Veg. Crypt. I, p. 5, tab. II, fig. 3. 

 Spheeria depressa, Bolt. Fungi Halif. Ill, tab. 122, fig. i. 

 Sph&ria placenta, Tode Fungi Meckl. II, p. 26. 

 Diatrype bullata, Fr. Summa, p. 385. 



Exsicc. Fckl. F. Rh. 1042. Rab. F. E. 536. Rehm Asc. 631. I,inhart's F. Hung. 360, 

 Cke. F. Brit. Ser. I, 485. Desm. Pi. Crypt. Ed. I, p. 334, Ed. II, p. 961. 



Stromata gregarious, often 2-3 confluent, flattish-pulvinate or 

 shield-shaped, 2-5 mm. broad, orbicular or often with a sinuous, undu- 

 late outline, at first covered by the epidermis, then erumpent, with a 

 smooth, dark brown surface, whitish \vithin, surrounded -at base by 

 a black line. Perithecia numerous, monostirhous. sunk in the stroma, 

 ovate or angular from mutual pressure, rather small, with short necks 

 and punctiform, entire, perforated ostiola only slightly prominent. 

 Asci narrow-clavate, long-stipitate, p. sp. 40-55 x 4-6 fj.: Sporidia 

 subbiseriate, allantoid, yellowish-hyaline, 6-10 (mostly 5-8) xlJ-2 u. 



On dead saplings, New York (Peck), 



D. platystoma, (Schw.) (Plate 34) 



Sphtzria platystoma, Schw. Syn. Car.' 43. 

 Diatrype discostoma, Cke. Grev. VI, p. 144. 

 F,xsicc. Rav. Car. V, No. 55. Rav. F. Ain. 358. EH. N. A. F. 169. 



Stroma effused or oftener in suborbicular patches 1-2 cm. across 

 or elongated 2-4 x f-1 cm., soon erumpent, about 1 mm. thick, margin 

 abrupt, slaty-black or black. Perithecia monostichous, ovate-oblong, 

 J-J mm. high, closely packed. Ostiola prominent, hemispherical, 

 entire or quadrisulcate. Asci (p. sp.) 25-30 x 4 u. stipitate. Sporidia 

 subbiseriate, allantoid, hyaline, 6-8 x 1| /JL. 



On dead trunks of Ostrya Virginica, Carolina (Ravenel), Ohio 

 (Morgan), on dead Hcnrtunieli^ New York (Peck), on dead limbs <>l 



