638 



H. suborbiculare, Pk. 30th Rep. p. 63. 



" Stroma thin, flattened, erumpent, surrounded by the ruptured 

 epidermis, growing from the inner bark, purplish-brown, then black, 

 the surface slightly uneven as if areolate-rimose. Perithecia monos- 

 tichous, subglobose. Ostiola sunken, perforate, sometimes whitish. 

 Spores unequally elliptical, colored, .0004-.0005 of an inch long.' 7 

 Mr. Peck considers this an ally of H. Laschii, Nits. 



On bark of Acer saccharinum, New York (Peck). Different 

 from H. suborbiculare, Welw. & Curr., and with that probably refer- 

 able to Nummularia. 



H. Morsei, B. & C. Grev. IV, p. 51. 



Hypoxylon Blaket, B. & C. Grev. IV, p. 52. 

 Hypoxylon pauperatum, Karst. Enutn. Fungi Lapp. p. 211. 

 SphcBria mammata, Nyl. Not. pro Fauna & Flora Fenn. p. 88. 

 Kxsicc. EH. & Evrht. N. A. F. 2d Ser. 2070, 2609. Ell. N. A. F. 1181. Rab. F. E- 2955. 



Stroma erumpent, orbicular, 3-5 mm. diam., closely embraced by 

 the ruptured epidermis, flattened above, brownish-black and papillose 

 from the prominent ostiola, surrounded by a black, circumscribing line. 

 Perithecia large (about 1 mm.), submonostichous, mostly only slightly 

 prominent, 4-15 in a stroma. Asci linear-cylindrical, 110-120 x 12 ju. 

 Sporidia uniseriate, oblong-elliptical, brown, 1-2-nucleate, 17-22 x 

 8-10 jul. 



On Alnus, Maine (Blake), New Hampshire (Mrs. Harrison), New 

 York (Peck); on Pyrus Malus, Carpinus, and Betula, Iowa (Holway). 



The Iowa specimens on birch have the stroma elliptical and 

 larger (1 x 1| cm.) and the perithecia have a tendency to crack away 

 from each other and separate. 



H. decorticatum, (Schw.) 



Sphczria decorticata, Schw. Syn. N. Am. No. 1179. 

 Hypoxylon decorticatum, Berk. Grev. IV, p. 50. 



Subpulvinate, flattened when on the wood, less so on the bark, 

 surface rusty-gray and densely covered with rough, sphaeriiform tuber- 

 cles resembling ostiola, so as to appear roughened with black granules. 

 Perithecia peripherical in several layers, ovate-globose, immersed in 

 the dark rust-colored stroma. Pulvinuli subrotund or irregular, about 

 5 mm. across, often confluent. Sporidia (sec. Cke. in Grev. XI, p. 123) 

 12-14 x 4 fi. 



On wood and bark, Bethlehem, Pa. (Schw.), New England 

 (Torrey). - . 



The spec, of this species in Herb. Schw. has sporidia 8-10 x 4 /i f 

 and has the same general appearance as H. perforatum, (Schwv). 



