643 



color, becoming black, outline irregular,' mostly elongated (3x1 cm.) 

 and about 1 or 1^ mm. thick, surface even or subtuberculose, closely 

 papillate from the abundant ostiola, which are surrounded by an 

 annular depressed area as in H. marginatum, and H. annulatum, 

 smaller, however, as well as the perithecia themselves, than in either 

 of these species. Asci narrow-cylindrical, about 40 x 4 // (p. sp.). 

 Sporidia oblong-elliptical, uuiseriate, 4^5 x 1^-2 fi, pale brown, some- 

 times a little bulging on one side. Perithecia monostichous, J mm. or 

 less in diam. The general appearance is that of H. rubiginosum, 

 from which, as well as from the two above-named species, it is dis- 

 tinguished by its much smaller sporidia. The specimens in Rav. F. 

 Am. are labeled H. marginatum, Schw., but they cannot be that 

 species. 



On wood and bark of various deciduous trees, Quercus, Myrica, 

 etc., Georgia (Ravenel), Florida and Tennessee (Calkins). 



H. callostroraa, (Schw.) 



Sphesria callosiroma, Schw. Syu. N. Am. No. 1208, and New Am. Sph. tab. XI, 



fig. 9- 

 Hypoxylon callostroma. Berk. Grev. IV, p. 51. 



Irregularly effused, 2-3 inches long and wide, oi- in subturbinate 

 groups of smaller size and seriately arranged, but not really confluent, 

 in this case resembling H. turbinulatum. The effused specimens 

 resemble at first sight some simple Sphairia with large perithecia 

 closely crowded together, but a section shows that they are joined 

 below in a common stroma which, on the outside, is black. The sur- 

 face is uneven, granulose and punctate-rugose from the slightly promi- 

 nent perithecia, which have their apices truncate with an obtusely 

 subconic ostiolum immersed below in a grumose, bright ochraceous-red 

 stroma of varying thickness. The perithecia themselves are oval or 

 irregular in shape, consisting of an outer bark or shell enclosing the 

 shining black, ascigerous nucleus. The colored stroma is always 

 present, even when reduced to the simplest form enclosing but a single 

 perithecium. Sporidia 12 x 5 // (sec. Cooke in Grev. XI, p. 125). 



On wood and bark of Laurus mstivalis, Bethlehem, Pa. 

 (Schweinitz). 



H. xanthostroma, (Schw.) 



Sph^ria xanthostroma, Schw. Syn. N. Am. 1212. 

 Hypoxylon xanthostroma, Sacc. Syll. 1507. 



Seated on a thin crust which is not at all effused. In a simple 

 series emerge distinct tubercles which are sometimes confluent for an 



