635 



which the bark has not j-et fallen, but is also said to grow on decorti- 

 cated limbs and is then more effused. The specimens we have seen of 

 this effused form seem rathei' to belong to H. riihignosum.. 



H. malleolus, B. «& Rav. Grev. IV, p. 49. 



Exsicc. Rav. Fungi Car. IV, 32.— Ell. N. A. F. 861.— Rav. F. Am. l8l. 



Stroma globose, sessile, 1^ cm. diam., black, ornamented by the 

 papillose ostiola, each sunk in a shallow, circular depression about 

 \ mm. across. A vertical section of the stroma shows the same radiate- 

 fibrous, subzonate structure and shining black color seen in H, 

 Howaianum. Perithecia peripherical, oval or elliptical in outline, 

 forming a layer about 1 mm. thick, which readily separates from the 

 inner mass of the stroma. The asci (which appear to be evanescent) 

 have, in our specimens, disappeared, but there is an abundance of 

 brown, fusoid, nearly straight sporidia, 18-22 x3-3| //, ends sub- 

 obtuse. 



On oak trees, Carolina (Ravenel), Florida (Martin, Calkins, and 

 Ran). 



H. Murray!. B. «& C. Grev. IV, p. 49. 



" Gregarious, subglobose, a line or more broad, black without and 

 within, densely papillose with the minute ostiola. It resembles ex- 

 ternally H. homba, Mont., except the densely papillose vSurface." 

 Sporidia sec. Cke. in Grev. XI, p. 123, 13-15 x 5-7 p. 



On dead bark, Massachusetts (Murray). 



H. glomiforrae. B. & C. Grev. IV, p. 49. 



" Gregarious, hemispherical, nearly | inch wide, at first clothed 

 with ferruginous powder,' then black and shining, even. Perithecia 

 hidden without any external trace of ostiola. Stroma dark brown." 

 Sporidia sec. Cke. Grev. 1. c. 14-15 s 3| ji. 



On bark of Quercus nigra, Connecticut (Wright). 



H. cohserens, (Pers.) 



Sphtsria cohcerens, Pers. Syn. p. ii. 

 Hypoxylon coharens, Fr. Sumtna Veg. Scand. p. 42. 

 Exsicc. Fckl. F. Rh. 1053.— Rab. F. E. 918.— Thum. F. Austr. 1267.— Rav. Fungi Car. Ill, 

 48.— Cke. F. Brit. Ser. I, 665.— Rav. F. Am. 651.— Plowr. Sph. Brit. 2I7. 



Stromata erumpent-superficial, 2-4 mm. diam., gregarious or 

 crowded, and often confluent, hemispherical or globose, mostly flat- 

 tened above, at first dirty-brown, becoming nearly black. Perithecia 

 in a single layer, 6-10 in a stroma, rather large and distinctly promi- 



