656 



II 



can not pcrliaps now bo certainly (lecitlcd. It agi'ces toleialily with 

 Todc's fitrni'c, l>ut it is not tliat species as understood liy Nitsclikciind 

 described by him (under Hypoxylon sei/ti/'/mi)erK(i?n) as having' sjio- 

 ridia 16-20 X 8-10 /i, and by Fckl. (under the mnnc oi' II. ndiciii) i\^ 

 havinji: si)oridia 28 x 10 //. We have theiefore acci : 'ed //. linvencJ'''. 

 Rehni, as a distinct species. 



H.? afrotViscnm, B. ik €. 



J'lickrlia atiofusia, B. S: C. Grev. XII, p. 51. 



Pustules erunipent, very small (hardly 1 mm. diani.j, ellipticiil. 

 margined l»y the ruptured bark. Pei'ithecia unequally distributed in 

 the l)lack, depressed stroma. Asci cylindi-ical, stipitate. Spoiidia 

 elli](tical, brown, 13x7 //. 



On bark o^ Rhus glabra, mountains of Virti'inia. 



H. liydiiicoliim, (Sclivv.) 



Spkana liyil>iicola, Scliw. Syii. N. Am. 1207. 

 Hypoxylon hydnicolum, Cke. Syii. 1034. 



Stroma thick, short, subrepand, here and there confluent: ex; th- 

 ally very black, granulose. Perithecia large, subdistant, inuneisod in 

 the light yellow substance of the stroma, monostichous, tiinnslie<l witli 

 a brown veil or sack. Ostiola prominent, jjapillifoi'm. The tectli nf 

 the Hydnum are often conci-escent with the stroma, which then 

 ap[)ears stipitate. Substance of the stroma distinctly suberose. The 

 diameter of the stroma scarcely exceeds 4-6 nnn. 



Rathei- rare; on the teeth of decaying //2/(?/<«w«s, Bethlehem, Pa. 

 (Schw.). 



From an examination of the specc. in llerli. Schw. we add the 

 following notes: Sti'oma subtubercular. 2-4 mm. across. Peritlicciii 

 only slightly prominent. Ostiola papilliform. Asci 75-80 // long. 

 p. sp. 60 X 6 /i, cylindrical. Sjioridia uniseriate, elliptical, jtale brown, 

 with a single large nucleus, 10-11 x4 //. 



H. exaratiiiii, (Scliw.) 



Sp/iaiia e.raiata, Schw. Syii. N. Am. 1206. 

 Hypoxylon cxaxi/iini, Cke. Syu. 1032. 



Effigui'ately eflused, surl'ace marked with j»arallcl, longitudinal 

 furi'ows, at fust covered by the e|)idermis which is persistent in tlic 

 furrows. Pei'ithecia very jirominent on the ridges, irregular, black- 

 brown, with a black pai»illate ostiolum, rather large, monostichous, 

 surrounded with a scanty stroma, which has a sterile, suluepaiid 

 margin, and rests on a crust formed of the blackened sul)stance of thi' 

 bark. 



