752 



spores exude. When the epidermis falls away, there is seen a con- 

 tiguous, black, cortical crust raised into numerous pustules by the 

 hemispherical, black, smooth perithecia. 

 Under the epidermis of Rhus glabra. 



1663. Sphoeria conspersa, Schw. Gregarious or scattered, at 

 first covered by the epidermis which finally falls off. Ostiola erum- 

 pent in the form of a minute, concave disk. Perithecia numerous, very 

 black, of medium size, flattened at the base and when the ostiolum falls 

 off, perforated. Perfect specimens are crowned with a sphaeriiform 

 ostiolum half as large as the perithecium. The base of the peri- 

 thecium is immersed in the bark and the whole is stained and black- 

 ened by the exuding spores. 



On Robinia viscosa, Nazareth, Pa. (Schw.). 

 Obturatce. 



1664. Sphceria Sclerotium, Schw, Syn. Car. 163. Scattered, 

 erumpent. Perithecia subovate, dark brown. Ostiolum impressed, 

 opening at first narrow, then round. At first sight resembles a 

 Sclerotium, but it is a true Sphceria, regular ovate-globose, a line 

 high, nearly free, seated in a kind of receptacle under the epidermis. 

 Color when dry, dirty white, with a small, yellowish sack inside. 



On young branches, Carolina (Schw.). 



1666. Sphceria erumpens, Schw. Syn. Car. 209. Subsimple, 

 scattered, erumpent. Perithecia ovate-depressed, ashy-brown, obso- 

 letely papillate, squamose below, smooth above. 



On dead branches of Smilax, Carolina. 



1677. Sphceria Ruborum, Schw. Scattered, gregarious or seri- 

 ate, soon throwing off the epidermis. Perithecia ovate-globose or 

 hemispherical, subimmersed in the bark, black, rugose, comparatively 

 large, crowned with a punctate-rugose tubercle half as large as the 

 perithecium or sometimes much smaller. The upper part of the peri- 

 thecium finally breaks away, leaving the cup-shaped base. 



Common on dead stems of Rubus. 



1678. Sphceria olivascens, Schw. Almost always covered by 

 the epidermis, causing an olive-black spot in the bark which is raised 

 by the minute, hemispheric-globose perithecia with their perforated 

 ostiola alone visible. 



On unknown twigs, Salem, N. C. 



1680. Sphmria amorphula, Schw. Densely aggregated or even 

 cespitose, seated in the substance of the bark under the epidermis, 



