167 



On rotten wood of Cyrilla, South Carolina (sec. Berk, in Grev. 

 IV, p. 52). 



The foregoing diagnosis was drawn from the specimen in Plow- 

 right's Sphaeriacei Britannici. 



The absence of any decided subiculnm will separate this from 

 R. aqu'da, and the glabrous perithecia from R. medullaris. The 

 absence or presence of an appendage on the ends of the sporidia, can 

 not be relied on as a distinguishing character, since in all three of 

 these species, the sporidia at one stage of growth, are more or less dis- 

 tinctly appendiculate. If R. mastoidea, Sacc., is really glabrous in 

 all stages of its growth, it must be, as Winter puts it, a synonym of 

 R. mammiformis. 



R. medullaris, (Wallr.) 



Sph&ria medullaris, Wallr. Fl. Crypt. Germ. II, p. 792. 

 Rosellinia medullaris, Ces. & De Not. Schema, p. 177. 

 Rosellinia Macouniana, E. & E. Bull. Torr. Bot. Club XI, p. 74. 



Perithecia gregarious or crowded, superficial, globose or ovate- 

 globose, |-1 mm. diam., covered at first, except the conic-papilliform. 

 black ostiolum, with a pruinose-tomentose or pruinose-pubescent coat 

 of a dull reddish-purple or brick-color, but finally becoming bare and 

 black. Asci (p. sp.) 100-120x7-8 //. Sporidia uniseriate, oblong, 

 only slightly curved, brown, 19-22 x 6-7 p., sometimes obscurely ap- 

 pendiculate, but mostly without any appendages. 



On decaying wood, Canada, Xew York and New Jersey. 



/ c? * 



The American specimens here referred to R. medullaris, become 

 glabrous when mature, though the purplish brick-colored, pruinose 

 coat is at first very distinct. As in R. aquila and R. thelena, the 

 wall of the perithecium is double and in thickness intermediate be- 

 tween these two species. There is only a very slight subiculum or 

 none at all, even in the early stage of growth. 



R. imitans, (C. & P.) 



Sphczria mutans, C. & P. 2gth Rep. N. Y. State Mus. p. 64. 

 Rosellinia mutans, Sacc. Syll. 944. 



Perithecia rather large (J-| mm.), gregarious or crowded, glo- 

 bose, papillate, black, at first clothed with a thin, tawny, evanescent 

 tomentuni, at length naked, smooth and shining. Asci subcylindrical. 

 Sporidia uniseriate, elliptical, brown, 10-13 p. long. 



On rotten wood, Tyre, N. Y. (Peck), Louisiana (Langlois). 



The Louisiana specimens have the sporidia 10-15x5-6 //, but do 

 not show the asci. 



