166 



cylindrical, p. sp. 8U-90 x 6-7 fi, with abuEdant paraphyses. Sporidia 

 uniseriate or partly biseriate above, subinequilaterally elliptical, brown, 

 subacute, 10-12 x 5-5 J /i. 



On rotten wood. Common from Canada to Florida and Louisiana, 

 but apparently not so common in the Rocky Mt. region and on the 

 Pacific coast. 



After the subiculum has disappeared this may still be distinguished 

 by its thin, shining perithecia. 



R. thelena, (Pr.) ? 



{Sphcsria thelena, Fr. in Kunze Mycol. Hefte II, p. 36.)?. 

 Rosellina thelena, Rab. F. Eur. No. 757, Winter Die Pilze, 3082. 

 Kxsicc. Kunze Fungi Sel. 343. — Rab. F. Eur. 757, 1536. — Thumen M. U. 1949. 



Perithecia scattered or gregarious or sometimes crowded, spheri- 

 cal, with a strongly papilliform ostiolum, smooth, thin and brittle, 

 brownish-black, about 1 mm. diam., seated on a superficial, loosely ad- 

 hering, densely interwoven but thin, brownish-purple subiculum. Asci 

 cylindrical, stipitate, 8-spored, 90-130 x 8-9 // (p. sp.), with congluti- 

 nated paraphyses. Sporidia uniseriate, oblong, subinequilateral, brown, 

 18-23x6-7 //, with a short (6-8 //), hyaline, spine-shaped appendage 

 at each end. 



This differs from R. aquila in its thinner and more fragile peri- 

 thecia and the longer, spine-like appendages of the sporidia. 



The typical form of this species has not yet been reported as found 

 in this country, but var. pinea, Sacc. (Thiim. M. U. 1949), has been 

 sent from British Columbia by Dr. Macoun. In mature specimens, the 

 spine-like appendages of the sporidia mostly disappear, but even in this 

 stage, this species may be readily distinguished from R. aquila, by its 

 much thinner and more fragile perithecia. 



B. Perithecia not on a distinct subiculum. 

 R. mammiformis. (Pers.) 



SpheEria ntammtzformis, Pers. Syn. p. 64. 

 Hypoxylon mammarforme, Berk. Grev. IV, p. 52. 

 Hypoxylon globulare, (BuU) Fckl. F. Rh. 1060 (sec Winter), 

 Rosellinia mammiformis, Sacc. Syll, 938, 

 Exsicc, Plowr, Sph, Brit, No, 70— Fckl, F, Rh. lo6o, 



Perithecia gregarious or crowded, and often confluent (2 or 3 in 

 one), globose, double walled, the outer wall thinner than in R. aquila 

 and more fragile, glabrous, nearly black, 1-1 1 n diam., bare but not 

 polished; ostiolum strongly and abruptly papilliform, black and sub- 

 shining. Asci (p, sp.) 100-115x8-10 ^, with abundant paraphyses. 

 Sporidia uniseriate, oblong-elliptical, inequilateral or slightly curved, 

 19-25 x 7-9 fi, mostly without any distinct apiculus. 



