338 The North American Cup-Fungi 



Apothecia erumpent or subimmersed, occurring singly, or 

 occasionally two or three in a cluster, circular, or somewhat 

 irregular, sessile, scarcely narrowed below, 1-2 mm. in diameter 

 and scarcely half as high; hymenium concave to plane, or slightly 

 convex, brownish, or olive-brown, slightly pruinose; asci cylin- 

 dric-clavate, reaching a length of 100-140 /x and a diameter of 

 15-20 M. short-stalked; spores ellipsoid to ovoid, hyaline, straight, 

 or slightly curved, simple, or occasionally 1-3-septate, irregularly 

 2-seriate, 8-12 X 18-32 n; paraphyses filiform, hyaline, simple, 

 or branched 1.5-2 n in diameter, enlarged above to 5 pi- 



On Alnus crispa var. mollis. 



Type locality: Europe. 



Distribution: Toronto, Canada; also in Europe. 



Illustrations: M^xologia 32 : 114,/. 1-3; 116,/. 5. 



5. Pezicula Alni Rehm, Ber. Bayer. Bot. Gcs. 13: 199. 1912. 



Dermatella quercina var. Alni Sacc. Syll. Fung. 8: 490. 1889. 

 Dermatea Ahii Rehm in Rab. Krypt.-Fl. V: 252. 1889. 



Conidial stage forming beneath the outer bark and splitting 

 it but scarcely breaking through, slightly conical, or cushion- 

 shaped, less than 1 mm. in diameter, blackish; conidiophores 

 cylindric to clavate, simple, or branched, 2.5-4 X 12-30 ju. pro- 

 duced on the outer surface of the stroma; conidia ovoid to ellip- 

 soid, or subfusiform, hyaline, simple, one end with a small, 

 truncate apiculus, 5-7 X 14-18 m- 



Apothecia erumpent, mostly scattered, occasionally with 

 two or three in a cluster, circular, or slightly elongated, sessile but 

 narrowed below, reaching a diameter of 1 mm. and half as high ; 

 hymenium plane to convex, slightly pruinose, brownish-ochra- 

 ceous; asci broad-clavate, 4-8-spored, mostly 8-spored, reaching 

 a length of 100-130 n and a diameter of 18-20 m; spores ellipsoid, 

 irregularly 2-seriate, at first simple, becoming 1-3-septate, 

 7-10 X 15-25 ii; paraphyses filiform 2-2.5 ji in diameter. 



On species of AIniis, Alnus crispa var. mollis, A. incana. 



Type locality: Europe. 



Distribution: Nova Scotia to Michigan and South Carolina; 

 also in Europe. 



Illustrations: Mycologia 32: 114,/. 2; 116,/. 6, 7. 



ExsiccATi: Rav. Fungi Car. 5: 46 (as Patellaria rhaharbarina). 



