300 The North American Cup-Fungi 



4. Cenangium furfuraceum (Roth) Sacc. Syll. Fung. 8: 565. 



1889. 



Peziza furfur acea Roth, Catal. Bot. 3: 257. 1806. 

 Phibalis furfuracea Wallr. Fl. Crypt. Germ. 2: 447. 1833. 

 Dermatea furfuracea Fries, Summa Veg. Scand. 362. 1849. 

 Encoelia furfuracea Karst. Myc. Fenn. 1: 218. 1871. 



Apothecia erumpent in cespitose clusters of five or six each, 

 or more rarely occurring singly, at first entirely closed, finally 

 opening rather irregularly and expanded but with the margin 

 usually incurved, externally whitish-furfuraceous, the individual 

 apothecia reaching a diameter of 1 cm. or more; asci narrowly 

 clavate, reaching a length of 80 ix and a diameter of 6-7 m, 

 8-spored; spores narrow-ellipsoid, or allantoid, often with two 

 small oil-drops, 2-4 X 8-10 m; paraphyses filiform slightly en- 

 larged above. 



On branches of species of Alnus. 



Type locality: Europe. 



Distribution: Newfoundland to Idaho, California, south 

 to Iowa, and Pennsylvania; also in Europe. 



Illustrations: Roth, Catal. Bot. pi. 9, f. 2 (as "ThelepJwra 

 fimbriata'). 



ExsiccATi : Shear, N. Y. Fungi 327; Brenckle, Fungi Dak. 426. 

 Wilson & Seaver, Ascom. 52. 



5. Cenangium pruinosum (Ellis & Ev.) Seaver, comb. nov. 



(Plate 130.) 



Peziza pruinosa Ellis & Ev. Jour. Myc. 4: 100. 1888. 

 Dermatea pruinosa Sacc. Syll. Fung. 8: 555. 1889. 



Apothecia gregarious, occurring in large numbers underneath 

 the outer bark of the host, which rolls back exposing large 

 blackened areas on which the apothecia are seated, the individual 

 apothecia deep cup-shaped with the mouth at first constricted, 

 expanding and reaching a diameter of 3-4 mm., externally 

 covered with a white, granular coat, brown to brownish-black 

 inside and out, the margin slightly crenate, when dry becoming 

 boat-shaped or angular; asci narrow-clavate, reaching a length of 

 55 n and a diameter of 4-5 ^u, 8-spored; spores minute, allantoid, 

 2 X 8-10 m; paraphyses filiform, very slender, enlarged above, 

 with dark-brown tips. 



On trunks of Populus. 



