44 FUNGUS-FLOBA. 



and contain hyaline multinucleate spores, 22-25 x 8-10 /a, 

 borne on longish basidia. 

 Psilospora quercina, Rab. 



Dichaena faginea. Fries, Elench., ii. p. 141 ; Eehm, 

 Krypt.-Flora, Hyst., p. 51 ; Sacc, Syll., ii. n. 5737. 



Growing on living bark ; ascophore erumpent, becoming 

 rather prominent, oblong, at length forming effused, rugu- 

 lose patches. 



Hysterium fagineum, Rabh., Pilze, p. 155. 



On smooth, living beech bark. 



Resembling D. quercina in habit and structure, but the 

 perithecia are larger. 



Var. coryi ea ; Fries, Elench. Fung., ii. p. 142; Sacc, Syll., 

 ii. n. 5737. 



Ascophore smaller, slightly prominent, somewhat rounded, 

 becoming confluent and forming prominent, rugulose patches. 



On hazel bark. 



Var. capreae, Rehm, Krypt.-Flora, Disc, p. 51, figs. 3-5, 

 p. 49 ; Sacc, Syll., Suppl. ix. n. 4396. (fig. 12, p. 22.) 



Ascophores gregarious on pale, roundish spots, immersed, 

 bursting through the epidermis; roundish then elongated, 

 obtuse, membranaceous, rugose, black, h mm. long, \-± mm. 

 broad; ostiolum at first roundish then elongated, margin 

 irregular, narrow ; asci fusoid, base broad, sessile, 8-spored ; 

 spores hyaline, continuous, usually 1-guttulate then minutely 

 granular, elliptic-oblong, ends obtuse, 27-30 X 12-14 /x; 

 paraphyses filiform, 2 • 5 /x thick, tinged brown above. 



On living bark of Salix capraea. 



Usually only 3-4 spores attain their full development in an 

 ascus. A doubtful Dichaena if the spores are permanently 

 continuous. 



Dichaena strobilina. Fries, Summa Yeg. Scand., 

 p. 40; Ckc, Hdbk., p. 932, f. 406; Sacc, Syll., ii. n. 5738. 



Gregarious, erumpent, somewhat irregular, roundish at 

 first, rather soft, opaque brown then black, dehiscing by a 

 narrow longitudinal slit ; asci usually 8-spored ; spores 

 fusoid, slightly curved, 3-guttulate then 3-septate, hyaline, 

 smooth, 10-13 /x long. . 



