44 FUNGUS-FLOKA. 



and contain liyaline multinucleate spores, 22-25 X 8-10 fj., 

 borne on longish basidia. 

 Psilosjpora quercina, Eab. 



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

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



G-rowing on living bark ; ascopbore erumpent, becoming 

 ratber prominent, oblong, at lengtb forming effused, rugu- 

 lose patcbes. 



Hysterium fagineum, Eabb., Pilze, p. 155. 



On smootb, living beecb bark. 



Eesembling D. quercina in babit and structure, but tbe 

 peritbecia are larger. 



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

 ii. n. 5737. 



Asoopbore smaller, sligbtly prominent, somevrbat rounded, 

 becoming confluent and forming prominent, rugulose patcbes. 



On bazel bark. 



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

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



Ascopbores gregarious on pale, roundish spots, immersed, 

 bursting through tbe epidermis ; roundish then elongated, 

 obtuse, membranaceous, rugose, black, | 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 /*; 

 parapbyses 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 tbe spores are permanently 

 continuous. 



Dichaena strobilina. Fries, Summa Veg. Scand., 

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



Gregarious, erumpent, somewhat irregular, roundish at 

 first, ratber 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, 

 smootb, 10-13 [>. long. 



