260 FUNGUS-FLOEA. 



On dead leaves of Populus trcmula ; also on oak leaves, 

 along with Helotium epiphyllum, in Kehm, Ascom., n. 152. 



Specimen examined in Tuckel's Fung. Khen., n. 2388. 



Allied to H. epiphyllum, but distinguished by the smaller 

 obtusely pointed spores. 



Helotium albidum. Pat, Tab. Anal. Fung., 382; 

 Rehm, Krypt.-Flora, Disc., p. 797. 



Gregarious or scattered, at fiist subglobose and closed, 

 then becoming plane or slightly convex, margin entire, ivory- 

 white, 12 mm. across; stem slender, up to 1 mm. long, 

 sometimes brownish at the base ; excipulum parenchymatous, 

 cells at base irregularly polygonal, those at the sides parallel 

 and radially elongated, 10-16 x 6-8 /A; asci clavate, apex 

 narrowed, 8-spored; spores smooth, hyaline, elliptic-oblong 

 or elliptic-fusiform, usually slightly curved, continuous and 

 2-3-guttuiate, then ] -septate, 15-18 x 3-4 p., irregularly 

 2-seriate above; paraphyses hyaline, 3 //. across at the 

 slightly thickened tip. 



Peziza albida, Eoberge, in Desm., Crypt. France, ser. i., 

 n. 2004. 



Hymenoscypha albida, Phil., Brit. Disc., p. 138. 



On petioles of fallen ash leaves. 



Specimen from Roberge, in Herb. Kew, examined ; Desm. 

 11. 2004 is identical. 



Far. aesculi, Phil., Brit, Disc., p. 138. 



Spores larger than in the typical form, 20-23 x 4-5 p., 

 and more frequently clavate. 



On petiole of horse-chestnut leaf. 



Helotium ilicis. Phil., Brit. Disc., p. 164; Sacc., 

 Syll., viii. n. 987. 



Ascophores scattered, sessile and fixed by a central point, 

 at first subglobose and closed, then expanding and becoming 

 plane or slightly convex, margin distinct, rather thick, often 

 wavy, smooth, up to I mm. across ; hypothecium composed 

 of densely inter woven" hyphae; base of excipulum minutely 

 but distinctly parenchymatous, passing into parallel, closely 

 packed narrow hyphae at the sides ; disc almost egg- yellow, 

 margin paler ; asci cylindric-clavate, apex narrowed, pedicel 

 rather stout, 8-spored ; spores irregularly biseriate above, 

 fusiform, ends rather blunt, hyaline, 2-guttulate, finally 



