238 FUXGUS-FLORA. 



Helotium terrigenum. Cke. & Phil., in Hb. Kew. 



Ascojihores scattered, shortly stipitate, stern stout, slightly 

 narrowed downwards, at first almost globose, then concave, 

 finally more or less plane, margin often wavy, firm, glabrous, 

 pallid or the disc with a tinge of tan-colour, about 2 mm. 

 broad and high ; excipnlum parenchymatous, basal cells 

 irregularly polygonal, 6-8 /x diameter, becoming long and 

 narrow upwards, and running out at the margin into slender 

 hyphae of variable lengths ; asci cylindric-clavate, apex 

 slightly narrowed, base attenuated into a slender, usually 

 curved pedicel, 8-spored; spores irregularly 2-seriate, hya- 

 line, continuous, narrowly elliptical, ends rather acute, 

 straight or very slightly bent, 28-32 X 6 /x ; paraphyses 

 numerous, hyaline, septate, about 2 /x thick, very slightly 

 thickened at the tip. 



Helotium pileatum, Karst., Phil., Brit. Disc, p. 160. 



On branches buried in the ground in very damp places. 



Type specimen in Herb. Kew., examined. 



The species described above was at first considered to be a 

 new species by Cooke and Phillips, and the MS. name "He- 

 lotium terrigenum, C. & P." was given. In Brit. Disc, p. 160, 

 Phillips considers this supposed new species to be identical 

 with H. pileatum, Karst., Myc Fenn., p. 130. In this deter- 

 mination I do not agree with Phillips ; Karsten's species 

 differs in colour, scanty paraphyses, a?id in the tip of the 

 ascus becoming very deep blue with iodine, whereas in 

 H terrigenum the asci are not at all changed in colour by 

 iodine. 



Helotmm citrinum. Fries, Summa Teg. Scand., 

 p. 355; Phil., Brit. Disc, p. 157; Sacc, Syll., viii. n. 910. 



Usually crowded, sometimes growing into each other and 

 forming irregular patches, very shortly stirntate, at first 

 clavate and closed, then expanding until almost plane, mar- 

 gin usually upraised when dry, glabrous, 1^-2 mm. across, 

 firm, lemon yellow ; excipulum formed of intricately inter- 

 woven, hyaline hyphae about 3 /x thick ; asci elongated, nar- 

 rowly cylindrical, attenuated at the base into a long, slender, 

 crooked pedicel, 8-spored; spores obliquely 1-seriate, or 

 sometimes inclined to become 2-seriate near the tip, hyaline, 

 continuous, elliptical, smooth, 2-4-guttulate, 9-12 x 3-4 /x; 



