British Clavanae. A. D. Cotton & E. M. Wakefield. 191 



the stem, and is more or less clearly separated from it. In 

 C. argillacca the stem is yellow or greenish-yellow, whereas in 

 C. straminea it becomes a brownish-red or cinnamon, and this 

 colour is liable, especially on handling, to spread over the 

 whole surface of the club. 



C.flavipes Pers., in Fries, Syst. Myc. i. p. 483, might possibly 

 refer to this species, but no specimen exists, and its identity 

 cannot be determined from the description and figures quoted. 



30. C. ARGILLACEA Fv., Syst. Myc. i. p. 482. 



C. argillacea Pers., Comment, p. 74; C. ericetorum Pars., 

 Obs. Myc. ii. 1799, p. 60. 



Illustrations: Boudier, Icon. Mycol. i. tab. 175; Fries, 

 Obs. Myc. ii. tab. 5, fig. 3; Pat., Tab. Anal. fig. 585, non 587. 



Plants simple, gregarious, 2-5 cm. high, pale greenish- 

 yellow, fragile; smell none, taste like tallow. Cluhs cylindrical 

 or flattened, with one or more grooves, surface often minutely 

 channelled, apex blunt. Stem distinct, yellowish. Internal 

 structure almost pseudoparenchymatous in transverse section, 

 even when old; cells regular, 10-14/^ in diameter, with small 

 narrow filaments (4-5 /i- in diameter) between; segments 

 5o-70|Lt long towards the margin, but up to 200-300/^ in the 

 centre. Basidia conspicuous, about 70/L1 long, contents granu- 

 lar, sterigmata 4. Spores smooth, hyaline, cylindric to elliptical 

 with a minute lateral basal apiculus, lo-ii x 5-6 ju, (or some- 

 times 10-14 ^ 6-7 /x), contents granular. 



Habitat. In heathy places. Not uncommon. 



This species is a typical plant of heather moors and similar 

 heathy places, on which it at times occurs in profusion and 

 occasionally in company with C. tenuipes. The only species 

 with which it is likely to be confused is C. straminea, which as 

 stated in the remarks under that species differs in its globose 

 spores and other characters. 



31. C. LUTEO-ALBA Rea, in Trans. Brit. Myc. Soc. ii. 1903, 



p. 66; Cotton, ibid. iii. 1907, pp. 30-31, 183. 



Illustrations: Trans. Brit. Myc. Soc. ii. 1903, tab. 3, fig. B; 

 Ibid. iii. 1907, tab. 11, fig. C (spores). 



Plants simple, isolated or in two's or three's, small, 3-5 cm. 

 high; smell none, taste like tallow. Clubs very slender, 

 1-5-3 rnm. thick, apricot-yellow with apex whitish, cylindrical 

 or slightly compressed, smooth, solid, usually attenuated, apex 

 acute or obtuse. Stem not sharply marked, often becoming 

 more distinct on drying. Flesh orange-yellow. Internal 

 structure not pseudoparenchymatous in transverse section, 

 but composed of loosely packed longitudinally running fila- 



S— 2 



