COPRINUS LAGOPUS 



311 



for, when their spores are sown on sterilised horse dung, the 

 resulting mycelium gives rise to large fruit-bodies of C. lagojms 

 resembling those of 

 Fig. 133 (p. 305).i 



(3) Fruit - bodies 

 grown in the dark. 

 Sterilised horse dung 

 in two crystallising 

 dishes was sown with 

 spores of Cop-inns 

 lagojms ; and, in the 

 same room, one dish 

 was placed on a table 

 in the light, and the 

 other dish in a cup- 

 board from which all 

 light was excluded. 

 After from two to 

 three weeks perfect 

 spore-bearing fruit- 

 bodies came up in 

 both dishes. The 

 fruit-bodies which had 

 been exposed to day- 

 light resembled those 

 shown in Figs. 133, 

 134, and 138, E-N 

 (pp. 305, 307, and 

 316), while those which 

 came up in complete 

 darkness are repre- 

 sented in Figs. 135, 136, and 138, 0, P (pp. 310, 311, and 316). 

 Both the lighted and the darkened fruit-bodies at first had white 

 fibrillae on their stipes, and the woolliness of the stipes in Fig. 135 

 can be readily perceived. As compared with the lighted fruit- 

 bodies, the darkened ones differed in : (1) having stipes which 

 1 These Researches, vol. ii, 1922, pp. 86-87. 



Fig. 130. — C'ojjrinus lagojms. Fruit-bodies grown 

 in complete darkness. Pure culture on a horse- 

 dung ball, from spores originating at Birming- 

 ham, England. Through having been handled, 

 the pilei have lost their fugacious scales and 

 the stipes their loose surface fibrillae. As in 

 Fig. 135, the pilei are relatively thinner than 

 pilei of equal height which have developed in 

 the light (c/. Fig. 137). Their greyness shows 

 that they have ripened spores upon their gills 

 and are therefore fertile. Natural size. 



