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RESEARCHES ON FUNGI 



Fig. 65. — Coprinus slerquilinus. Comparison of the stipe-base of a fruit-body 

 grown in daylight with the stipe-bases of two fruit-bodies grown in the dark. 

 A, grown in the light; B and C, grown in total darkness (c/. Fig. 66) ; a, the 

 solid stipe-base, h, the hollow stipe-shaft. Fruit-bodies shown in thin vertical 

 section. Culture mediiun, sterilised horse-dung balls. The fruit-body A soon 

 pushed its way up into the light and therefore light soon inhibited the growth 

 in length of its solid stipe-base which, in consequence, is relatively short. The 

 fruit-bodies B and C, having grown in the dark (cf. Figs. 61 and 62), could not 

 push up into the light and therefore light has not inhibited the growth of the 

 stipe-base which, in consequence, has grown to the maximum possible length. 

 In A, light inhibited the development of fruit-body rudiments on the illuminated 

 upper side of the dung-balls, but in C, in the absence of light, a fruit-body 

 rudiment on the top of the dung-ball continued to develop. The fruit-body 



