358 RESEARCHES ON FUNGI 



(7) Cultures. C. lagopus grows well on sterilised horse-dung 

 balls, and on this medium new fruit-bodies can be obtained with 

 certainty in about fifteen days after the spores have been sown. 

 On the other hand, C. macrorhizus grows relatively poorly on 

 sterilised horse-dung balls and takes a longer time to produce fruit- 

 bodies. Both species retain their structural peculiarities when 

 grown in parallel cultures side by side in the same laboratory. 



(8) Size of fruit-bodies. The fruit-bodies of C. macrorhizus are 

 as a rule larger and less fragile than those of C. lagopus. Both in 



Fig. 179. — Coprinus macrorhizus. Two fully expanded, revo- 

 lute, and almo.st exhausted fruit-bodies, removed from 

 stable manure. Some of tlie spores have settled on the 

 stipes. Photographed at Birmingham, England. Natural 

 size. 



the open and in culture the fruit-bodies of C. macrorhizus, if pro- 

 duced at all, attain a certain minimum size which is considerable. 

 On the other hand, the fruit-bodies of C. lagopus, while able to 

 attain a large size under favourable conditions, yet on exhausted 

 horse dung or under conditions of competition may be extra- 

 ordinarily small. The stipes of C. lagopus vary in length from 

 about 10 cm. down to 1-10 mm. and their expanded f)ilei from about 

 3 cm. in diameter down to 0- 75-3-0 mm. Thus dwarf fruit-bodies 

 occur in C. lagopus (Fig. 138, A, B, C, Vol. Ill, p. 316) but not in 

 C. macrorhizus. 



