COLLETOTRICHUM TRICHELLUM 



179 



may be mentioned Collet otrichum trichellum (Ft.) Duke (= Vermi- 

 cularia trichella Ft.), a species studied by Miss Duke, to whom the 

 author is indebted for Fig. 106. Miss Duke ^ sowed many spores of 

 the Colletotrichum in a hanging drop of water and observed that 



Fig. 103. — Ascobolus magnificus. Surface of a sterilised liorse-dung culture, 

 showing a number of large fully -expanded fruit-bodies in which spore- 

 discharge was in progress. Photographed by B. O. Dodge. Natural size. 



the young myceha freely joined with one another so as to form a 

 mycehal network (Fig. 106, C, D, and E). It seems likely that, 

 under natural conditions, the acervuli (Fig. 105), which develop 

 on the leaves of the Ivy {Hedera Helix), often originate from a 



^ The hyphal fusions here under consideration were observed in the course of 

 a systematic study of the old genus Verraicularia. Cf. Maud M. Duke, " The 

 Genera V ermicularia Fr. and Colletotrichum Cda," Trans. Brit. Myc. 80c. , vol. xiii, 

 1928, pp. 156-184, 



