I'9IO.] SCLEROTINIA DISEASE OF THE GOOSEBERRY. 3 



or of the more compact tufts shown at x in Figs. 2 and 3, is 

 taken and placed in a drop of water under the microscope, 

 the structure will be seen to be the same. In both cases the 

 fructification shown at Fig. 4 will be seen. We see (to the 

 left) a number of upright branches (conidiophores) rising 

 from the spawn of the fungus which creeps horizontally ; 

 these upright branches are brown in colour and bear side 

 branches which, as well as the main branches, give rise at 



FiG. 4. — Fructification of Botrytis ; to left, group of three branched conidiophores 

 bearing heads of spores (a) ; to right, apex of main branch of a conidiophore and 

 of one of its side branches, showing the way the spores (b) are borne on minute 

 stalks, or sterigmata (c). Highly magnified. 



the tip to a roundish head of very minute oval spores (a in 

 Fig. 4.) A large number of these very minute spores (which 

 measure about io/ll x Sf 1 *) are produced in each head. In 

 the drawing to the right (Fig. 4) the tip of a main branch, 

 and of its side branch, is shown more highly magnified; here 

 most of the spores have fallen off, but some of the spores 

 (b in Fig. 4) can be seen attached to the little stalk (sterigma) 

 (c in Fig. 4) on which they are borne. It is these crowded 

 upright branches, or conidiophores, densely packed side by 

 side, and each bearing numerous heads of many thousands 



* /J. one-thousandth of a millimeter. 



B 2 



