32 



MR. BERKELEY ON THE POTATO MURRAIN. 



ber of spores attached to little spicules 

 — a structure quite different from that 

 of Botrytis. 



I have also figured the little mould 

 alluded to above as once occurring on 

 a tuber which had long been diseased 

 instead of Botrytis infestans. It has 

 all the characters of Dactylium, in 

 consequence of which I had named it 

 in my lierbarium Dactylium tenuissi- 

 mum : I have, however, since the figure 

 was sent to the engraver, seen young 

 plants of Fusarium Solani Tuberosi, 

 Desm., which resemble it so closely 

 that I am inclined to think it merely a 

 more persistent state than usual of that 

 species. 



P«^ 



Fig. A. Botrytis Bassiana, from a sketch by Dr. Montagne. a. Young threads I. Tliread 

 more advanced, with young spores, c. Ditto full grown, with mature spores. 



