596 THE FUNGI WHICH CAUSE PLANT DISEASE 



Conidia clavate 4. Gongromeriza. 



Chains breaking up witii difficulty 



Chains curved 5. Gyroceras. 



Chains straight or nearly so 6. Honniscium. 



Hyphae hyaline 7. MonUochaetes, p. 597. 



Thielaviopsis Went. ^^ (p. 595) 



Hyphffi creeping, subhyaline; conidiophores simple, septate; 

 conidia of two kinds; macroconidia catenulate, ovate, fuscous; 



Fio. 399.— T. ethaceticus. 

 After Wakker and 

 Went. 



Fio. 400.— Torula. After 

 Saccardo. 



microconidia cylindric, hyaline, catenulate within the conidiophore. 

 In part=Trichosph£eria. 



Only two species, both of economic importance. 



T. paradoxa (d. Seyn) v. Hohn (=Chalara paradoxa.) 



Macroconidia 16-19 x 10-12 n; microconidia 10-15 x 3.5-5 fi. 



It is the cause of a pineapple rot, in which r61e it was first de- 

 scribed in 1886; and of a sugar cane disease."' 



In addition to micro and macrospores the fungus possesses a 

 pycnidial form. With variation of the substratum the spores vary 



