THE FUNGI WHICH CAUSE PLANT DISEASE 597 



considerably from the typical. In disinfection tests Patterson and 

 Charles showed the macrospores to be considerablj^ more resist- 

 ant than the microspores, also that fumigation kills superficial 

 spores and spores placed in incisions in the fruit. 



T. podocarpi Pet. is known from Podocarpus roots.^'* 



Torula Persoon (p. 595) 



Hyphse decumbent; conidiophores short, scarcely different 

 from the conidia, which are catenulate, breaking away singly or in 

 groups, dark to black, oblong to fusoid, smooth or roughened. 



Some one hundred fifty species, chiefly saprophytes. 



T. exitiosa d. Seyn is said to cause much injury to chestnuts. 



T. sphaerella Cke. causes a sooty mold of coffee. 



Monilochates Ellis & Halsted '^^ (p. 596) 



Hyphae brown; conidiophores obsolete or very short, conidia 

 like; conidia in chains, moniliform, dark; some chains interspersed 

 with larger conidia. 



Monotypic and poorly known. 



M. infuscans Ell. & Hals."" 



The mycelium grows subepidermally in sweet potato roots 

 causing discoloration and withering. The conidiophores arise 

 from the surface bearing their simple chains of conidia. 



PericonieaB (p. 594) 

 Conidia dark, capitate. 



Key to Genera or Periconies 



Fertile hyphse simple, but often with short 

 apical branches 

 Hyphse with apical branches or conidio- 

 phores 



Parasitic 1. Periconiella. 



Saprophytic 

 Apex with heterogeneous conidio- 

 phores 

 Apex swollen; conidiophores 3 to 4 2. Haplobasidium. 



