FUNGOUS AND INSECT FRIENDS. 



547 



Two kinds of spores are produced. The first of these, 

 not heretofore reported as being produced by this fungus, 

 are borne in rather conical knobs, Fig. 120 A. These knobs 

 are composed of spores (conidia) 

 borne upon a very short stalk, 

 called the conidiophore. When 

 clustered together over the dead 

 scales these conidiophores give 

 a pebbled appearance to the part. 

 They are grey in color. The spores 

 (conidia) Fig. 120B are divided into 

 three parts, trident-shaped, the cen- 

 tral one being the largest. Each 

 side projection has from five to 

 eight cells, while well-developed 

 central ones have about fifteen. 

 After having dried for a time, these 

 trident-shaped conidia spread apart 

 hetd^T colidiroTspores" the application of moisture 

 sports 801 ' r sp re ases and and thus are set free from the 

 conidiophore. If placed under the microscope and a drop 

 of water is added, they move like animate objects. 



The other kind of spores, (sporidice) are twelve to 

 fifteen celled, club-shaped and produced, eight together, 

 in a spore case (Fig. 120 C). In this stage the fungus as- 

 sumes a gray dirty buff color. These spores are special- 

 ly provided to carry the fungus through periods unsuit- 

 able to its growth. 



Both kinds of spores (conidia and sporidia) are in- 

 strumental in disseminating the disease. It serves as a 

 very efficient check in many cases against the Long and 

 Purple scales. 



Fig. 120. Spores and spore 

 cases of gray-headed fungus 



