1899] 



MICROSCOPICAL JOURNAL. 



353 



The material for the following experiments was some of 

 the so-called "original" material, obtained from Takamine. 

 This original material is a portion of koji, which was 

 grown without any special precautions to keep it pure. 

 Pure cultures were made from this material, and were 

 also used. 



A. oryzaB is a mould of a yellowish green color when 

 seen in the mature stage. The color varies with the age 

 of the plant and also with the medium upon which the 

 plant is grown. Favorable solid media are bran, rice,and 



Fig. 3. Germination of conidia in a moist chamber. 



wort geletine. On rice and wort gelatine the young 

 growths are of a light yellow green, the color being due 

 to the numberless conidia formed. As the growth ages, 

 the color changes to dark olive green. On plate cultures 

 the mycelia are usually in colonies, due to the massing and 

 germination of a number of conidia in one spot; as a re- 

 sult, the plate presents a very irregular growth appear- 

 ance (frontispiece, fig. 1). On bran the color of the young 

 growth is much darker than that of the same age on rice, 

 and in all growths the color is brownish olive to dark 



