Plate I. Development of pigment at the base of a fungus colony growing on an 

 artificial medium. The yellow hue is characteristic of Microsporum lanosum, while 

 the port-wine eolor is characteristic of Trichophyton purpureum. In the lower group, 

 pigment developed only in mediums containing one of certain monosaccharides 

 and was not synthesized when the available sugar was a disaccharide. (See p. 10.) 



