Thom: Penicillium Luteum-Purpurogenum Group 141 
ccc. With yellow area restricted to a narrow zone shading quickly to ivy-green. 
Culture Thom No. 3S23.4y from Virginia soil. 
bb. Colonies showing yellows above only in age, in reverse slowly but deeply 
orange to red. Conidia rough. 
d. Without coremia — P. rugulosum.^ 
Fig. I. Penicillium purpurogenum var. rubri-sclerotinum. a, b, typically 
verticillate branching at the apex of the conidiophore ; c, in this conidial fruc- 
tification the main axis is prolonged to bear a secondary verticel above the 
first ; e, d, conidia bearing cells or sterigmata ; i, conidia ; f, g, h, diagram- 
matic representation of the entire conidial apparatus ; k, germination of con- 
idia. The morphology represented here shows the essential features of the 
entire group. In some the conidial chains are massed into solid columns, in 
others as in this divergent. 
dd. With numerous long coremia — P. duclauxi.^ 
AA. Conidial areas prominent from the first. Reverse colors predominantly 
red. Pinophilum-purpurogenum section. 
, C. Colonies develop yellow and green areas together, which remain more or 
less persistently mixed. 
20 Thom, C., 1 . c. p. 6o and p. 42. The relationship of these organisms 
to each other and to the other members of the group may only be superficial 
but this necessitates their citation here. 
