THE USE OF THE MANUAL 89 



C. Conidial stalks and heads coarse— heads clavate A. clavatus group 



CC. Heads not clavate D. 



D. Colonies mostly showing yellow perithecia and more or 



less yellow and red hyphae A. glaucus group 



,DD. Colonies lacking yellow perithecia and more or less yel- 

 low and red hyphae E. 



E. Colonies producing columnar spore masses F. 



EE. Colonies producing radiate, globose, or hemispherical 



heads H. 



F. Rapidly growing and spreading colonies G. 



FF. Slowly and restrictedly growing colonies A. restrictus series 



G. Conidial columns long, narrow A.fumigatus group 



GG. Conidial columns short and broad; perithecia usually 



present, ascospores red A. nidulans group 



H. Heads radiate in blue-green, dull green, to pale tan or 



flesh-colored shades A. versicolor group 



HH. Heads in some other color L. 



K. Heads in long compact columns, avellaneous to cinna- 

 mon, shading toward colorless through light flesh 

 colors A. terreus group 



KK. Heads in some other color L. 



L. Colonies more or less floccose; heads in dull olive-grays 



to fuscous A. ustus group 



LL. Heads in some other color M. 



M. Young heads white or only slightly tinged in age N. 



MM. Heads in some other color O. 



N. Young heads white, usually in short columns, broad- 

 ening at apex, often becoming avellaneous in age. . . . A. flavipes group 



NN. Heads persistently white, larger heads definitely globose 



or radiate A. candidus group 



O. Heads in sulphur yellow to ochre shades A. ochraceus group 



00. Heads in some other color P. 



P. Young colonies showing a greenish color passing into 



brown A . tamarii group 



PP. Heads not showing greenish Q. 



Q. Heads in purple-brown to black shades A. niger group 



QQ. Heads in yellowish-brown shades, orange to deep brown 



to umber color A. wenlii group 



