430 A MANUAL OF THE PENICILLIA 



comparatively coarse and characteristically separate, occasionally show- 

 ing limited aggregation into ropes or fascicles; colony reverse usually 

 colorless or developing dull yellowish or drab shades. 



Conidiophores arising from the substratum or from the mycelial felt, 

 comparatively coarse in most species, often long, up to 500/i or more, 

 and in some species and strains 1 mm., usually unbranched except in the 

 terminal area, with walls typically roughened. 



Penicilli comparatively large, asymmetric, often irregularly branched 

 with metulae and sterigmata commonly borne at different levels in the 

 penicillus. 



Conidia usually smooth-walled, comparatively large, variable in form 

 from subglobose to elliptical, usually borne in tangled chains and form- 

 ing irregular masses. 



Odor pronounced, mold}^ in some strains unusually strong. 



Series Key 



B. Colonies quickly developing some shade of green in conidial areas. 



P. commune series 



1. Floccose mycelium uncolored and with reverse uncolored or in drab shades, 



usually heavily sporing on malt agar. 



a. Conidia globose or nearly so, less than 4.0/x in diameter, finely roughened. 



P. lanosum Westling 



b. Conidia elliptical or in age becoming subglobose, commonly up to 4.0;/ or 



more in diameter, smooth-walled. 

 1'. Conidial areas in rather bright yellow-green shades. 



P. lanoso-viride Thorn 

 2'. Conidial areas bluish green to gray -green. 



aa. Conidial areas wdth blue element pronounced, near bluish glaucous, 



deeply floccose P. lanoso-coeruleum Thom 



3'. Conidial areas with green to gray -green shades predominating; at first 

 court gray to gnaphalium green, becoming olive in age. 

 aa. Colonies with unusually strong actinomyces-like odor. 



P. hiforme Thom 

 bb. Colonies with odor less pronounced. 



1". Colonies forming a felt 300 to 1000m deep P. commune Thom 



2". Colonies deeply floccose, 1 to 2 mm. deep. 



P. lanoso-griseum Thom 



2. Vegetative mycelium yellow to orange, at least adjacent to the substratum; 



reverse orange to bay; non-sporulating or very lightly sporulating on malt 

 agar. 



a. Colonies deep, 2.0 to 3.0 mm., loosely floccose, lightly sporulating upon 



Czapek and steep agars P. aurantio-candidum Dierckx 



b. Colonies thinner, definitely fasciculate, usually heavily sporing on Czapek 



and steep agars P. aurantio-virens Biourge 



(in P. cyclopium series, p. 503) 



Members of the series appear to be limited in nature since they occur 

 rather infrequently among cultures isolated from soil or among the acces- 



