ASYMMETRICA-DIVARICATA 295 



others developing a succession of colors ranging from yellow Or yellow- 

 green through orange, or orange-red, to reddish or vinaceous purple. 



Conidiophores arising directly from the substratum or as branches from 

 trailing aerial hyphae, ranging from very short up to 1 mm. in length, 

 with walls usually granular or roughened. 



Penicilli variously branched and ranging from single terminal verticils of 

 sterigmata (appearing monoverticillate) to as^mimetric structures com- 

 posed of an indefinite number of strongly divaricate branches and/or 

 metulae bearing verticils of sterigmata. 



Sterigmata few in the verticil, slender, and characteristically tapering 

 abruptly to conspicuously narrowed beak-like conidial tubes. 



Conidia at first definitely elliptical, usually becoming ovate to subglobose 

 in age Avith one or both apices often pointed, and with walls smooth or 

 delicately roughened. 



Series Key 



1'. Conidial chains strongly divergent and/or becoming tangled in age, not tending 

 to form columns, 

 aa. Sterigmata abruptly tapered to narrow conidium-bearing tubes; colonies 



usually not funiculose P. janthinellum series 



1". Conidia elliptical, rough with echinulations arranged in spiral or trans- 

 verse bands P. daleae Zaleski 



2". Conidia elliptical to subglobose, usually roughened but with echinulations 

 not arranged in spiral or transverse bands, 

 aaa. Vegetative mycelium and colony reverse often strongly colored 

 (orange-red, reddish purple, etc.) in new isolates 



P. janthinellum Biourge 



bbb. Vegetative mycelium uncolored to light buff or peach, colonies spor- 



ulating sparingly or tardily; colony reverse colorless or in yellow 



to orange shades 



1'". Conidiophores conspicuously roughened; penicilli commonly 



consisting of a terminal verticil of divergent metulae; conidia 



elliptical to subglobose, finely echinulate; reverse uncolored 



to yellow P. simplicissimum (Oud.) Thom 



2'". Conidiophores finely roughened; penicilli irregular; conidia 

 elliptical, smooth or finely roughened; reverse in orange 



shades P. ochro-chloron Biourge 



3'". Conidiophores smooth or nearly so; penicilli commonly irregu- 

 lar; conidia elliptical to subglobose, conspicuously rough- 

 ened; reverse in cream to light tan shades 



P. piscarium Westling 



4"'. Conidiophores smooth or nearly so; penicilli irregular; conidia 



subglobose to elliptical, smooth; reverse in bright yellow to 



yellow-orange shades P. miczynskii Zaleski 



In 1918, Thom, in Pratt's "Soil Fungi of Idaho" (Jour. Agr. Res. 13: 

 94-95, figs. 3 and 4) discussed these forms under the heading "Soil Peni- 



