130 A MANUAL OF THE PENICILLIA 



a. Colonies generally spreading broadly on most media. 



1'. Conidia globose to subglobose P. frequentans series 170 



aa. Colonies with conidial areas strictly velvety and with re- 

 verse usually in orange-brown to reddish purple shades. 

 I". Conidia mostly 2.5 to 3.5m, with walls thin, smooth, or 



finely roughened P. frequentans Westling 172 



2". Conidia mostly 4.0 to 5.0m, with walls heavy, dark green, 

 and coarsely roughened 



P. purpurrescens (Sopp) n. comb. 177 

 bb. Colonies with conidial areas strictly velvety and with re- 

 verse usually in bright orange-red to red shades 



P. multicolor G.-M. and P. 

 (see P. implicatum series, p. 196) 

 cc. Colonies with surface loose-textured, with conidial struc- 

 tures arising from the substratum and from aerial my- 

 celia, and with reverse uncolored, pinkish, or in purplish 



drab shades P- spinulosurn Thom ISO 



2'. Conidia elliptical to ovate. 



aa. Conidia and conidiophore walls roughened, with colonies 

 on malt not developing "sclerotium-like" structures 



P. lividum series 18') 

 1". Colonies deeply lanose, conidiophores 400 to 500m or 

 more in length, reverse uncolored or in fairly light 

 shades, 

 aaa. Conidia broadly elliptical to ovate, conspicuously 



roughened P. lividum Westling 190 



bbb. Conidia narrowly elliptical with ends pointed, 

 delicately roughened 



P. aurantio-violaceuvi Biourge 192 

 2". Colonies not deeply lanose, conidiophores compara- 

 tively short, reverse in deep violet to violet-black 



shades, conidia spinulose P. trzebinskii Zaleski 194 



bb. Conidia and conidiophore walls smooth, with colonies on 

 malt agar developing "sclerotium-like" structures 



P. turhatum Westling 



(in P. thomii series) 



b. Colonies growing rather restrictedly upon most media, especially 



Czapek's solution agar P. implicatum series 196 



r. Conidial areas light blue-green, colony reverse in bright orange- 

 red or red shades, conidia globose to subglobose, in parallel 



or divergent chains P. midticolor G.-M. and P. 198 



2'. Conidial areas commonly deep blue-green, colony reverse in 

 orange-brown or maroon shades, conidia broadly elliptical, 



usually in compact columns P. implicatum Biourge 201 



3'. Conidial areas yellow-green to gray-green, reverse in orange-red 

 shades (approaching brick red), conidia strongly elliptical or 



pyriform P- suhlateritium Biourge 203 



2. Colonies appearing velvety or with surface lightly floccoso; conidio- 

 phores borne primarily as short branches from loosely trailing or 



compacted vegetative hyphae P. decumbens series 205 



a. Colonies loose-textured, with margin usually thin and generally 



