96 CULTURAL STUDIES OF SPECIES OF PENICILLIUM. 



BB. Sclerotia not (or rarely) produced (under special conditions). 

 (Use gelatin cultures (1) and (2), compare agar cultures). 



C. Rapid liquefiers (abundant liquid in 5 to 12 days). 



D. With definite, strong ammoniacal odor: 



1. Yellowish brown-avellaneous spores rough P. brevicaule. 



2. White or cream, spores rough P. brevicaule, var. album. 



3. White or cream, spores smooth P. brevicaule, var. glabrum. 



DD. Without ammoniacal odor. 



E. With yellow coloration of liquefied gelatin (not of mycelium in reverse). 



1. Colonies small, conidiophores 100-150// in length P. citrinum. 



2. Colonies broadly spreading, conidiophores 250-300,u. .P. chrysogenum. 

 EE. Without yellow color in liquefied gelatin (or slight traces only). 



e. Colonies white to pink or salmon P. roseum. 



ee. Colonies some shade of green. 



/. Colonies floccose, margin spreading by stolons P. stoloniferum. 



ff. Colonies velvety-surface growth of fruiting hyphae only. 

 g. Conidiophores very "short (100-200/t): 



1 P. No. 12. 



2 P. No. 37. 



gg. Conidiophores longer (200-400^): 



1. Conidiophores variously branched, reverse always colorless. .P. No. 24. 



2. Conidiophores each with a verticil of branches — each branch 



bearing a columnar fructification — reverse and medium dark- 

 ened in sugar media P. atramentosum. 



CC. Liquefaction of gelatin none or slower than 10-12 days, or only partial. 

 G. Colonies never green. 



h. Colonies yellowish brown, spores elliptical P. divaricatum. 



hh. Colonies white to lilac, slow liquefier, 14-16 days P. lilacinum. 



hhli. Colonies floccose white or creamy: 



1 . Conidiophores long, typical penicillate branching, 



P. camemberti, var. rogeri. 



2. Conidial chains borne upon short branches of floccose hyphae, 



P. No. 33. 

 GG. Colonies some shade of green. 



H. Surface with hyphae definitely in ropes or trailing, bearing numerous conidio- 

 phores as short branches distinctly traceable to their origin in such 

 hyphae . 

 i. Colonies usually red below and reddening the substratum. 



1. Fruiting areas dark green P. funiculosum. 



2. Fruiting areas mixed yellow and green P. pinophilum. 



ii. Colonies not producing red color: 



1. Colonies gray rarely greenish, very loose floccose P . intricatum. 



2. Colonies green, conidial chains in simple compact columns. . P. No. 28. 



3. Colonies gray to green, hyphae scattered, creeping P. decumbens. 



