KEY TO PENCILLIA 209 
4%. Colonies not producing red color. 
1. Colonies gray rarely greenish, very loose 
floccose 2.0... cece eee ee eee P. intricatum 
2. Colonies green, conidial chains in simple 
compact column ............... P. No. 48 
3. Colonies gray to green, hyphe scattered 
CYEEPING. 6. eee ees P. decumbens 
HA. Surface hyphe not in well-defined ropes, nor trailing. 
7. Surface hyphz woven floccose, course of hyphe 
not traceable. 
1. Gray green long conidiophores, no odor ...P. camemberti 
47. Surface growth at margin simple conidiophores, in 
older parts both hyphe and conidiophores. 
1. Gray greenish, branching of conidiophores 
rather loose, odor none or slight... ..... P. No. 22 
2. Green, conidial fructifications rather com- 
pact, odor definite ““moldy”.......... P. commune 
N. B. There is probably a number of races in 
this group. 
jij. Fruiting surface velvety—of simple conidiophores 
or conidiophores borne so close to surface of 
substratum as to appear simple: 
k. Conidial mass a dense column of conidial chains. 
1. Column from a single verticil of basidia....P. spmulosum 
2. Column from a verticil of branchlets with 
verticillate cells and chains........... P. rubrum 
kk. Elements of conidial fructification not in column. 
kk. Elements of fructification not in a column. 
l. Conidia smooth. 
1. Green, broadly speaking, ripe conidia glo- 
bose, 4-5 mitrons..............---6- P. roquefort 
2. Green, less spreading, conidia elliptical, 
medium commonly purpled........... P. purpurogenum 
3. Gray or olive green, conidia 5-7 by 3-5 
DOICYONS.. ete eeeeees P. digitatum 
HW. Conidia delicate ruguloSe..... secs seeees reece P. rugulosum 
