436 A MANUAL OF THE PENICILLIA 



late in older cultures on malt extract agar. NRRL 930, received from 

 Professor Macy as an unidentified Penicillium is believed to represent a 

 floccose, lightly sporulating variant of P. lanoso-viridc Thom. A strain 

 obtained under this name from the Centraalbureau, in May 1946, received 

 by them from Thom in 1936 and probably stemming from the type cul- 

 ture, duplicates the above in all essential details but retains the bright 

 green colors over a longer period. 



Penicillium lanoso-coeruleum Thom, in The Penicillia, pp. 322-323. 1930. 



Colonies upon Czapek's solution agar (Col. PI. VII) growing fairly 

 rapidly, about 4.0 to 5.0 cm. in diameter in 10 to 12 days at room tempera- 

 ture, deeply floccose, up to 5 mm. in deepest areas (fig. 113E), with sur- 

 face very uneven, appearing deeply ridged or broadly tufted, azonate or 

 nearly so, with growing margin white, 2.0 to 3.0 mm. wide, with conidial 

 areas shading from bluish glaucous at the margin to deep bluish gray- 

 green in the denser areas (Ridgway, PL XLII), with blue coloration pro- 

 nounced; exudate limited, clear; odor not pronounced but moldy; reverse 

 uncolored or in dull yellowish buff shades; conidiophores arising primarily 

 from the aerial felt, mostly 200 to 600// by about 3.0;U, sometimes longer, 

 with walls pitted or delicately roughened; penicilli asymmetric, commonly 

 consisting of a terminal verticil of metulae or showing one or more branches 

 with verticils of metulae and sterigmata (fig. II2B2) and bearing conidial 

 chains in a loosely columnar or tangled mass (fig. 112Bi), sometimes up 

 to 200ai or more in length; branches extremely variable, from 7.0 to 25.0^ 

 in length but mostly 10.0 to 15.0/x by 2.8 to 3.3m; metulae in verticils of 3 

 to 5, mostly 10 to 15^ by 2.5 to 3.0yu; sterigmata few in the verticil, about 

 8.0 to 10.0/x by 2.0 to 2.5/i; conidia showing some ellipticity, up to 3.5 or 

 even 4.0ju by 2.5 to 3.0^, less commonly subglobose, smooth- walled. 



Colonies on steep agar growing somewhat more rapidly than on Czapek 

 but essentially duplicating the above in texture and general appearance, 

 sporulating more heavily and more quickly developing gray shades; exu- 

 date limited, clear; odor pronounced, somewhat moldy; reverse uncolored 

 or in light yellowish orange shades; penicilli as described above. 



Colonies on malt extract agar, heavily sporing throughout, plane, 

 deeply lanose with conidiophores arising largely from the substratum 

 (fig. 113F), with conidial areas in fairly bright yellow-green shades near 

 sage green (R., PI. XLVII) or Russian green (R., PI. XLII); exudate 

 lacking; odor pronounced moldy; reverse in golden yellow shades; penicilli 

 as described above. 



Species description centered upon the type, NRRL 888, from the Thom 

 Collection as No. 2543a. This culture was isolated originally as a deeply 



