442 A MANUAL OF THE PENICILLIA 



areas. Penicillium lanoso-griseum is obviously closely related to P. 

 commune Thom, and differs from the latter primarily in producing much 

 deeper colonies. The significance of this difference is somewhat ques- 

 tioned, since a strain returned to us in May 1946 by the Centraalbureau 

 as a culture from Thom in 1930 (and presumably the type) is culturally 

 and microscopically almost indistinguishable from the type of P. commune 

 as maintained at this Laboratory. It is possible that the description of P. 

 commune Thom should be broadened to include forms now regarded as 

 representative of both species. 



Penicillium aurantio-candidum Dierckx, in Biourge, Monograph, La 

 Cellule 33: 116-119; Col. PI. I; PI. II, fig. 4, PI. XXIII, fig. 136. 

 1923. Thom, The Penicillia, pp. 319-320. 1930. 

 Probable Synonym: P. aurantio-albidum Biourge, in Monograph, La 



Cellule 33: fasc. 1, pp. 197-198; Col. PI. Ill and 

 PI. V, fig. 28. 1923. Thom, The Penicillia, p. 

 322. 1930. 



Colonies on Czapek's solution agar at 25°C. attaining a diameter of 

 2.0 to 2.5 cm. in 10 days, deeply floccose up to 2.0 to 3.0 mm. in central 

 areas, thinning only slightly at the margin, showing few shallow, radial 

 furrows, loose-textured, at first white, becoming glaucous blue to greenish 

 glaucous blue (Ridgway, PI. XLII) with the development of mature peni- 

 cilli, finally gray in age near storm gray (R., PI. LII); little or no exudate 

 produced; odor pronounced, "moldy"; reverse in orange or orange-red 

 shades becoming Sanford's brown or auburn to mahogany red or bay in 

 age (R., PI. II); with agar becoming conspicuously colored in broad zones 

 beyond the colony margin during the growing period; conidiophores vari- 

 able in length up to 1 mm. or more by 3.5 to 4.0m or 4.5/i in diameter, ap- 

 pearing smooth or finely roughened, supporting large penicilli up to 50 to 

 60/x in length bearing tangled chains of conidia 50 to 75m long; penicilli 

 much branched, asymmetric, irregular in pattern wdth branches, sub- 

 branches, and metulae of varying length commonly occurring in the same 

 penicillus, hence, bearing sterigmata and conidia at different levels; 

 branches commonly 10 to 20m by 3.0 to 3.5m; metulae commonly 10 to 

 12m by about 3.0 to 3.5m; sterigmata about 7.0 to 9.0m by 3.0 to 3.5m; 

 conidia smooth-walled, elliptical to subglobose with ellipticity generally 

 evident when viewed in chains, mostly 3.0 to 3.5m by 2.5 to 3.0m, larger 

 individuals occasionall}^ seen. 



Colonies on steep agar growing more rapidly, about 3.5 cm. in 10 days, 

 deeply floccose up to 3 to 4 mm., slightly furrowed, bearing abundant 

 conidiophores and colored as on Czapek; no exudate produced; odor more 



