330 A MANUAL OF THE PENICILLIA 



Sopp illustrates so clearly, the strain would seem to fit his description 

 satisfactorily. 



The species is retained to include strains producing conidial structures, 

 often small, but essentially like Penicillium nigricans (Bainier) Thom, 

 and with colonies tending to be floccose, light sporing, and generally white 

 or nearly so (figs. 88E and F). 



Represented in the NRRL Collection by No. 2043, received from the 

 Centraalbureau in March 1946, as Janke's isolation. 



Penicillium kapuscinskii Zaleski, in Bui. Acad. Polonaise Sci.: Math et 

 Nat. Ser. B, pp. 484-485; Taf. 55. 1927. Thom, The Penicillia, 



pp. 355-356. 1930. 



The following species description is taken from Thom's Monograph : 



"Type strain growing fairly well about 20°C., very slightly at 30°C., or above; 

 colonies on Czapek's solution agar about 20°C., restrictedly growing 15 to 20 mm. in 

 diameter in twelve to fourteen days, appearing velvety but with very thin felt at base, 

 buckled and radiately wrinkled sometimes in quadrants, with conidial area gray- 

 green, deep olive gray (Ridgway, PI. LI) at first, becoming drab in age (brownish 

 drab, Ridgway, PI. XLV) with mycelial hyphae, and marginal 3 mm. white, showing 

 stolon-like hyphae reaching beyond the submerged mycelium and re-entering the 

 substratum; hyphae very delicate; reverse in pale orange shades; drops, small, color- 

 less, well distributed over the conidial area; conidiophores; (variable in length, aris- 

 ing from the substratum or from aerial hyphae — K.B.R.); penicillus partly mono- 

 verticillate, mostly variously showing one-branch, a group of sterigmata around the 

 main axis at the first septum; branches (or metulae?) 12 to 15/x long; sterigmata 8 to 

 lO/i by 2.0 to 2.5m with conidial chains divergent; conidia 2.5 to S.O/x, with delicate 

 roughenings or spinulosity seen only under oil immersion. 



"Culture No. 5010.12 received from Baarn in July 1928, tallied well enough with 

 Zaleski's description to be accepted as type." 



During the period since the publication of Thom's Monograph, the type 

 strain of Penicillium kapuscinsJdi has been lost from our Collection. A 

 culture, presumably type, however, was received from the Centraalbureau 

 in April 1946 and is now maintained as NRRL 2147. Careful examination 

 of this culture suggests the validity of the strain but fails to satisfy the 

 description of the mold as it was known to us in culture from 1928 to 1930. 

 The strain now produces colonies that are thin, closely wrinkled and very 

 light sporulating with many, if not an actual majority, of the penicilli 

 appearing monoverticillate. Conidial areas are in dull gray shades and 

 conidia are finely roughened as indicated in Thom's (1930) description. 



The species is retained to include occasional members of the Penicillium 

 nigricans series which produce conidia that are globose but only finely 

 roughened, and which are often less deeply colored in surface and in re- 

 verse than typical representatives of P. nigricans itself. 



