662 A MANUAL OF THE PENICILLIA 



cultural and microscopical characters. NRRL 1043 received from Pro- 

 fessor Westerdijk in 1930 exactly duplicates these strains. 



Cultures differing from the above, but obviously closely related, include: 



NRRL 1765, received in 1941 from C. W. Hesseltine as an isolate from 

 Wisconsin soil which differs from typical strains by producing more re- 

 stricted colonies that are somewhat darker green in color, and produce 

 conspicuously roughened conidia. 



NRRL 2114, from Professor W. H. Weston as an isolate from deterior- 

 ating military equipment, differs from typical strains in producing very 

 restricted, non-sporulating, colorless to yellow colonies on Czapek's agar 

 and larger colonies of the same general texture, with marginal areas in 

 blue-green shades near verdigris to zinc green (R., PI. XIX) on steep agar; 

 colonies on malt are typical of the species except somewhat lighter sporing 

 and show an increased development of yellow mycelium. 



NRRL 1042 from the Thom Collection as P. lemoni Sopp (Thom's No. 

 5320. Tal) differs in producing deeper, rather floccose colonies in zinc 

 green shades (R., PI. XIX) and with limited conidial structures borne on 

 long conidiophores ; the colony reverse is in deep greenish black shades. 



The correct placement of Penicillium herquei Bainier and Sartory remains 

 somewhat in doubt. Penicilli typically consist of terminal verticils of 

 metulae bearing sterigmata and conidia in tangled chains, and are usually 

 symmetrical in pattern. Furthermore, colonies normally show yellow en- 

 crusted hyphae more or less abundantly, especially in older colonies on 

 malt extract agar. Many strains produce a definitely fragrant odor sug- 

 gesting black walnuts or apples, as in the P. purpurogemim series. These 

 characters seem to relate the species to the Biverticillata-Symmetrica where 

 it was placed by Thom in 1930. The sterigmata of this species, however, 

 are clearly different from those of typical members of that section, and the 

 penicilli are usually more divaricate, as shown by Bainier's original figures. 

 If assigned outside the Biverticillata-Symmetrica (considered but not pro- 

 posed), the series would seem to fit best either as a separate series in the 

 Asymmetrica-Velutina or possibly as a long-stalked member of the P. 

 brevi-compactum series. 



Penicillium herquei Bainier and Sartory is regarded as representative of a 

 rather variable series of strains characterized by fairly short and compact 

 penicilli, long roughened conidiophores, and colonies with a dark yellow- 

 green coloration in reverse and commonly in the aerial vegetative mycelium 

 of more floccose cultures as well. Individual strains vary appreciably in 

 colony texture and in overall pattern, depending upon the relative abun- 

 dance of fruiting structures and sterile pigmented hyphae. Thom, in 

 1930, included five species in his "P. herquei series," including P. aureum 

 Corda, P. lemoni Sopp, P. elegans Sopp, and P. olsoni Bainier and Sartory, 



