MONOVERTICILLATA 231 



branches with secondary penicilli at lower levels, bearing conidia in tangled 

 chains up to 50 to lOO/x in length; sterigmata few in the verticil, numbering 

 about 5 to 8, mostly 5 to 6.5/i by 2;u (figs. 62A2 and 63F) ; conidia subglo- 

 bose, about 2.0/i or 2.5^, with walls appearing delicatelj' granular. 



Colonies upon steep and malt agars growing somewhat more rapidly 

 than upon Czapek, less strongly wrinkled, more nearly floccose but with 

 funiculose habit marked (fig. 63B), lighter sporing and with heavier conid- 

 ial development in central rather than marginal areas; exudate lacking and 

 colonies less strongly colored in reverse; penicilli often smaller but other- 

 wise as described above; conidia appearing finely but definitely roughened. 



Species description centered upon NRRL 737 received in 1928 from the 

 Centraalbureau as Zaleski's type and discussed by Thom in his Monograph 

 (1930) as No. 5010.1. 



Strains showing colony and structural characteristics approximating 

 NRRL 737 are commonly isolated from soil dilution plates and from ma- 

 terials subjected to soil or dust-borne contamination. Specific strains are 

 commonly marked by individual differences, particularly in regard to the 

 degree of ropiness, without showing adequate bases for separation. 



A culture, received in February 1946 from the Centraalbureau as 

 Zaleski's type strain, appears pathological and consistently produces col- 

 onies with a "wet" appearance; there are networks of sterile hyphae and 

 ropes of hyphae but only distorted fruiting structures. While the original 

 organism may be present, the strain no longer adequately represents the 

 fimgus described and figured by Zaleski (1928). NRRL 738, collected by 

 Professor M. B. Morrow from Texas soil, has the general appearance and 

 structures of Penicillium adametzi but produces a more compact mycelium 

 presenting a surface almost velvety at the margin and closely and radiately 

 wrinkled. 



Penicillium niklewskii Zaleski (Bui. Acad. Polonaise Sci.: Math, et Nat. Ser. B, 

 pp. 504-505; Taf. 60. 1927.) as originally described differed little from P. adametzi of 

 the same author. As examined by Thom and reported in his Monograph (1930), P. 

 niklewskii was more strongly funiculose, producing "bristly, prostrate and ascending 

 ropes or coremia of hyphae, . . . conidiophores mostly short branches from the funicu- 

 lose or fasciculate bundles of hyphae". The penicilli did not differ significantly 

 trom those of P. adametzi. NRRL 736 previously maintained in our Collection as 

 P. niklewskii is believed to comply with Zaleski's concept of that species, but the 

 species is not regarded as sufficiently different from P. adametzi to warrant continued 

 recognition. 



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

 Nat. Ser. B, pp. 501-502; Taf. 59. 1927. See also Thom, The 

 Penicillia, pp. 203-204. 1930. 



Colonies on Czapek's solution agar growing rather restrictedly, attain- 

 ing a diameter of 2.5 to 3.0 cm. in 12 to 14 days at room temperature, 



