ASYMMETRICA-DI^•ARICATA 309 



usually arising as short branches from aerial hyphae, 50fi or less in length 

 by 2.2 to 3.3m in diameter, or with penicilli borne terminally on long trail- 

 ing hyphae; penicilli extremely irregular in pattern with identity of parts 

 difficult to determine, ranging from monoverticillate or fractional, through 

 verticils of 3 or 4 uneven branches or metulae to very complex structures 

 with metulae and sterigmata borne at various levels on branches of unequal 

 length, metulae producing clusters of few sterigmata or growing out into 

 septate hyphae and usually producing a single sterigmata at the hyphal 

 tip; conidia elliptical or ovate, 3.0 to 3.5 by 2.2 to 2.8m, conspicuously 

 echinulate. 



Colonies on steep agar as on C'zapek in rate of growth and general colony 

 texture but lacking the raised central area, somewhat deeper — up to 3 

 mm., medium to fairly heavily sporing in shades near light to deep grayish 

 olive (R., PL XLVI); exudate lacking or limited; odor rather sharp, 

 ammoniacal; reverse in dull creamy yellow to pale buff shades; pattern of 

 penicilli somewhat more regular than above, but with numbers of parts 

 very variable; branches from 12 to 20 or even 30m by 2.5 to 3.0m; metulae 

 8 to 15m by 2.2 to 2.8m; sterigmata 8 to 12m by 2.0 to 2.5m, abruptly tapered 

 to form narrow conidium-bearing tubes not uncommonly 3 to 4m long; 

 conidia as described above. 



Colonies on malt agar spreading, 6.0 to 7.0 cm. in 12 to 14 days, plane, in 

 some strains white, fioccose 1 to 2 mm. deep and practically non-sporulat- 

 ing (fig. 82D); in others almost velvety and heavily sporing in shades near 

 slate olive (R., PI. XL^'II); exudate and odor lacking; reverse in dull 

 creamy yellow to yellow buff shades; conidiophores sometimes encrusted, 

 usually longer than en Czapek, ranging from 50 to 100m in length when 

 borne as branches and ^^■ith trailing hj^phae more often terminating in 

 conidial structures; penicilli as described above. 



Species description centered upon three cultures — all presumably de- 

 scended from Westling's t3'pe — namely: XRRL 1075 (Thom's No. 2549) 

 received in 1911 from Westling; XRRL 1076 (Thom's Xo. 4733.97) re- 

 ceived in 1924 from Biourge as his Xo. 376 which Thom had earlier sent 

 to him as Xo. 2549; and XRRL 2132, received from the Centraalbureau in 

 July 1946, as their strain of Penicillium piscarium obtained from Thom in 

 1930. The species is approximated by XRRL 2022, isolated from a piece 

 of untreated cotton duck at Beltsville, Maryland, by P. B. Marsh. 



Penicillium miczijnskii Zaleski, in Bui. Acad. Polonaise Sci.: Alath. et Nat. 



Ser. B., pp. 482^84, Taf. 46 and 53. 1927; also Thom, The 



Penicillia, pp. 488-489. 1930. 



Colonies on Czapek's solution agar growing restrictedly, attaining a 

 diameter of 3.0 to 3.5 cm. in 2 weeks at room temperature, azonate or be- 



