462 A MANUAL OF THE PENICILLIA 



first largely submerged and appearing wet, subsequently developing abun- 

 dant conidial structures in marginal areas, white to buff shades (Ridgway, 

 PI. XL), radiately wrinkled in quadrants, with growing margin 1 to 2 mm. 

 wide, partially submerged, strongly funiculose, and with ropiness evident 

 but less conspicuous in older colony areas; no exudate produced; odor 

 lacking or indefinite; reverse uncolored to yellow^ish cream; penicilli com- 

 paratively small, usually consisting of a terminal verticil of 2, 3, or more 

 metulae bearing clusters of sterigmata and conidia in fairly well-defined 

 columns; conidiophores mostly arising from ropes of hyphae, usually less 

 than 100m by 4.0 to 5.0m, '^vith walls conspicuousl}' roughened; metulae 

 rough-walled, 8 to 12m by 2.5 to 3.0m bearing closely crowded sterigmata in 

 groups of 5 to 10 or 12, about 6, to 8m by 2.0m with walls sometimes defin- 

 itely roughened; conidia cylindrical to elliptical 4.0 to 5.0m by 2.0 to 3.0m, 

 smooth -walled, colorless in mass. 



Colonies on steep agar growing more rapidly than above, looser in tex- 

 ture, with surface growth conspicuously furniculose throughout the entire 

 colony area, sporulating more abundantly, with penicilli as described 

 above. 



Colonies on malt extract agar more restricted, 3.0 to 4.0 cm. in 12 to 14 

 days at 25°C., plane, with surface appearing slightly granular and with 

 funiculose habit reduced or almost lacking; penicilli abundantly produced, 

 borne on conidiophores arising primarily from the substratum, generally 

 somewhat larger than above, with sterigmata commonly 10m in length and 

 producing fairly well-defined columns of conidia up to 100 to 200m long. 



The species was described by Thorn, in 1930, from a culture (his No. 

 4658.34) sent to him by F.M. Putterill, Cape Town, South Africa. This 

 culture was quickly lost from his collection. A strain sent to us by the 

 Centraalbureau in May 1946, isolated by Neill from lumber in New 

 Zealand, has been examined in the present study. The latter culture, 

 maintained in our Collection as XRRL 2024, apparently differs from the 

 original only in producing conidia that are more consistently white, hence 

 approaches Penicillium pallidum Smith in general appearance and colora- 

 tion. 



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

 Nat. Ser. B., pp. 479-480, Taf. 52. 1927; Thom, The Penicillia, pp. 



484-485. 1930. 



Colonies on Czapek's solution agar spreading rather broadly, up to 3.5 

 to 4.0 cm. in 2 weeks, very thin, with vegetative mycelium wholly sub- 

 merged and hardly evident except when the culture is viewed toward the 

 light, producing limited conidial structures, mostly near the colony center, 



