ASYMMETRICA-VELUTINA 



369 



buff or olive-ocher (R., PI. XXX) to amber or wax yellow (R., PI. XLI); 

 ronidial structures as described above. 



Colonies on malt extract agar growing rapidly, 5.5 to 6.0 cm. in 10 to 12 

 days, plane (fig. 97B), never furrowed, velvety, usually azonate, in clear 

 blue-green shades near sage green to artemisia green (R., PL XLVII); exu- 

 date lacking; reverse lightly colored in dull orange-brown shades; conidial 

 structures as described above but tending to develop better defined columns 

 of conidia. 



Species description centered upon the type strain, NRRL 821, from the 

 Thom Collection as No. 2541, received from Westling in December 1911, 

 as an isolate from branches of Hyssopus in Norway; NRRL 824, Fleming's 



Fio 98. Penicilli in dittprent strains of I'ciuciLLium nulatum, X loO. A, NRRL 

 824. B, NRRL 1950. C, NRRL 8.32. (After Raper and Alexander, 1945 Jour. 

 Elisha Mitchell Scientific Society, 61, 1945.) 



isolation, made at St. Mary's Hospital, London, in 1928, originally reported 

 as Pemcillium ruhrum Biourge, but subsequently diagnosed as P. notatum 

 Westling by Thom; NRRL 827, received from Dr. R. St. John Brooks, 

 National CVjllection Type Cultures, London, in 1936, as a culture from 

 Professor Frederick Challenger, University of Leeds, as a "green mold" 

 capable of volatilizing potassium telluride; NRRL 830 and NRRL 832, 

 from the Biourge collection by Simonart in 1936, in tubes labeled "ohscu- 

 riim" and "lacticus jNIaze" respectively; and scores of additional strains 

 isolated and examined over a period of many years. A culture received 

 from the Centraalbureau in February 1946, as P. griseo-roseum Dierckx, 

 from Biourge in 1929 and possibly type, duplicates NRRL 827 almost ex- 

 actly in cultural and microscopical characteristics. 



The species is very abundant in nature and shows the same general dis- 

 tribution listed for the series (see p. 374). 



