110 A MANUAL OF THE ASPERGILLI 



Aspergillus pseudoglaucus Blochwitz, in Ann. Mycol. 27: 207. 1929; 

 emend Thorn and Raper, U.S.D.A. Misc. Publ. No. 426, p. 12. 1941. 



Colonies upon Czapek's solution agar (3 percent sucrose) restricted in 

 growth, radiately wrinkled, yellow-green to shades of gray, consisting of a 

 mixture of small conidial heads, young or aborted perithecia and more or 

 less colorless hyphae ; reverse orange at center becoming lighter toward the 

 margin. 



Colonies upon Czapek's solution agar with 20 percent of sucrose spread- 

 ing, strongly wrinkled in a predominantly radiate manner, consisting of a 

 felt of orange-encrusted hyphae enmeshing abundant perithecia, orange 

 except at margin where yellow-green predominates from the presence of 

 small conidial heads admixed with perithecia in the mycelial felt (fig. 25 C) ; 

 reverse yellow becoming orange-brown or maroon in marginal areas. 



Perithecia abundant, spherical to subspherical, mostly 60 to 80m though 

 occasionally 100m in diameter, yellow, embedded in a felt of orange my- 

 celium; asci 10 to 12/i in diameter; ascospores lenticular, 4.6 to 5.2/x by 

 3.6 to 4.0m, occasionally 5.6m m long axis, smooth-walled, with equatorial 

 region rounded or flattened, without ridges, and with furrow generally 

 lacking though occasionally showing as a trace. Conidial heads few in 

 number and generally submerged in the mycelial felt, small, mostly 50 to 

 75m in diameter but occasionally up to 100m; conidiophores mostly 150 to 

 300m in length, 5 to 8m at the base, broadening to a terminal vesicle 12 to 

 20m in diameter; sterigmata in a single series, 6 to 8m by 3 to 4m; conidia 

 subglobose, delicately spinulose, variable in size ranging from 5.5 to 7.5m 

 in diameter. 



Represented in the NRRL collection by No. 40 received from Baarn 

 as A. pseudoglaucus Blochwitz and No. 41 received from George Smith as 

 A . fumigatoides Bain, and Sart. 



There is reason to believe that the former culture is directly derived from 

 Blochwitz 's type. It becomes necessary therefore to emend the description 

 given by him insofar as the measurements and markings of ascospores and 

 conidia are concerned. Gould and Raistrick (1934) reported biochemical 

 data upon a culture, No. A 38, received from Biourge as A. fumigatoides 

 Bain, and Sart. (NRRL No. 41), which is identical with A. pseudoglaucus 

 (NRRL No. 40) as sent to the authors by Westerdijk. Obviously the cul- 

 ture from Biourge is incorrectly named. It does not fit the species descrip- 

 tion nor the figures of A. fumigatoides (1909) in the size of its conidia, the 

 character of its perithecial wall, or the pattern of its ascospores. The asco- 

 spores of A . fumigatoides are shown as roughened over their entire surfaces, 

 as in A. fischeri, whereas those of No. 41 certainly belong in the A. repens 

 series. Distinctive colony characters, however, maintained stably through 

 many transfers, together with the size of the conidial apparatus, warrant 

 separating A. pseudoglaucus from A. repens and maintaining it as a species. 



