THE ASPERGILLUS GLAUCUS GROUP 117 



Culture NRRL No. 76 (fig. 30 F) is characterized by a close felt of 

 red-brown hyphae, which completely covers the agar surface and in 

 which scattered perithecia are borne. Conidial heads are scarce and 

 largely confined to the colony margin. This strain, which was included in 

 Gould and Raistrick's study of pigmentation in the Aspergillus glaucus 

 group (1934), was received from George Smith under the name Aspergillus 

 lovainensis and attributed to Biourge. Except for its dark color this 

 fungus in culture bears a striking resemblance to one received from Baarn 

 as Aspergillus profusus (NRRL No. 44), which showed similar floccose 

 habits. However, the ascospores of the latter are smaller and less furrowed 

 and are essentially smooth along the equatorial margin. The degree of 

 relationship between the two is questionable. 



In addition to the ascosporic strains definitely placeable in the series, 

 George Smith has recently described A. proliferans in which the prolifera- 

 tion of the sterigmata has become so pronounced as to become the most 

 conspicuous character, while perithecium formation has been suppressed. 

 In colony characters, however, it belongs here. This strain diverges 

 further from the type as described but may be arbitrarily placed here by 

 the branching of its simplified heads and the size and markings of its 

 conidia. 



Aspergillus proliferans George Smith, in Brit. Mycol. Soc. Trans. 26(1/2): 



26, PI. III. 1943. 



Colonies on Czapek's solution agar spreading very slowly, with growth 

 at first largely submerged, then with matted floccose aerial mycelium, white 

 changing to yellowish shades, sporing tardily, with conidial areas gray- 

 green, reverse yellowish-brown; on wort agar growing slowly but better 

 than on Czapek, with mycelium white then yellow and finally orange and 

 tardy development of gray-green to gray conidial areas, becoming more 

 deeply floccose in age especially at shallow end of the slope ; reverse yellow ; 

 normal conidial heads loosely radiate; conidiophore smooth, thin-walled, 

 usually with one or two septa, 4 to 14m in diameter; vesicles occasionally 

 almost globose, more frequently obconical or mere broadening of the ends 

 of the conidiophores, up to about 20m in diameter; sterigmata when normal, 

 in one series, 8 to 1 lju. by 3.5 to 6m, often elongate, septate and bearing 

 small secondary heads, frequently resembling heads of monoverticillate 

 Penicillia, or with upper portion much swollen and appearing almost as 

 very large, thick-walled conidia with long connectives, up to 20m in di- 

 ameter, with normal and swollen sterigmata often appearing in the same 

 head; conidia globose or subglobose, rough, fairly dark-colored, 5 to 9.5m 

 in diameter; perithecia not found. (Species description after George 

 Smith.) 



