THE ASPERGILLUS GLAUCUS GROUP 141 



Neill in his study of the Aspergilli of New Zealand (1939) applied the 

 name A. caesiellus Saito (1904) to what was manifestly some strain near A. 

 conicus Blochwitz, and then placed the whole group in that species. 



A. restrictus G. Smith, in Jour. Text. Inst. 22: IT 15, fig. V. 1931. 

 Species characterization by George Smith 



Colonies growing very poorly on Czapek agar; growing moderately well 

 on wort agar, dark dull green, gradually turning grey or brownish -grey; 

 reverse in some cultures uncoloured, in others green to dark green ; surface 

 velvety at first, becoming wrinkled and often acquiring a warted appearance 

 (PI. IV A and fig. 36 B); heads forming long, compact, slender columns 

 (fig. 35 C) up to 350m by 20 to 30m in diameter; conidiophores arising mostly 

 from substratum but also as branches of aerial hyphae, commonly 50 

 to 100m, occasionally 150-200^ long by 3 to 3.5m in diameter, often with one 

 or two septa, smooth, sinuous, uncoloured; vesicles flask-shaped 7.5 to 14/i 

 in diameter; sterigmata in one series, borne on upper surface of vesicles 

 only, 6 to 9m by 2.5 to 3m (fig. 28 C); conidia rough, spinulose, elliptical or 

 somewhat pyriform, often showing a distinct connective, dark greenish- 

 brown, 4 to 6.5m by 3 to 4m, mostly 4.5 to 6m by 3 to 3.5m; perithecia not 

 found. The young conidia are hyaline and cylindrical and almost appear 

 to be segments of enormously elongated septate sterigmata. They 

 gradually swell without increasing in length, at the same time becoming 

 pigmented, but even in old heads they adhere strongly together in columns 

 of parallel chains ; and mounts (fig. 35 D) made in lactophenol usually show 

 compact, twisted, columnar masses of ripe conidia, both attached to and 

 separated from the heads. 



It is evident from Smith's discussion of a large accumulation of cultures, 

 especially from the textile industry, that the usual colony-type in his ex- 

 perience is not the "conicus" type with its slime but the columnar head 

 described as A. restrictus and accepted here as giving the most appropriate 

 name to the series. 



Among organisms belonging to this series, Smith isolated a single strain 

 which differed from typical A. restrictus in "showing somewhat larger di- 

 mensions throughout and, more particularly, in the production of conidia 

 up to 10 m or more in length," and to which he assigned the designation 

 Aspergillus restrictus var. B. (G. Smith, Jour. Text. Inst. 22: T115. Figs. 

 IV, VI, and VIII. 1931). Upon examination by us, this culture (NRRL 

 No. 148) was found to correspond fairly closely to his published description. 

 However, we do not believe it is sufficiently distinct to warrant continued 

 separation as a variety since other strains showing intermediate dimensions 

 arc encountered. 



