THE ASPERGILLUS NIDULANS GROUP 



169 



Aspergillus unguis (Emile-Weil and Gaudin) Emend. Thorn and Raper, 



Myc. 31, p. 667, fig. 6. 1939. 



Synonyms: Sterigmatocystis unguis Emile-Weil and Gaudin, Arch. Med. 

 Expt. Anal. Path. Paris 28: 463-465, fig. 4, 1919. 

 A. loakiashanensis Shih, Lingnan Sci. Jour. 15 (3): 369. p. 

 16, fig. 2. 1936. 



Colonies on Czapek's solution agar restrictedly growing, plane, spreading 

 at the margin as irregular lobes (fig. 41 E), yellowish-green, green to dark 

 green becoming brown in age; without perithecia or hulle cells. Mycelial 

 preparations show striking sterile, thick-walled hyphae with walls in brown 



Fig. -46. Sterile spicule hyphae of Aspergillus unguis. A, Cluster of sterile 

 hyphae, X 370. B, Apex of sterile hypha, X 740. C and D, Mid-portions of sterile 

 hyphae showing thick roughened walls, X 740. (Reprinted from Thorn and Raper, 

 "The Aspergillus nidulans Group," Alycologia 31: 653-669. 1939.) 



shades, irregularly roughened (fig. 46), tapering to a blunt point, arising 

 sometimes from foot-cells suggesting the origin of conidiophores, sometimes 

 apparently from mycelial cells, often up to 1,000m or more in length, slant- 

 ing upward but usually rising only slightly above the conidial area (fig. 

 42 B). 



Conidial heads columnar, 75 to 150m by 40 to 50m; conidiophores smooth- 

 walled, dull brown in color, mostly 45 to 65m in length by 3 to 5m in diameter, 

 enlarging to vesicular hemispheres 9 to 12m in diameter; primary sterigmata 

 5 to 6m by 2.5 to 3m, secondary sterigmata 5 to 6m by 2 to 2.5m; conidia 

 globose, rugulose, dull green, 2.5 to 3.5m in diameter. 



Cultures of A. unguis are obtained frequently from medical laboratoies 

 apparently as more or less active pathogens but occasionally isolated from 



