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Literature:
 
Page number:521 
Remarks (internal):Type WB 201 (Thom No. 4138-N8) was isolated from New Jersey soil and has been kept in culture since 1916. Other strains examined include isolations from Texas, Colorado, Louisiana, and Maryland.
A strain in our collection received from George Smith in 1951, WB 4992, shows some ascospores with four very much reduced crests and others in which there is almost no trace of such ornamentation. This isolate suggests a possible close relationship between A. nidulans var. acristatus and A. quadrilineatus.
 
Description type:Non-original description 
Description:Aspergillus quadrilineatus Thom and Raper, in Mycologia 31: 660 (1939). Ascosporic stage reported also as
Emericella quadrilineata (Thom and Raper) Benjamin, in Mycologia 47(5): 680 (1955).
Colonies on Czapek's solution agar spreading, plane or slightly wrinkled, with tendency toward floccosity in some strains, in others with submerged mycelium dark purple-brown extending beyond the area of surface growth in a lobed or fimbriate pattern, central surface area gray with a definite purplish tinge, and olive green conidial areas toward the margin, occasion-ally as sectors; cleistothecia developing separately but abundantly through-out the colony; reverse purplish red to purple-brown; conidial heads short columnar, green, mostly 60 to 70 µm by 30 to 35 µm occasionally larger or smaller; conidiophores sinuate, smooth walled, dull brownish in color, 50 to 75 µm in length by 3.5 to 4.5 µm wide, broadening to 7.5 to 9 µm at the hemi­spherical vesicular areas; sterigmata in two series, primary sterigmata 5 to 6 µm by 2 to 3 µm, secondary sterigmata 5 to 7 µm by 2. to 2.5 µm; conidia globose, pale yellow-green, rugulose, 3 to 4 µm in diameter; cleistothecia enveloped by hülle cells, light brownish in color, spherical, partially embedded in the mycelial felt (Fig. 109D), about 125 to 150 µm in diameter including the enveloping hülle cell layer, with cleistothecial wall one cell layer thick, ripening quickly with ripe asci breaking down to leave the ascospores free; ascospores purple-red, lenticular, smooth walled, with spore body 4.0 to 4.8 µm by 3.4 to 3.8 µm and with two pleated equatorial crests about 0.5 µm in width paralleled by a secondary narrower pair (Fig. 113B) which are sometimes indistinct.
 
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