THE ASPERGILLUS OCHRACEUS GROUP 283 



Conidiophore 50 to 70m in diameter, 10 mm. or more long with walls 7 to 

 12/x thick. Surface ragged and more or less pitted. Vesicle up to 175m 

 in diameter with walls 7m thick, marked with a deep pit for each sterigma. 

 Sterigmata, primary 50 to 90m, at times 120 by 8 to 10m at the outer end, 

 sometimes with one cross wall; secondary 15 to 25m by 3 to 4m, clustered on 

 the apex of the primary. Occasionally with a sterile cell interposed between 

 secondaries and primaries. Conidia 8 to 12m by 5 to 8m, elliptical, pitted, 

 yellowish. 



Gigantic forms such as this occasionally appear under field conditions, 

 hence reach fungus herbaria. Whether these are really different from some 

 of the usual species can only be determined by collection and laboratory 

 cultivation. Until such study has been made, such forms as A. penicil- 

 lopsis must be questioned. 



Aspergillus ostianus Wehmer, in Bot. Centralb. 80: 449-461. 1899; also 

 Monogr. pps. 117-119, Taf. II, No. 1. 1899-1901. 



Colonies upon Czapek's solution agar growing fairly well, producing a 

 surface growth of crowded conidiophores and conidial heads in yellowish 

 to ochraceous shades, passing to shades of cinnamon in very old cultures 

 with reddish-brown colors in reverse (Wehmer reported rusty-yellow, pale 

 to deep brownish-yellow to cinnamon). Conidial heads globose, up to 

 200m in diameter. Conidiophores yellow, coarsely roughened, mostly 500 

 to 700m long in crowded areas, becoming 1 to 2 mm. in margins of old 

 colonies and usually 7 to 10m in diameter, with walls heavy, up to 2 or 2.5m 

 in thickness. Vesicles commonly globose, about 40m m diameter, oc- 

 casionally much larger up to 70m, hi growing heads thin-walled, colorless, 

 crushing easily, leaving the funnel-like yellow tip of the conidiophore open. 

 Sterigmata in two series: primary from 15 to 20m long in smaller heads 

 to 35m by about 8m at the tip in large heads, secondary 10 to 13m by about 

 3m- Conidia commonly 3 to 4m or even 5m in long axis, varying from pyri- 

 forrrj to elliptical, or at times subglobose, rough. Sclerotia occasionally 

 present but not conspicuous. 



This diagnosis was based upon Wehmer 's description, and is reasonably 

 well represented by strain NRRL No. 420 (Thorn No. 4724.35) received 

 from Raistrick in 1924 and reported by him to have come from Westerdijk 

 as Wehmer 's original strain. With conspicuous appearances suggesting 

 relationship to the A. ochraceus group, the shape and ultimate color of the 

 ripe spores suggest a border line position between A. ochraceus and A. 

 tamarii. 



Aspergillus sparsus Raper and Thorn, in Mycologia 36: 572-574, 



fig. 6. 1944. 



Colonies upon Czapek's solution agar at room temperature spreading 

 broadly, dull grayish-brown in color, at first largely submerged, but later 



