Aspergillus ruber Thom & Church 1926

Diospyros melanoxylon; Homo sapiens; Leguminosae sp.; Oryza sativa; Plantae sp.; Triticum sp.; Zea mays.

Brazil (Maranhão, São Paulo); British Isles; Egypt; Eire; former USSR; Guatemala; India (Andhra Pradesh, Madhya Pradesh); New Zealand; UK; USA (Washington); Venezuela.

Colonies. On CYA 10-20 mm diam., plane, deep, usually dense and velutinous, sometimes floccose; mycelium yellow to bright orange; conidiophores and developing cleistothecia usually present, but often poorly formed; reverse pale yellow to orange brown; on MEA usually 10-20 mm diam., sometimes only 5-8 mm, similar to those on CYA, but sometimes less deep and with more conspicuous orange hyphae; on G25N 30-45 mm diam., plane, often floccose and with hyphal strands sometimes reaching the Petri dish lid, consisting of cleistothecia in layers supported and surrounded by relatively sparse orange to dark orange hyphae; conidial heads usually rare, above or within the cleistothecial layer, dull green; reverse yellow, brown or reddish orange; on CYA at 5 or 37°C, no growth; on CY20S at 7 days 35-60 mm diam., plane or lightly sulcate, usually low, dense and velutinous; mycelium conspicuous, at the margins yellow, becoming orange or more reddish elsewhere, enveloping abundant yellow cleistothecia and surmounted by sparse to abundant dull green heads; reverse in colours similar to the mycelium, though rarely so bright, or deep yellow brown; in age, 10 days or more, developing bright to brick red brown hyphal colours over the whole plate or in patches, not under densely conidial areas or, rarely, remaining orange; reverse darkening over time to deep brown or almost black. Conidiophores. Borne from aerial hyphae, stipes mostly 300-700 μm long, terminating in spherical vesicles, 20-35 mm wide, fertile over the upper two-thirds, bearing conidiogenous cells only. Conidiogenous cells. 7-9 μm long. Conidia. Subspheroidal to ellipsoidal, less commonly spherical or pyriform, generally 6-7 μm long, larger in occasional isolates, with spinose walls, borne in loosely radiate heads. Ascomata. Cleistothecial, on CY20S or G25N borne from and enveloped in sterile orange to red hyphae, spherical, yellow, 80-150 μm diam., maturing in 9-12 days. Asci. Not noted. Ascospores. Ellipsoidal, yellow, 5.0-6.0 μm long, with a shallow longitudinal furrow flanked by low, usually minutely roughened ridges, otherwise with smooth walls.

Aspergillus ruber is a species of fungus in the genus Aspergillus. It is from the Aspergillus section. The species was first described in 1929. It has been isolated from coffee beans in the UK, tea and soil in China, and malt dust in the Czech Republic. It has been reported to produce auroglaucin, bisanthrons, catenarin, dihydroauroglaucin, echinulins, epiheveadrides, erythroglaucin, flavoglaucin, isoechinulins, neoechinulins, physcion, questin, questinol, tetracyclic, and tetrahydroauroglaucin.