Phylum:Ascomycota >> Class: Ascomycetes >>  Order: Eurotiales 
 BCRC Number NO BCRC Number!  
 Scientific Name: Thermoascus aurantiacus

Thermoascus aurantiacus Miehe, Die Selbsterhitzung des Heues p.70-73. 1907.

 Description: Colonies on PDA growing very rapidly, covering the plate at 40°C in 3 days, with erect white hyphae and granule-like ascomata, reverse Dark Mare Brown. Ascomata single or in groups forming a crust, first white, then turning to yellow, orange, orange brown and dark liver brown, subglobose, ovoid or irregular in shape, 280-560 × 370-672 μm. Asci globose, Subglobose or ovoid, 8-11 × 10.6-14 μm with 4-8 ascospores irregularly arranged. Acospores elliptical, slightly roughened, 4-4.2 × 4.2-7 μm .No asexual structure has bee observed in our isolates.

Taiwan: Taipei, Tangsui Cheng , low land cultivated soil of turnips. 20. IV. 1984. K-Y Chen 8404-4. Pingtung Hsine, Kueilai Hsiang, low land paddy soil, 10 VIII. 1986. K-Y Chen 8608-28.

 Habitat: Cultivated soil of turnips.

Australian, England, Japan, Netherlands, Saudi Arabia, Taiwan


Chen, GY and Chen, ZC. 1988; Cooney, DG and Emerson, R. 1964; Stolk, AC. 1965.


K. Y. Chen

 Note: Temperature tests: Growth was very fast at 40°C and 50°C. No growth occurred at 30°C in 6 days. Ascomata were produced very abundantly at 40°C and 50°C. Although Cooney & Emerson (1964) described the conidial structure of T. aurantiacus as Paecilomyces-like, no asexual structure has been observed in our isolates. Other morphological characters of our isolates are identical to the descriptions of this species reported by Awo and Otsuka (1973).