Phylum:Ascomycota >> Class: Saccharomycetes >>  Order: Saccharomycetales 
 BCRC Number 22530     22531     22532      
 Scientific Name: Arthroascus fermentans

Arthroascus fermentans C.F. Lee et al., Int. J. Syst. Bacteriol. 44: 305. 1994.

 Description: Growth in 0.5% yeast extract-2% glucose broth: After 3 days at 25°C, the cells are ellipsoidal, long ovoidal and lemon shaped to elongate, (3.2-7.2) × (4.8-14.4) µm. Buds are formed on broad bases at the extremities of the cells. Sediment is formed after 1 month. Growth on YM agar: After 3 days at 25°C, septa develop between buds and parent cells. Short true hyphae or pseudomycelium form, which break up into arthrospores. All strains exhibited short lateral denticles. Growth on 5% malt extract agar: After 1 month at 25°C, the streak culture is creamy to brownish, butyrous, dull, flat, wrinkled and fringed with pseudomycelium. Dalmau plate culture on corn meal agar: After 10 days at 25°C, abundant pseudomycelium and true mycelium with phase-dark septa developed. Some elongate cells transformed into pouches usually containing 4 spores; the pouches (asci) become highly inflated in the middle. Formation of ascospores: Sporulation was observed on YM agar, potato dextrose agar, acetate agar, malt extract agar at 25°C after 3 days, as well as on Dalmau corn meal plate culture after 7 days. Cells can be transformed directly into asci or conjugation between two cells occurs and the zygote inflates in the middle, and is then transformed into a spindle-shaped ascus. Each ascus usually contains 4 spores, less frequently 2 spores, oblate-ovoidal with a narrow equatorial ledge and smooth surface. As soon as the asci mature, the spores are liberated and agglutinate together. All strains are homothallic.

Taiwan, Yilan: Soil from papaya orchard, 22 Jul 1991, BCRC 22530. Hualien: Soil from carambola orchard, 22 Jul 1991, BCRC 22531, BCRC 22532.

 Habitat: Soil.



Lee, CF et al. 1994.


F. L. Lee

 Note: This species is placed in biological safety level 1.