 Phylum：Oomycota >> Class： Oomycetes >> Order： Saprolegniales |
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 BCRC Number： |
NO BCRC Number! | |||
| Scientific Name： |
Achlya ambisexualis | |||
| Author： |
Achlya ambisexualis Raper. Amer. J. Bot. 26: 639. 1939. |
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| Description： |
Plant dioecious. Mycelium of oogonial thallus extensively dense; principal hyphae stout,40-60μin diameter at base. Gemmae abundant, spherical, filiform, often irregular; terminal single or catenulate; zoosporangia abundant; clavate or fusiform; 500 × 60 μ; renewed sympodially.Mycelium of antheridial thallus extensive diffuse, slender. Oogonia abundant; lateral or terminal rarely intercalary; spherical, infrequently pyriform; 32-80 μ in diameter, predominantly50-65 μ. Oogonial stalk 1/4-3 times the diameter of oogonia in length, usually 1/2-3/2times; stout, tapering toward base; straight. Antheridial branches long, profusely branched;irregular; wrapping about the oogonium and sometimes attendant hyphae. Antheridial cell tubularor clavate; attached by projections or laterally appressed. Fertilization tube not observed.Oospheres maturing. Oospores eccentric; spherical; filling the oogonium; 1-20 in number usually 7-14; 18-30 μ in diameter, predominantly 20-25 μ, Germination not observed. | |||
| Specimens： |
Collected three from soil samples. (Nov. 4, 1974. Nankang, Taipei; rice field) |
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| Habitat： |
Soil and water | |||
| Distribution： |
Taiwan, USA, UK |
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| References： |
Barksdalem AW. 1965; Dick MW. 1960; Raper JH. 1939. |
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| Provided： |
T. S. Chiou and H. S. Chang |
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| Note： |
A, ambisexualis has been isolated from the paddy soil in Nankang, Taipei several times. The isolates from the initial habitats can produce sexual reproductive structures, in stead the single hyphal tip isolates from the original cultures cannot. However, the sexual stages can be restored after the mating of compatible isolates. | |||