Phylum:Oomycota >> Class: Oomycetes >> Order: Saprolegniales | ||||
BCRC Number: | NO BCRC Number! | |||
Scientific Name: | Achlya americana | |||
Author: | Achlya americana Humphrey Trans. Amer. Phil. Soc.(N. S.)17:116. 1893. |
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Description: | Mycelium extensive diffuse; principal hyphae stout, 75-150 μ in diameter at base. Gemmae abundant;filiform or fusiform, irregular; terminal single, intercalary or catenulate; zoosporangia aboundant; navivulate , filiform or fusiform; straight or curved; 200-980 μ long by 15-60 μ in diameter, renewed sympodially. Zoospore discharge achlyoid; spore cluster persistent at exit pore; encysted spores 9-10 μ. Oogonia abundant; lateral, occasionally terminal; spheriacal, infrequently pyriform, oval; 35-97 μ in diamenter, predominantly 55-70 μ. Oogonial wall pitted, smooth. Oogonial stalks 1/2-2 times the diameter of the oogonia; straight, rarely curved or bent. Antheridial branches monoclinous, rarely diclinus; almost arising near stalk; simple; attached by projections, rarely laterally appressed; fertilization tubes present. Oospores eccentric; spherical; filling the oogonium;1-38 in number, generally 6-14; 20-44 μ in diameter, generally 20-24 μ. | |||
Specimens: | Taiwan, Taipei County: Sansia Township, 1995, NTUPPWM-0036. |
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Habitat: | soil and fresh water of rice field. | |||
Distribution: | Taiwan, North America. |
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References: | Chiou, T. S. and Chang, H. S. 1976. |
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Provided: | C. H. Fu |
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Note: | null | |||