This genus has four members. Two of them, S.s.s. and S.s.n., are important pathogens on vegetables.
Sporosorus usually spongy, often hollow, or with numerous irregular channels and openings. Size 19-85 µm (most 40-80). Color: hyaline to yellow, brown and green. A sporosorus consists of 500-1000 single spores. Single resting spores: 3.5-4.5 µm diam. A host cell contains often more than one sporosorus. Primary and secondary zoospores: heterocont biflagellated, 2.5-4.6 µm diam. Zoosporangia small, ovoid or spherical, or large, elongate, lobed and irregular, single , or united loosely in sporangiosori. Each compartment contains an even number of secondary zoospores. Parasitic in Solanacea.
Sporosorus somewhat spongy, often hollow with numerous irregular channels and openings. Size 12-82 µm. Color: yellowish-brown. Single resting spores: 3.6-4.5 µm diam. Sporosori conforming usually in size and shape to those of host cell. Primary zoospore: size unknown. Secondary zoospore: heterocont biflagelated, 2.4-6.0 µm diam. Zoosporangia small, ovoid, spherical od polyhedral, mostly united in sporangiosori. Parsitic in Nasturtium.
Sporosorus irregular or globular or elongate, with large irregular channels. Size 25-50µm. Color: unknown. Single resting spores: 4-5.5 µm diam., with fairly thick and slightly verrucose walls. Zoospores and zoosporangia: unknown. Parasitic in Campanula.
Sporosorus almost rectangular to cubical and irregular in outline with hollow cavities of various sizes and shapes. Size: 47-72 µm. Color: yellowish. A sporosorus consists of up to 100 or more single spores. Single resting spores: size unknown, with a thick wall. Sporosori conforming usually in size and shape to those of host cell. Primary and secondary zoospores: heterocont biflagelated, 3.5-4 µm diam. Zoosporangia globose to slightly irregular, thinwalled, loosely united. Parasitic in Cotula.
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Phytopathology Group ETH Zurich / Institute of Plant Sciences / ETH Zurich
Last update: April 2012