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R. setigera: valve apex, transitional to var. pungens
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R. setigera: valve apex of var. setigera (SEM)
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R. setigera: individual girdle band (TEM)
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R. setigera: girdle bands in two dorsiventral columns
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R. setigera: one spine typical of var. setigera; other spine transitional to var. pungens
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R. setigera fully-formed resting spore pair in parent cell
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R. setigera bloom: var setigera + var. pungens; diameters 6-9µm
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