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P. caldarium 3-6 μm hot-spring Sukawa highland Kurikoma mountain Iwate, 2005

P. caldarium 2-5 μm hot-spring Sukawa highland Kurikoma mountain Iwate, 2007

P. caldarium 4 μm Jigoku-numa Hakkoda mountain Aomori, 2006

Similar species -->> Microthamnion;

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