Genus:
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Similar species -->> Microthamnion;
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