Hedstroemia
Encyclopedia
The extinct genus Hedstroemia is thought to be a rivulariacean cyanobacterium. It occurs in conjunction with Solenopora
Solenopora
The extinct Solenoporaceae have traditionally been interpreted as a group of red algae ancestral to the Corallinales.The genus from which they take their name, Solenopora, originates in the Ordovician...

. It forms oval blobs composed of sinuous tubes that have rounded outlines.
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