The extinct genus ''Hedstroemia'' was once thought to be a
rivulariacean cyanobacterium. It forms oval blobs composed of sinuous tubes that have rounded outlines and occurs in conjunction with ''
Solenopora''.
''Hedstroemia'' was formerly assigned to the now obsolete taxon
porostromata
"Porostromata" is an antiquated form taxon that refers to fossil cyanobacteria. The term porostromate is also used as a descriptor of textures and microstructure of stromatolites and oncolites which contain tubules or other cellular structures.
...
.
In 2020, the genus was assigned to the cyanobacteria order
Nostocales
The Nostocales are an order of cyanobacteria containing most of its species. It includes filamentous forms, both simple or branched, and both those occurring as single strands or multiple strands within a sheath. Some members show a decrease in ...
.
References
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Ulvophyceae genera
Bryopsidales
{{Ulvophyceae-stub