Stigonematales
Encyclopedia
Stigonematales is the order
Order (biology)
In scientific classification used in biology, the order is# a taxonomic rank used in the classification of organisms. Other well-known ranks are life, domain, kingdom, phylum, class, family, genus, and species, with order fitting in between class and family...

 of cyanobacteria that includes filamentous strains that produce hormogonia
Hormogonium
Hormogonia are motile filaments of cells formed by some cyanobacteria in the family Nostoceae. They are formed during asexual reproduction in unicellular, filamentous cyanobacteria some contain heterocysts and akinetes....

 and exhibit true branching. Under the more recent classification system devised by Rippka et al., these strains are listed under section V http://www-cyanosite.bio.purdue.edu/taxon79.html.
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