Sirosiphon compactus (Agardh) Kütz. Dataset United Kingdom Species Inventory (UKSI) Rank SPECIES Classification phylum Cyanobacteria class Cyanophyceae order Nostocales family Scytonemataceae genus Scytonema Name Homonyms Sirosiphon compactus (C.Agardh) Kütz. Sirosiphon compactus (C.Agardh) Kütz. Sirosiphon compactus (Agardh) Kütz.