the root (no rank)
Eukaryota (domain)
Rhodophyta (phylum)
Bangiophyceae (class)
Porphyridiales (order)
Porphyridiaceae (family)
Porphyridium (genus)
[hide inferior taxa]
Porphyridium aerugineum (species)
Porphyridium cruentum (species)
Porphyridium purpureum (species)