Full reference: C. D. Walcott. 1919. Cambrian geology and paleontology. No. 5 – Middle Cambrian algae. Smithsonian Miscellaneous Collections 67:217-261

Parent taxon: Plantae according to C. D. Walcott 1919

Sister taxa: Aculeisporites, Alethopteridae, Asterotheca, Calamitaceae, Carpolithes, Coniferophyta, Cordaitales, Cyclogranisporites, Cymodoceites, Cyperites, Dutoitia, Embryophyta, Flabellofolium, Holcospermum, Howisonia, Knorria, Kraeuselisporites, Lapposisporites, Lepidodendraceae, Lonchopteris, Loperia, Lycopodiophyta, Lycopodophyta, Magnoliophyta, Metaleiofusa, Myeloxylon, Neuropteridae, Pachytesta, Pecopteris, Polysporangiophyta, Progymnospermophyta, Scythiana, Sigillariaceae, Spermatophyta, Sphenopteridae, Spheripollenites, Stigmaria, Sulcati, Tracheophyta, Trigonocarpus, Viridaeplantae, Wardia, Whittleseya

Subtaxa: none