Name: Nostocophyceae Christensen 1978

Category: Class

Proposed as: class. nov.

Etymology: Nos.to.co.phy’ce.ae. N.L. fem. pl. n. Nostocophyceae, the Nostoc class

Pronunciation (Latin), gender: nos-to-ko-P^HY-ke-a͡e, feminine

Type genus: Nostoc Vaucher ex Bornet and Flahault 1886

Valid publication: Christensen T. Annotations to a textbook of phycology. Bot. Tidsskr. 1978; 73:65-70.

Nomenclatural status: validly published under the ICN (Botanical Code)

Taxonomic status: synonym

Correct name: Chroococcophyceae Hollerbach et al. 1953

• Synonyms:

  • Name	Kind
    "Chroococcophyceae" Wartenberg 1972	heterotypic synonym, not validly published
    "Chroococcophyceae" Proshkina-Lavrenko and Makarova 1968	heterotypic synonym, not validly published
    "Chroococcophyceae" Starmach 1966	heterotypic synonym, not validly published
    Cyanophycoidea Walton 1931	heterotypic synonym, validly published under the ICN (Botanical Code), descriptive name
    Cyanophyceae Schaffner 1909	heterotypic synonym, validly published under the ICN (Botanical Code), illegitimate name, later homonym
    Cyanophyceae Bennett and Murray 1889	heterotypic synonym, validly published under the ICN (Botanical Code), illegitimate name, later homonym
    Cyanophyceae Hauck 1885	heterotypic synonym, validly published under the ICN (Botanical Code), descriptive name
    Oxyphotobacteria (ex Gibbons and Murray 1978) Murray 1988	heterotypic synonym, validly published under the ICNP, rejected name
    Gloeobacteria Cavalier-Smith 2002	heterotypic synonym, validly published under the ICNP, rejected name
    Chroobacteria Cavalier-Smith 2002	heterotypic synonym, validly published under the ICNP, rejected name
    Chamaesiphonophyceae Hollerbach et al. 1953	heterotypic synonym, validly published under the ICN (Botanical Code)
    Chroococcophyceae Hollerbach et al. 1953	heterotypic synonym, validly published under the ICN (Botanical Code)
    "Prochlorophyceae" Lewin 1977	heterotypic synonym, not validly published
    Chamaesiphonophyceae Starmach 1966	heterotypic synonym, validly published under the ICN (Botanical Code), illegitimate name
    Hormogoneae Cavalier-Smith 2002	heterotypic synonym, validly published under the ICNP, rejected name, later homonym
    "Pleurocapsophyceae" Starmach 1966	heterotypic synonym, not validly published

• Notes:
  • 🧒 Christensen (1978) assigned the genus Nostoc Vaucher ex Bornet and Flahault 1886 to this class. Publication: Christensen T. Annotations to a textbook of phycology. Botanisk Tidsskrift 1978; 73:65-70.
  • 🚃 The type genus of this class has alternatively been placed in the class Schizophyceae Knoblauch 1890. Publication: Warming E. Handbuch der systematischen Botanik. Deutsche Ausgabe von Dr. Emil Knoblauch. Unknown Publisher, Berlin, 1890.
  • 🚃 The type genus of this class has alternatively been placed in the class "Cyanobacteria". Publication: Garrity GM, Holt JG. The Road Map to the Manual. In: Boone DR, Castenholz RW, Garrity GM (eds), Bergey's Manual of Systematic Bacteriology, second edition, vol. 1 (The Archaea and the deeply branching and phototrophic Bacteria), Springer-Verlag, New York, 2001, p. 119-166. 🇺🇸
  • 🙄 This taxon name is occasionally misprinted (or affected by an OCR error) in some sources as: "Nostochophyceae".
  • ❗ Nostocophyceae is the correct name instead if this class is regarded as a separate class (i.e., if its nomenclatural type is not assigned to another class whose name is validly published, legitimate and not rejected and has priority).
  • 🧍 According to Silva (1980) this name is, as circumscribed in the Index Nominum Genericorum, equivalent to Cyanophyceae. Publication: Silva PC. Names of classes and families of living algae with special reference to their use in the Index Nominum Genericorum (Plantarum). Bohn, Scheltema & Holkema, Utrecht, 1980.

Parent taxon: Cyanobacteriota Oren et al. 2022

Assigned by: LPSN automated production system. The following publication is only one of the sources consulted. It may or may not mention this taxon name. — Aleksovski B, Krstić S, Guiry MD. The names of phyla and classes of blue-green algae (cyanobacteria, cyanophytes) and a typified name: Cyanobacteriophyta Oren, Mareš et Rippka. Fottea 2025; 25:212-217. 🇮🇪

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Record number: 6074