Belongs within: Cyanobacteriia.
Contains: Rivulariaceae, Nostocaceae, Stigonematales.
The Hormogoneae are a clade of filamentous blue-green algae including species in which one or more cells of trichomes differentiate into heterocysts.
Hormogoneae [Microchaetaceae, Microchaetoideae, Nostocales]
| i. s.: Petalonema alatumHB14, G64
| Hydrocoryne [incl. Hormothamnion]HB14
| StreptostemonHB14
| BorzinemaHB14
| SeguenzaeaHB14
| DactylothamnosHB14
| Archaeoellipsoides conjunctivus Zhang 1985TK06, EB93
|--+--RivulariaceaeHB14
| `--+--Chamaesiphon Braun & Grunow 1865SV13, C01 [Chamaesiphonales]
| | `--C. subglobosusSV13
| `--+--‘Leptolyngbya’ boryanaL02
| `--‘Leptolyngbya’ foveolarumL02
`--+--+--+--NostocaceaeHB14
| | `--+--‘Calothrix’ parietinaHB14
| | `--StigonematalesHB14
| `--FischerellaceaeHB14
| |--Westiellopsis prolificaHB14, SA07
| `--Fischerella Gomont 1895C01
| |--F. muscicolaHB14
| |--F. tenuisSA07
| `--F. thermalisC01
`--Scytonemataceae [Symphyonemataceae]HB14
| i. s.: Rhyniella vermiformis Croft & George 1959E93
| EpivalviaE93
| EncrustaE93
| BrachytrichiaHS14
| |--B. balaniPP64
| `--B. quoyi (Agardh) Bornet & Flahault 1886HS14
|--Mastigocladopsis repensHB14
`--+--+--*Iphinoe spelaeobiosHB14
| `--BrasilonemaHB14
| |--*B. bromeliaeHB14
| `--B. roberti-lamyiHB14
`--Scytonema Agardh 1824HB14, C01
|--*S. hofmanni Agardh ex Bornet & Flahault 1888C01
|--S. coactileSA07
|--S. hibernicumG64
|--S. julianumC01
|--S. myochrousG64
|--S. polycystumC01
|--S. rivulareSG05
`--S. stuposumC01*Type species of generic name indicated
References
[C01] Castenholz, R. W. 2001. Phylum BX. Cyanobacteria: oxygenic photosynthetic bacteria. In: Boone, D. R., R. W. Castenholz & G. M. Garrity (eds) Bergey’s Manual of Systematic Bacteriology 2nd ed. vol. 1. The Archaea and the Deeply Branching and Phototrophic Bacteria pp. 473–599. Springer.
[E93] Edwards, D. 1993. Monera (bacteria, blue-green algae). In: Benton, M. J. (ed.) The Fossil Record 2 pp. 3–7. Chapman & Hall: London.
[EB93] Edwards, D., J. G. Baldauf, P. R. Brown, K. J. Dorning, M. Feist, L. T. Gallagher, N. Grambast-Fessard, M. B. Hart, A. J. Powell & R. Riding. 1993. ‘Algae’. In: Benton, M. J. (ed.) The Fossil Record 2 pp. 15–40. Chapman & Hall: London.
[G64] Gray, J. E. 1864. Handbook of British Water-weeds or Algae. R. Hardwicke: London.
[HB14] Hauer, T., M. Bohunická, J. R. Johansen, J. Mareš & E. Berrendero-Gomez. 2014. Reassessment of the cyanobacterial family Microchaetaceae and establishment of new families Tolypothrichaceae and Godleyaceae. Journal of Phycology 50: 1089–1100.
[HS14] Huisman, J. M., & A. Sampey. 2014. Kimberley marine biota. Historical data: marine plants. Records of the Western Australian Museum Supplement 84: 45–67.
[L02] Litvaitis, M. K. 2002. A molecular test of cyanobacterial phylogeny: inferences from constraint analyses. Hydrobiologia 468: 135–145.
[PP64] Peres, J. M., & J. Picard. 1964. Nouveau manuel de bionomie benthique de la mer Mediterranee. Recueil des Travaux de la Station Marine d’Endoume, Bulletin 31 (27): 5–137.
[SA07] Samad, L. K., & S. P. Adhikary. 2007. Cyanobacteria from two prehistoric caves of India. Bulletin of the Botanical Survey of India 49: 191–194.
[SG05] Sau, A., & R. K. Gupta. 2005. Algal flora of Indian Botanic Garden, Howrah, West Bengal. Bulletin of the Botanical Survey of India 47: 63–86.
[SV13] Schirrmeister, B. E., J. M. de Vos, A. Antonelli & H. C. Bagheri. 2013. Evolution of multicellularity coincided with increased diversification of cyanobacteria and the Great Oxidation Event. Proceedings of the National Academy of Sciences of the USA 110 (5): 1791–1796.
[TK06] Tomitani, A., A. H. Knoll, C. M. Cavanaugh & T. Ohno. 2006. The evolutionary diversification of cyanobacteria: molecular-phylogenetic and paleontological perspectives. Proceedings of the National Academy of Sciences of the USA 103: 5442–5447.