Isoetes macrospora

Taxonavigation

Taxonavigation: Isoetales
Superregnum: Eukaryota Cladus: Orthokaryota Cladus: Neokaryota Cladus: Photokaryota Cladus: Diaphoretickes Cladus: CAM Regnum*: Archaeplastida Regnum: Plantae Regnum*: Viridiplantae Cladus: Streptophyta Cladus: Phragmoplastophyta Cladus: Embryophyta Cladus: Polysporangiophyta Divisio*: Tracheophyta Divisio: Lycopodiophyta Classis: Lycopodiopsida Subclassis: Isoetidae Ordo: Isoetales

Familia: Isoetaceae
Genus: Isoetes
Species: Isoetes lacustris

Name

Isoetes macrospora Durieu, Bull. Soc. Bot. France 11: 101 (1864).

• Typus: un lac des Catskill mountains, New York, Anonymus

Synonyms

• Homotypic
  • Isoetes lacustris subsp. macrospora (Durieu) D.F.Brunt. & Kartesz, Consp. North Amer. Isoet. 1: 46 (2025).
• Heterotypic
  • Isoetes hieroglyphica A.A.Eaton, Fernwort Papers 10 (1900).
    • Typus: St. Francis lakes, between Maine and Canada, 31.7.1880, Pringle (MO, GH, NY, US 01100845, WIS 0000069)
    • Isoetes macrospora f. hieroglyphica (A.A.Eaton) N.Pfeiff., Ann. Missouri Bot. Gard. 9: 194 (1922).
    • Isoetes lacustris subsp. hieroglyphica (A.A.Eaton) W.C.Taylor & Luebke

Hybrids

I. × fairbrothersii – I. × harveyi – I. × hickeyi – I. × jeffreyi

Distribution

Native distribution areas:

Continental: Northern America Regional: Subarctic America Northern Territories. Regional: Western Canada Manitoba, Saskatchewan. Regional: Eastern Canada New Brunswick, Newfoundland (Newfoundland (continental), St.-Pierre-et-Miquelon), Nova Scotia, Ontario, Prince Edward Isle, Québec. Regional: North-Central U.S.A. Minnesota, Wisconsin. Regional: Northeastern U.S.A. Connecticut, Maine, Massachusetts, Michigan, New Hampshire, New York, Rhode Island, Vermont. Regional: Southeastern U.S.A. Tennessee, Virginia. References: Brummitt, R.K. 2001. TDWG – World Geographical Scheme for Recording Plant Distributions, 2nd Edition

References

Primary references

• Durieu de Maisonneuve, M.C. 1864. Notes sur quelques espèces nouvelles d'Isoetes de l'Amérique du Nord et de l'Australie. Bulletin de la Société Botanique de France 11(4): 100–105. DOI: 10.1080/00378941.1864.10827321 BHL Reference page. 

Additional references

• Pfeiffer, N.E. 1922. Monograph of the Isoetaceae. Annals of the Missouri Botanical Garden 9(2): 79–218, pls. xii–xix. JSTOR, BHL Reference page. 

Links

• Govaerts, R. et al. 2026. Isoetes macrospora in Kew Science Plants of the World Online. The Board of Trustees of the Royal Botanic Gardens, Kew. Published online. Accessed: 2026 Jun 9. Reference page. 
• Tropicos.org 2026. Isoetes macrospora. Missouri Botanical Garden. Published online. Accessed: 9 Jun 2026. Reference page.
• International Plant Names Index. 2026. Isoetes macrospora. Published online. Accessed: 9 Jun 2026. Reference page.
• Hassler, M. 2026. World Ferns. Checklist of Ferns and Lycophytes of the World. . Isoetes macrospora Accessed: 9 Jun 2026. Reference page.
• USDA NRCS PLANTS Profile [ISLA & ISMA]

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