Lagerheimia
Scientific classification Edit this classification
(unranked): Viridiplantae
Division: Chlorophyta
Class: Trebouxiophyceae
Order: Chlorellales
Family: Oocystaceae
Genus: Lagerheimia
Chodat
Species
  • Lagerheimia genevensis

Lagerheimia is a genus of green algae in the family Oocystaceae.[1] It is commonly found in freshwater habitats all over the world,[2] although some species are rare and have only been recorded from Europe or the United States.[3]

The genus name of Lagerheimia is in honour of Nils Gustaf Lagerheim (1860–1926), who was a Swedish botanist, mycologist, phycologist, and pteridologist.[4]

The genus was circumscribed by Giovanni Battista De Toni and Robert Hippolyte Chodat in Nuova Notarisia vol.6 on page 86-90 in 1895.

Description

Lagerheimia consists of solitary cells. Cells are spherical, ellipsoidal, ovoid, polyhedral, or citriform (lemon-shaped), with one to several spines at the poles; some species also have spines at the equators. A layer of mucilage around the cell may be present. Cells contain a parietal chloroplast with one pyrenoid.[3]

Species identification is based on the shape of the cells, placement and length of the spines, and presence or absence of tubercles at the base of the spines.[3] Species with tubercles at the base of their spines have been classified in a separate genus, called Chodatella; however, modern authors do not recognize this split.[3][5] The genus is similar to Franceia, which has spines distributed all over the cell surface.[3] It may also be confused with single-celled forms of Desmodesmus, a genus that usually has coenobia of four or eight cells.[6]

Reproduction

Lagerheimia reproduces asexually by zoospores or autospores. Zoospores have two flagella. When reproducing with autospores, 2, 4, or 8 are formed within the mother cell and are released when the mother cell wall ruptures. Reports of sexual reproduction have not been confirmed.[3]

Taxonomy

Lagerheimia is placed in the family Oocystaceae. The cell wall ultrastructure of Lagerheimia subsalsa is similar to that of some species of Oocystis, and consists of several layers of microfibrils. Microfibrils are perpendicular from one layer to the next.[3]

Because Lagerheimia appears similar to one-celled forms of Desmodesmus, some authors have doubted the validity of this genus.[2] However, Lagerheimia strains are phylogenetically placed within the class Trebouxiophyceae.[7] In its current circumscription, Lagerheimia is polyphyletic: some species are more closely related to Franceia than to other Lagerheimia species.[7]

References

  1. ↑ See the NCBI webpage on Lagerheimia. Data extracted from the "NCBI taxonomy resources". National Center for Biotechnology Information. Retrieved 2007-03-19.
  2. 1 2 Bicudo, Carlos E. M.; Menezes, Mariângela (2006). Gêneros de Algas de Águas Continentais do Brasil: chave para identificação e descrições (2 ed.). RiMa Editora. p. 508. ISBN 857656064X.
  3. 1 2 3 4 5 6 7 Hindák, F. (1983). "Review of the genus Lagerheimia Chod. incl. Chodatella Lemm. (Chlorococcales, Chlorophyceae)". Schweizerische Zeitschrift für Hydrologie. 45 (2): 373–387. doi:10.1007/BF02538127. S2CID 19485442.
  4. ↑ Burkhardt, Lotte (2022). Eine Enzyklopädie zu eponymischen Pflanzennamen [Encyclopedia of eponymic plant names] (pdf) (in German). Berlin: Botanic Garden and Botanical Museum, Freie Universität Berlin. doi:10.3372/epolist2022. ISBN 978-3-946292-41-8. S2CID 246307410. Retrieved January 27, 2022.
  5. ↑ Guiry, M.D.; Guiry, G.M. "Chodatella". AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. Retrieved 2023-05-12.
  6. ↑ Matthews, Robin A. (2016). "Freshwater Algae in Northwest Washington, Volume II, Chlorophyta and Rhodophyta". A Collection of Open Access Books and Monographs. Western Washington University. doi:10.25710/fctx-n773.
  7. 1 2 Štenclová, Lenka; Fučíková, Karolina; Kaštovský, Jan; Pažoutová, Marie (2017). "Molecular and morphological delimitation and generic classification of the family Oocystaceae (Trebouxiophyceae, Chlorophyta)". Journal of Phycology. 53 (6): 1263–1282. doi:10.1111/jpy.12581. PMID 28833138. S2CID 21278460.
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