Lagerheimia

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Lagerheimia
Lagerheimia EPA.jpg
Scientific classification OOjs UI icon edit-ltr.svg
Clade: Viridiplantae
Division: Chlorophyta
Class: Trebouxiophyceae
Order: Chlorellales
Family: Oocystaceae
Genus: Lagerheimia
Chodat
Type species
Lagerheimia genevensis
Chodat [1]
Species

Lagerheimia is a genus of green algae in the family Oocystaceae. [2] It is commonly found in freshwater habitats all over the world, [3] although some species are rare and have only been recorded from Europe or the United States. [4]

Contents

The genus name of Lagerheimia is in honour of Nils Gustaf Lagerheim (1860–1926), who was a Swedish botanist, mycologist, phycologist, and pteridologist. [5]

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. [4]

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. [4] 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. [4] [6] The genus is similar to Franceia , which has spines distributed all over the cell surface. [4] It may also be confused with single-celled forms of Desmodesmus , a genus that usually has coenobia of four or eight cells. [7]

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. [4]

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. [4]

Because Lagerheimia appears similar to one-celled forms of Desmodesmus, some authors have doubted the validity of this genus. [3] However, Lagerheimia strains are phylogenetically placed within the class Trebouxiophyceae. [8] In its current circumscription, Lagerheimia is polyphyletic: some species are more closely related to Franceia than to other Lagerheimia species. [8]

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References

  1. ↑ Guiry, M.D.; Guiry, G.M. "Lagerheimia". AlgaeBase . World-wide electronic publication, National University of Ireland, Galway. Retrieved 2024-11-29.
  2. ↑ See the NCBI webpage on Lagerheimia. Data extracted from the "NCBI taxonomy resources". National Center for Biotechnology Information . Retrieved 2007-03-19.
  3. 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.
  4. 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.
  5. ↑ 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.
  6. ↑ Guiry, M.D.; Guiry, G.M. "Chodatella". AlgaeBase . World-wide electronic publication, National University of Ireland, Galway. Retrieved 2023-05-12.
  7. ↑ 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.
  8. 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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