Pseudopediastrum

Pseudopediastrum is a genus of green algae in the family Hydrodictyaceae.[1] It is very common in freshwater regions throughout the world.[2]

Pseudopediastrum
Pseudopediastrum boryanum
Scientific classification Edit this classification
(unranked): Viridiplantae
Division: Chlorophyta
Class: Chlorophyceae
Order: Sphaeropleales
Family: Hydrodictyaceae
Genus: Pseudopediastrum
E.Hegewald, 2005
Species
  • Pseudopediastrum boryanum
  • Pseudopediastrum kawraiskyi

Description

Pseudopediastrum forms flat colonies, termed coenobia, of cells in powers of two, usually four, eight, 16, or 32. Coenobia are disc-shaped in outline, and marginal cells are drawn out into two lobes or points. Cells have one chloroplast filling the cell, each with a single pyrenoid.[3] In most species, the cells are contiguous without gaps between them, but this is not always the case. Important identifying characteristics include cell shape and cell wall granulation.[4]

Taxonomy

In 2005, molecular phylogenetic analyses showed that Pediastrum sensu lato was paraphyletic with respect to Hydrodictyon. Therefore, Pediastrum was split up into several genera, including Pseudopediastrum.[5] However, the genus Pseudopediastrum is still not monophyletic, in particular the morphologically diverse species Pseudopediastrum boryanum. Therefore, the genus is still in need of a revision.[6]

References
  1. See the NCBI webpage on Pseudopediastrum. Data extracted from the "NCBI taxonomy resources". National Center for Biotechnology Information. Retrieved 2007-03-19.
  2. McManus, Hilary A.; Lewis, Louise A. (2011). "Molecular Phylogenetic Relationships in the Freshwater Family Hydrodictyaceae (Sphaeropleales, Chlorophyceae), with an Emphasis on Pediastrum duplex". Journal of Phycology. 47 (1): 152–163. doi:10.1111/j.1529-8817.2010.00940.x. PMID 27021721. S2CID 20549311.
  3. 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. Lenarczyk, Joanna; Saługa, Marta; Piątek, Jolanta (2020). "Integrative Approach Helps Clarify Confusing Taxonomy of the Pseudopediastrum boryanum Species Complex (Chlorophyceae), Including Recognition of five Distinct Species". Journal of Phycology. 56 (6): 1557–1574. doi:10.1111/jpy.13069. PMID 32920846. S2CID 221672256.
  5. Buchheim, Mark; Buchheim, Julie; Carlson, Tracy; Braband, Anke; Hepperle, Dominik; Krienitz, Lothar; Wolf, Matthias; Hegewald, Eberhard (2005). "Phylogeny of the Hydrodictyaceae (Chlorophyceae): Inferences from rDNA Data". Journal of Phycology. 41 (5): 1039–1054. doi:10.1111/j.1529-8817.2005.00129.x. S2CID 83698514.
  6. Lenarczyk, Joanna; Saługa, Marta (2018). "Evolutionary relationships between the varieties of green algae Pediastrum boryanum and P. duplex s.l. (Chlorophyceae, Hydrodictyaceae)". Fottea. 18 (2): 170–188. doi:10.5507/fot.2018.004. S2CID 91600165.


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