Netrium (Nägeli) Itzigsohn & Rothe, 1856

Holotype species: Netrium digitus (Brébisson ex Ralfs) Itzigsohn & Rothe

Original publication and holotype designation: Rabenhorst, L. (1856). Die Algen Sachsens. Exsiccata. Decades 1-100. . Dresden.

Description: Cell solitary, median sized to large (35-430 um long), elongate-cylindric, elliptic or fusiform (length 2-9 times width), straight, with broadly rounded or truncate ends. Chloroplasts elongate, 2 or 4 per cell, axial, stellate in end view, with 6-12 lateral, longitudinal ridges with smooth, notched or serrate margins. Pyrenoids several, rounded or elongate, in axial row or scattered. Nucleus between chloroplasts. Ultrastructurally, cell wall two-layered, without pores. Asexual reproduction by transverse cell division. Mature daughter cell morphology retained by elongation of severed end. Sexual reproduction by homothallic or heterothallic conjugation known for 5 species. In homothallic strains gametangia often sister cells from recent cell division. Zygote forms in broad conjugation tube; mature zygospore spherical with smooth or wrinkled mesospore wall. Karyogamy at germination, followed by meiosis, producing two gones. Mating type and zygospore morphology show Mendelian inheritance ratios. Netrium cosmopolitan; abundant in acidic, oligotrophic, aquatic habitats or in Sphagnum bogs, with occasional records from more basic habitats (e.g. N. minus in alpine pool, pH 8.0). Emended by Gontcharov & Melkonian (2010: 349).

Information contributed by: J.F. Gerrath. The most recent alteration to this page was made on 2013-05-07 by M.D. Guiry.

Taxonomic status: This name is of an entity that is currently accepted taxonomically.

Most recent taxonomic treatment adopted: Guiry, M.D. (2013). Taxonomy and nomenclature of the Conjugatophyceae (=Zygnematophyceae). Algae. An International Journal of Algal Research 28: 1-29.

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Contributors
Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera, organised in the 1990s by Dr Bruce Parker on behalf of the Phycological Society of America (PSA) and intended to be published in CD format. These AlgaeBase descriptions are now being continually updated, and each current contributor is identified above. The PSA and AlgaeBase warmly acknowledge the generosity of all past and present contributors and particularly the work of Dr Parker.

Descriptions of chrysophyte genera were subsequently published in J. Kristiansen & H.R. Preisig (eds.). 2001. Encyclopedia of Chrysophyte Genera. Bibliotheca Phycologica 110: 1-260.

Linking to this page: https://www.algaebase.org/search/genus/detail/?genus_id=43557

Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 07 May 2013. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 21 November 2024