Iwanoffia Pascher, 1905

Holotype species: Iwanoffia terrestris (Iwanoff) Pascher

Original publication and holotype designation: Pascher, A. (1905). Zur Kenntnis der geschlechtlichen Fortpflanzung bei Stigeoclonium sp. (S. fasciculatum Kuetz?). Flora (Jena) 95: 95-107.

Description: Plants heterotrichous, consisting of branched, uniseriate filaments, attached by colourless rhizoids. Filaments of erect system narrower than those of prostrate system, branches of erect system with terminal hairs. Cells uninucleate each with single parietal chloroplast and one or many pyrenoids. Asexual reproduction by biflagellate zoids, single macrozoospore or two microzoospores, produced per sporangium. Spores with two equal flagella. Sexual reproduction unknown. Iwanoffia known only from damp soil from USSR. Closely resembles Stigeoclonium but separated by having biflagellate zoospores and an absence of hairs. Plants heterotrichous, consisting of branched, uniseriate filaments, attached by colourless rhizoids. Filaments of erect system narrower than those of prostrate system, branches of erect system with terminal hairs. Cells uninucleate each with single parietal chloroplast and one or many pyrenoids. Asexual reproduction by biflagellate zoids, single macrozoospore or two microzoospores, produced per sporangium. Spores with two equal flagella. Sexual reproduction unknown. Iwanoffia known only from damp soil from USSR. Closely resembles Stigeoclonium but separated by having biflagellate zoospores and an absence of hairs.

Information contributed by: D.M. John.

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

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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Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera, organised in the 1990s by Dr Bruce Parker on behalf of the Phycological Society of America (PSA) and intended to be published in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=47215

Citing AlgaeBase
Cite this record as:
Guiry, M.D. & Guiry, G.M. 16 July 2012. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 23 November 2024