Holotype species: Kornmannia leptoderma (Kjellman) Bliding
Original publication and holotype designation: Bliding, C. (1969 '1968'). A critical survey of European taxa in Ulvales, Part II. Ulva, Ulvaria, Monostroma, Kornmannia. Botaniska Notiser 121: 535-629, 47 figs.
Taxonomic status: currently recognized as a distinct genus.
Gender: This genus name is currently treated as feminine.
Most recent taxonomic treatment adopted: Golden, L. & Cole, K.M. (1986). Studies on the green alga Kornmannia (Kornmanniaceae fam. nov., Ulotrichales) in British Columbia. Japanese Journal of Phycology 34: 263-274.
Description: Life history heteromorphic with gametophytic thalli consisting of microscopic, crustose, filamentous plants; sporophytes upright monostromatic leafy blades 1-2 cm or up to 10 cm in height. Basal system of blades discoid, developing from prostrate filaments. Blades usually formed by upheaval of sac from prostrate system, but occasionally develop from uniseriate filaments produced by crust. Blade differentiated into stipe region with elongate cells commonly with rhizoidal processes, cells in distal portion of blade polygonal and isodiametric, usually about 5 &m (-9) in diameter. In saccate stages cells in linear files, increasingly random with blade maturation. Gametophytic plants a microscopic pseudoparenchymatous disc. Cells with single nucleus and large parietal chloroplast without apparent pyrenoid using light microscopy. Ultrastructurally pyrenoids single per cell and ellipsoidal, without a starch sheath and without traversing thylakoids, but bound by thylakoid membranes. Asexual reproduction by means of zoospores produced on sporophytic blades. Sporangia formed from vegetative cells. Zoospores 4-5 &m long; without eyespot. Spores develop into new new sporophytic plants or into gametophytes. Maximum release during spring tides. Sexual reproduction by monoecious isogametes, these ca 4 &m and biflagellate, produced on crustose plants. Life history highly variable and population specific; Atlantic populations asexual, Pacific populations asexual and sexual. Kormannia widely distributed in temperate waters of the the North Atlantic and North Pacific Oceans; occasioanly in freshwater in high ionicor hard water conditions. Typically epiphytic on seagrasses (hence K. zostericola = K. leptoderma) it can also be found on red and brown seaweeds. Culture experiments show that temperature and daylenght can modify ontogeny and reproductive patterns. Protocols for the development of viable protoplasts have been developed such that protoplasts regeneate walls and develop into new blades. Two additional species have been recognized in Kornmannia (K. zostericola and Monostroma aereolatum), however, all isolates extremely similar in culture with variation in presence of sexuality, and host, blade size and shape. Further study required to adequately distinguish among them. Kornmannia only genus in family.
Information contributed by: D. Garbary. The most recent alteration to this page was made on 28 Dec 2014 by M.D. Guiry.
Numbers of names and species: There are 2 species names in the database at present, of which 1 has been flagged as accepted taxonomically on the basis of the listed literature under the species name. In some instances, opinions on taxonomic validity differ from author to author and users are encouraged to form their own opinion. AlgaeBase is a work in progress and should not be regarded as a definitive source only as a guide to the literature..
Names: ('C' indicates a name that is accepted taxonomically; 'S' a homotypic or heterotypic synonym; 'U' indicates a name of uncertain taxonomic status, but which has been subjected to some verification nomenclaturally; 'P' indicates a preliminary AlgaeBase entry that has not been subjected to any kind of verification. For more information on a species click on it to activate a link to the Species database):
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Verification of data
Users are responsible for verifying the accuracy of information before use, as noted on the website Content page.
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.
Created: 28 December 2000 by M.D. Guiry
Verified by: 28 December 2014 by M.D. Guiry
Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=38356
Please cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 2018. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 19 September 2018.