Gardnerula G.De Toni, 1936

Holotype species: Gardnerula corymbosa De Toni

Original publication and holotype designation: De Toni, G. [=Giuseppe] (1936). Noterelle di nomenclatura algologica, V. L'Antithamnion tenuissimum Gardner 1927. pp. 1 page only. Bresia.

Description: Filamentous; filaments heteropolar with firm, common, lamellated, at the ends open and lacerated sheaths, to 300 _m diam. at the base (in the upper part narrower), enveloping many parallel, fascicle-like oriented (coaxial) trichomes with their own lamellated sheaths, to 1 cm high; filaments repeatedly (to 5 times) falsely branched, divaricated or forming the compact blue-green strata on the substrate; the upper part of filaments and their branches usually slightly swollen, where are the meristematic zones of trichomes. Common sheaths thick, hyaline, in the inner portions usually yellow-brown. Trichomes blue-green, heteropolar, with a basal heterocyte, usually a little widened at the base, later thin and again clearly widened in the upper part, at the ends narrowed and sometimes elongated into short or long hairs; commonly are developed intercalary heterocytes, at which trichomes separate (false branching) and develop their own sheaths; trichomes in the middle, narrow part more or less cylindrical, not constricted at the crosswalls, at bases and in upper widened parts sometimes constricted. Cells blue-green, at base shorter or slightly longer than wide, in the middle (narrow) part cylindrical and usually longer than wide, in the upper parts shorter than wide and again elongated in hyaline hairs. Heterocytes of different form, hemispherical, spherical, oval to long cylindrical. Aerotopes and akinetes unknown. Cell division cross-wise, particularly in distinct meristematic zones in the upper parts of trichomes. Reproduction by the fragmentation of filaments and by hormogonia, dissociating from the upper parts of trichomes after the separation of the hair. All species are known from the marine littoral, where they grow on the coral rocks and sandstones in the tide region, one species was described from submerged wooden pilings. The type species (G. corymbosa) has probably cosmopolitan distribution in tropical and subtropical areas, other species are known only from the warm seas in SE Asia and southern Pacific..

Information contributed by: J. Komárek. The most recent alteration to this page was made on 2023-03-06 by M.D. Guiry.

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

Gender: This genus name is currently treated as feminine.

Most recent taxonomic treatment adopted: Strunecký, O., Ivanova, A.P. & Mares, J. (2022 '2023'). An updated classification of cyanobacterial orders and families based on phylogenomic and polyphasic analysis (Review). Journal of Phycology 59(1): 12-51.

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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=44065

Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 06 March 2023. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 29 March 2024

 
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