Agardhinula De, 1897: 64
Holotype species: Agardhinula browneae (J.Agardh) De Toni
Original publication and holotype designation:De Toni, G.B. (1897). Sylloge algarum omnium hucusque cognitarum. Vol. IV. Florideae. Sectio I. pp. [i]-xx, [i]- lxi + - 388. Patavii [Padua]: Sumptibus auctoris.
Precise date of publication20 Jan 1897
Taxonomic status: currently recognized as a distinct genus.
Substitute name for Diplocystis J.Agardh 1896, non Trevisan 1848. - (30 Aug 2011) - M.D. Guiry
Incertae sedis (Le Gall et al. 2008). - (5 Jul 2011) - Wendy Guiry
Schneider & Wynne (2013: 116) note that Saunders & McDonald (2010) and Schneider et al. (2012) suggested that this genus might possibly be a member of the Fryeellaceae, - (22 Jul 2013) - Wendy Guiry
Description: Thallus with erect dichotomously or trichotomously branched, palmate, laciniate or flabellate flattened fronds, gelatinous. Structure multiaxial, cortex of 2-3 layers of small cells, outer cells anticlinally elongated, medulla of 2-3 layers of large colorless cells interspersed with smaller cells. Spermatangia in widespread, irregular, scattered sori. Procarpic, gonimoblast developing outwards. Cystocarps inconspicuously ostiolate, scattered, never coronate, protruding outwards and inwards, tela arachnoidea absent. Tetrasporangia formed from cortical filaments over most of the thallus surface in large, confluent, reticulate sori. Spores regularly cruciately arranged.
Comments: Hoyt (1920: 488) described the carposporangia of Agardhinula browneae as being enclosed by "...branching filaments running from the wall of the cystocarp", thus suggesting the possibility of a tela arachnoidea; however, Kylin (1956) and Schneider and Searles (1973, 1991) confirmed that such a network is absent. Kylin (1956) placed Agardhinulain the Chrysymenia group, probably because of its gelatinous consistency and the smaller cells occurring between the large medullary cells.
Schneider and Searles (1973) report that in the deep subtidal of North Carolina Agardhinula browneae appears as plants a few mm high in June and matures by late July or early August.
A. browneae is reported from depths of 17-55 m on the continental shelf off North Carolina (Hoyt 1920; Schneider and Searles 1973, 1991) and Florida (Taylor 1960).
NCBI Nucleotide Sequences
Numbers of names and species: There is only one species or infraspecific name in the database at present, which has been flagged as currently accepted taxonomically.
Names: ('C' indicates a name that is currently 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):
Wynne, M.J. & Schneider, C.W. (2010). Addendum to the synoptic review of red algal genera. Botanica Marina 53: 291-299.
Le Gall, L., Dalen, J.L. & Saunders, G.W. (2008). Phylogenetic analyses of the red algal order Rhodymeniales supports recognition of the Hymenocladiaceae fam. nov., Fryeellaceae fam. nov., and Neogastroclonium gen. nov. Journal of Phycology 44: 1556-1571.
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: http://www.algaebase.org/search/genus/detail/?genus_id=42501
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 2014. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 09 March 2014.
Algaebase taxon LSID: urn:lsid:algaebase.org:taxname:7690