152,876 species and infraspecific names are in the database, 20,938 images, 59,117 bibliographic items, 408,264 distributional records.

Hennedya Harvey, 1855

Classification:
Empire Eukaryota
Kingdom Plantae
Subkingdom Biliphyta
Phylum Rhodophyta
Subphylum Eurhodophytina
Class Florideophyceae
Subclass Rhodymeniophycidae
Order Gigartinales
Family Acrotylaceae

Holotype species: Hennedya crispa Harvey

Original publication and holotype designation: Harvey, W.H. (1855). Some account of the marine botany of the colony of western Australia. Transactions of the Royal Irish Academy 22: 525-566.
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Taxonomic status: currently recognized as a distinct genus.

Most recent taxonomic treatment adopted: Kraft, G.T. & Womersley, H.B.S. (1994). Family Acrotylaceae Schmitz 1892: 18. In: The marine benthic flora of southern Australia. Rhodophyta - Part IIIA. (Womersley, H.B.S. Eds), pp. 363-376. Canberra:

Description: Plants reach 20 cm in length, are epilithic, erect from a discoid holdfast, and consist of perennial subterete cartilaginous axes bearing numerous subdichotomous blades. Blades are composed of a single layer of conspicuously enlarged subisodiametric inner cortical cells bordering both sides of the narrow, filamentous medulla. The inner cortical layer is bordered by 3-4 layers of small, isodiametric outer cortical cells. Supporting cells are monocarpogonial and bear 2-celled carpogonial branches. Gonimoblasts develop inwardly and enter a broad hull of centrepitally directed nutritive filaments. Carposporangia are borne singly on most cells of the centrepital gonimoblast filaments. Cystocarps form singly or in small groups at tips of blade lobes and are strongly protruberant. The ostioles that form in the pericarp appear to be anatomically distinct, not merely the result of local cortical disruption. Tetrasporangia are scattered throughout the cortex of blades and are laterally attached to bearing cells (Kraft, 1977).

Information contributed by: G.T. Kraft. The most recent alteration to this page was made on 7 Oct 2010 by M.D. Guiry.

Comments: Distribution: Plants grow subtidally down to at least 24 m depth endemic to southwest southern Australia from Geraldton to Pearson Island.

Numbers of names and species: There is only one species or infraspecific name in the database at present, which 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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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.

Created: 01 January 2001 by M.D. Guiry

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Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=39894

Citing AlgaeBase
Please cite this record as:
Guiry, M.D. & Guiry, G.M. 2018. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 18 September 2018.

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