153,600 species and infraspecific names are in the database, 20,980 images, 59,403 bibliographic items, 411,227 distributional records.

Hyalosiphonia Okamura, 1909

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

Holotype species: Hyalosiphonia caespitosa Okamura

Original publication and holotype designation: Okamura, K. (1909). Icones of Japanese Algae. Vol. II pp. 41-61, Pl. LXI-LXV. Tokyo: The Author.
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Taxonomic status: currently recognized as a distinct genus.

Gender: This genus name is currently treated as feminine.

Most recent taxonomic treatment adopted: Schneider, C.W. & Wynne, M.J. (2007). A synoptic review of the classification of red algal genera a half a century after Kylin's "Die Gattungen der Rhodophyceen". Botanica Marina 50: 197-249.

Description: Terete, lax. Radially branched to at least four orders; branches tapered at both ends. Annual. Central axial cell and four periaxial cells enlarging greatly. Cortex of subspherical cells, progressively smaller toward cuticle. Rhizoids abundant. Secondary pit connections and hairs present. Dioecious. Carpogonium terminating an adventitious filament, sometimes proximally branched. Connecting filaments from fertilized carpogonial branch contacting a succession of intercalary, distal auxiliary cells on separate adventitious, proximally branched filaments. Secondary connecting filaments and gonimoblast initials cut off remnant of connecting filament attached to auxiliary cell. Proximal cells of gonimoblast incorporated into fusion cell; distal cells maturing into relatively large carposporangia. Cystocarp protuberant. No carpostome; carpospores released by erosion of thallus. Spermatangia superficial, cut off by oblique walls. Tetrasporophyte isomorphic. Tetrasporangia relatively large, cruciate, attached laterally to an intermediate level cortical cell. Fertile in spring and summer. Spore germination: immediate discal type.

Information contributed by: S.C. Lindstrom. The most recent alteration to this page was made on 7 Oct 2010 by M.D. Guiry.

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: 28 December 2000 by M.D. Guiry

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Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=41572

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 17 November 2018.

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