Hyalosiphonia Okamura, 1909

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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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 2010-10-07 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: 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.

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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Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera, organised in the 1990s by Dr Bruce Parker on behalf of the Phycological Society of America (PSA) and intended to be published in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=41572

Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 07 October 2010. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 28 March 2024

 
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