Haplospora Kjellman, 1872

Holotype species: Haplospora globosa Kjellman

Original publication and holotype designation: Kjellman, F.R. (1872). Bidrag till kännedomen om Skandinaviens Ectocarpeer och Tilopterider. pp. 1-112, 2 plates. Stockholm: Akademisk afhandling Upsala.

Description: Sporophytic thalli filiform, tufted, mostly oppositely branched, monosiphonous in the upper part and polysiphonous in the other part, with obvious main axis, attached with rhizoidal holdfast, forming terminal quadrinucleate sporangia, sessile or on 1-2 celled stalks. Gametophytic thalli (= Scaphospora stage) similar to sporophyte, somewhat smaller, more delicate, sparser branched. Oogonia intercalary, formed from branch cell by longitudinal division, often in pairs, occasionally arising directly from branch cell. Antheridia formed on the same thalli as oogonia, adjacent to oogonia, plurilocular, pedicellate, tubular. Kuhlenkamp and Müller (1985) cultured H. globosa from Newfoundland and demonstrated alternations between sporophyte and gametophyte without sexual reproduction and nuclear alternations. Sporophyte undergos incomplete meiotic processes in sporangium initials. They detected occurrence of hormosirene in mature gametophytes releasing eggs, however, actual fertilization could not be observed. Sperm did not germinate. Occasional formations of larger loculi in the antheridia observed and those spores developed into new sporophytes. Chromosome number reported to be n=50 (43-54) by them. In Heligoland, only sporophytic plants occur (Kornmann and Sahling 1977). In culture, quadrinucleate spores from field plants developed into sporophytes, whose spores produced a small portion of aposporic gametophytes. Haplospora in Heligoland therefore suggested to have reduced life history with dominating sporophyte. Chromosome counts in these plants n = 25 (22-28).

Information contributed by: H. Kawai. The most recent alteration to this page was made on 2014-06-21 by M.D. Guiry.

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

Most recent taxonomic treatment adopted: Silberfeld, T., Rousseau, F. & Reviers, B. de (2014). An updated classification of brown algae (Ochrophyta, Phaeophyceae). Cryptogamie Algologie 35(2): 117-156.

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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Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera, organised in the 1990s by Dr Bruce Parker on behalf of the Phycological Society of America (PSA) and intended to be published in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=37612

Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 21 June 2014. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 17 August 2022

 
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