Herposiphonia sp., copyright D. S. Littler.

Belongs within: Rhodomelaceae.

The Herposiphonieae are red algae with a branched thallus, bearing radial or bilateral determinate laterals on the indeterminate axes, and dorsiventral, usually curved indeterminate apices (Womersley 2003).

Characters (from Womersley 2003): Thallus completely to partially prostrate, often with erect or free upper parts. Branching exogenous, with defined sequences of indeterminate and determinate lateral branches, determinate laterals simple or becoming slightly to regularly branched. Indeterminate axes compressed or subterete, bilaterally or radially developed, apices usually dorsiventrally developed, often curved upwards (dorsally), axes attached by rhizoids from ventral or lateral pericentral cells. Pericentral cells 4 to 16, not divided transversely, usually ecorticate. Trichoblasts usually present on determinate laterals, often rare. Gametophytes dioecious, occasionally monoecious. Procarps borne on basal cells of trichoblasts, fertile axial cells soon becoming polysiphonous. Carposporophytes with basal fusion cell, branched gonimoblast and clavate terminal carposporangia. Cystocarps ovoid to urceolate, lateral on determinate laterals; pericarp ostiolate, usually ecorticate. Spermatangial organs ovoid to lanceoid, on trichoblasts, usually with sterile basal and apical cells. Tetrasporangia in straight to curved determinate laterals, single per segment, in straight to slightly curved rows, with 2–3 cover cells.

    |--Streblocladia neglecta (Montagne) Schmitz. & Falkenberg 1897L27
    |--Microcolax botryocarpa Schmitz & Falkenberg 1897 [=Polysiphonia botryocarpa]L27
    |--Herposiphoniella Womersley 2003W03
    |    `--*H. plurisegmenta Womersley 2003W03
    |--Tiparraria Womersley 2003W03
    |    `--*T. aurata (Harvey) Womersley 2003 [=Polysiphonia aurata Harvey 1855]W03
    |--Herpopteros Falkenberg in Schmitz & Falkenberg 1897W03
    |    `--*H. fallax Falkenberg in Schmitz & Falkenberg 1897W03
    |--Gredgaria Womersley 2003W03
    |    `--*G. maugeana Womersley 2003W03
    |--Dipterosiphonia Schmitz & Falkenberg 1897W03
    |    |--*D. dendritica (Agardh) Schmitz in Schmitz & Falkenberg 1897 (see below for synonymy)W03
    |    |--D. australica Womersley 2003W03
    |    `--D. prorepens Falkenberg 1901W03
    |--Ditria Hollenberg 1967W03
    |    |--*D. reptans Hollenberg 1967W03
    |    |--D. expleta Huisman 1994W03
    |    `--D. zonaricola (Okamura) Yoshida & Yoshida 1983W03
    `--Herposiphonia Nägeli 1846HL09
         |--*H. tenella (Agardh) Ambronn 1880W03 [=H. secunda f. tenellaHK90]
         |--H. calothrix (Harvey) Womersley 2003 (see below for synonymy)W03
         |--H. ceratoclada (Montagne) Falkenberg 1901 [=Polysiphonia ceratoclada Montagne 1845]L27
         |--H. filipendula (Harvey) Falkenberg ex de Toni 1903 [=Polysiphonia filipendula Harvey ex Agardh 1863]W03
         |--H. grandis Kylin 1925S57
         |--H. monilifera (Hooker & Harvey) Falkenberg 1901 [=Polysiphonia monilifera Hooker & Harvey 1847]W03
         |--H. parva Hollenberg 1943S57
         |--H. pectinella (Harvey) Falkenberg 1901W03 (see below for synonymy)
         |--H. prorepens [=Polysiphonia prorepens]W03
         |--H. rigida Gardner 1927S57
         |--H. rostrata (Sonder) Reinbold 1899 (see below for synonymy)W03
         |--H. secunda (Agardh) Ambronn 1880 [=Hutchinsia secunda Agardh 1824]HL09
         `--H. versicolor (Hooker & Harvey) Reinbold 1899 (see below for synonymy)W03

*Dipterosiphonia dendritica (Agardh) Schmitz in Schmitz & Falkenberg 1897 [=Hutchinsia dendritica Agardh 1824, Polysiphonia dendritica (Agardh) Agardh 1863; incl. Poysiphonia heteroclada Agardh 1885, Dipterosiphonia heteroclada (Agardh) Falkenberg 1901]W03

Herposiphonia calothrix (Harvey) Womersley 2003 [=Polysiphonia calothrix Harvey 1855, Lophosiphonia calothrix (Harvey) de Toni 1903]W03

Herposiphonia pectinella (Harvey) Falkenberg 1901 [=Polysiphonia pectinella Harvey 1855; incl. P. pectinata Harvey ex Kützing 1864, P. sullivanae]W03

Herposiphonia rostrata (Sonder) Reinbold 1899 [=Polysiphonia rostrata Sonder 1845, Vertebrata rostrata (Sonder) Kuntze 1891]W03

Herposiphonia versicolor (Hooker & Harvey) Reinbold 1899 [=Polysiphonia versicolor Hooker & Harvey 1847; incl. P. argus Kützing 1864]W03

*Type species of generic name indicated


[HK90] Huisman, J. M., G. A. Kendrick, D. I. Walker & A. Couté. 1990. The marine algae of Shark Bay, Western Australia. In: Berry, P. F., S. D. Bradshaw & B. R. Wilson (eds) Research in Shark Bay: Report of the France-Australe Bicentenary Expedition Committee pp. 89–100. Western Australian Museum.

[HL09] Huisman, J. M., F. Leliaert, H. Veerbruggen & R. A. Townsend. 2009. Marine benthic plants of Western Australia’s shelf-edge atolls. Records of the Western Australian Museum Supplement 77: 50–87.

[L27] Laing, R. M. 1927. A reference list of New Zealand marine algae. Transactions and Proceedings of the New Zealand Institute 57: 126–185.

[S57] Scagel, R. F. 1957. An annotated list of the marine algae of British Columbia and northern Washington (including keys to genera). National Museum of Canada Bulletin 150: 1–289.

[W03] Womersley, H. B. S. 2003. The Marine Benthic Flora of southern Australia. Rhodophyta—part IIID. Ceramiales—Delesseriaceae, Sarcomeniaceae, Rhodomelaceae. Flora of Australia Supplementary Series 18. Australian Biological Resources Study: Canberra, and the State Herbarium of South Australia: Adelaide.

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