Bostrychia scorpioides, copyright Raquel Sánchez de Pedro.

Belongs within: Rhodomelaceae.

The Bostrychieae is a group of two genera of Rhodomelaceae, distinguished from other members of the family by the absence of trichoblasts, together with distinctive female reproductive features (Womersley 2003).

Characters (from Womersley 2003): Thallus apices dorsiventrally developed, with polysiphonous indeterminate axes bearing polysiphonous and monosiphonous determinate laterals usually at regular intervals; trichoblasts absent; axes attached by clumped rhizoids. Branching mostly exogenous. Polysiphonous branches with 4–9 pericentral cells dividing transversely into 2–5 tiers; ecorticate or corticated. Procarps formed on 2–6 or more successive polysiphonous segments, each segment with 1–4 procarps each with the fertile pericentral (supporting) cell, a lateral sterile group of 2–6 cells and a (3–) 4-celled carpogonial branch; carposporophyte with a branched gonimoblast bearing terminal carposporangia; cystocarps with a post fertilization pericarp of 6–14 longitudinal filaments, each cell cutting off 2 (–3) outer pericentral cells, usually corticated. Spermatangia forming an outer layer on polysiphonous determinate laterals. Tetrasporangial stichidia on determinate laterals, each segment with 4–5 pericentral cells and whorled tetrasporangia, protected by cover cells.

    |--Stictosiphonia Hooker & Harvey in Hooker 1847 W03
    |    |--S. intricata (Bory) Silva in Silva et al. 1996 (see below for synonymy) W03
    |    `--S. kelanensis ZW03
    `--Bostrychia Montagne 1842 (nom. cons.) W03
         |--*B. scorpioides W03
         |--B. arbuscula Hooker & Harvey 1855 L27
         |--B. caespitula Agardh 1899 L27
         |--B. harveyi Montagne 1852 [incl. B. australasica Sonder 1855, B. distans Harvey 1855] W03
         |--B. laingii Agardh 1899 L27
         |--B. moritziana (Sonder) Agardh 1863 [=Polysiphonia moritziana Sonder ex Kützing 1849] W03
         |--B. novae-zelandiae Agardh 1899 L27
         |--B. radicans ZW03
         |--B. similis Rbd. 1905 L27
         |--B. simpliciuscula W03
         `--B. tenuissima King & Puttock 1989 [incl. B. tenuis f. typica Post 1936] W03

Stictosiphonia intricata (Bory) Silva in Silva et al. 1996 [=Scytonema intricatum Bory 1828, Bostrychia intricata (Bory) Montagne 1852; incl. B. hookeri Harvey in Harvey & Hooker 1845, *Stictosiphonia hookeri (Harvey) Harvey in Hooker 1847, B. mixta Hooker & Harvey 1845, Amphibia mixta (Hooker & Harvey) Kuntze 1891] W03

*Type species of generic name indicated


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

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

[ZW03] Zuccarello, G. C., & J. A. West. 2003. Multiple cryptic species: molecular diversity and reproductive isolation in the Bostrychia radicans/B. moritziana complex (Rhodomelaceae, Rhodophyta) with focus on North American isolates. Journal of Phycology 39: 948–959.

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