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Hawaiian Phaeophyta

Roy T. Tsuda Botany 399 Dr. Maxwell S. Doty

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Key to the Hawaiian Phaeophyta

1 - Fronds either dichotomous or possessing distinct stems bearing leaf-like structures having cylindrical bases - - - - - - - - - - - - - - - - - 2 1 - Fronds neither dichotomous nor bearing leaves with cylindrical bases on stems - - - - - - - - - - 6

2 - Fronds dichotomous - - - - - - - - - - - 4

2 - Fronds not dichotomous - - - - - - - - - - - 3 3 - Leaves somewhat conical or triangular in cross section at their apices; thallus a spiny cone with peltate leaves - - - - - - - - - - Turbinaria ornata 3 - leaves flat or filament-like in cross section; thallus an ambient branched or non-branched frond bearing flat leaves - - - - - - - - - - - - - Sargassum (16)

4 - Fronds flat or, if oval, arising from one apical cell - - - - - - - - - - - - 5

4 - Fronds oval and solid in cross section with no distinct apical cell - - - - - - - - - - Dictyota (20) 5 - Fronds with a midrib; blades arising from several apical cells - - - - - - - - - Dictyopteris (23)

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