Only 1 species in local flora (unmarked) or
only 1 common species of 2 or more species in the genus (#)
Acrosymphyton taylorii Abbott
Actinotrichia fragilis (Forsskal) BÝrgesen
Ahnfeltiopsis concinna (J. Agardh) Silva & DeCew #; a second species is A. flabelliformis
Arthrocardia prolifera (Joly) Johansen
Asparagopsis taxiformis (Delile) Collins & Hervey
Botryocladia skottsbergii (BÝrgesen) Levring#
Champia parvula (C. Agardh) Harvey #
Choreonema thuretii (Bornet) Schmitz
Coelothrix irregularis (Harvey) BÝrgesen
Corallina elongata Ellis & Solander
Ganonema farinosum (Lamour.) Fan & Wang #
Gelidiella acerosa (Forsskal) Feldmann & Hamel #
Gibsmithia hawaiiensis Doty #
Haliptilon subulatum (Ellis & Solander) Johansen
Haloplegma duperreyi Montagne
Heterosiphonia crispella (C. Agardh) Wynne
Kallymenia sessilis Okamura
Lithophyllum prototypum (Foslie) Foslie (includes Titanoderma tessellatum)
Martensia fragilis Harvey
Melanamansia glomerata (J. Agardh) R.E.Norris #
Mesophyllum mesomorphum (Foslie) Adey
Neogoniolithon brassica-florida (Harvey) Setchell & Mason
Neomartensia flabelliformis (Harvey) Yoshida & Mikami
Plocamium sandvicense J. Agardh
Porphyra vietnamensis Tanaka & Pham
Portieria hornemannii (Lyngbye) Silva
Sporolithon ptychoides Heydrich
Taenioma perpusillum (J. Agardh) J. Agardh
Titanophora pikeanum (Dickie) J. Feldmann
Tolypiocladia glomerulata (C. Agardh) Schmitz
More than 1 common species in Hawaii
Acanthophora pacifica (Setchell) Kraft is less common than A. spicifera (Vahl) BÝrgesen and can be differentiated by its broader axes and its bluish iridescence; A. spicifera is very common intertidally and is spikey or has hard spines on firm, erect axes.
Amphiroa (4 species, not keyed)
Anotrichium (2 species). Anotrichium tenue has tetrasporangia attached in the middle of the bearing cell (pedicel); A. secundum has tetrasporangia borne asymmetrically on the pedicel.
Centroceras clavulatum (C. Agardh) Montagne (Very common); two other species are uncommon and differ mainly in being more slender and lacking conspicuous spines at nodes
Hydrolithon (4 species: not keyed. H. breviclavium, H. reinboldii, H. [=Porolithon] gardineri, [=Porolithon] onkodes
Jania (4 species, not keyed); common species Jania adhaerens
Predaea weldii Kraft & Abbott (differs from P. laciniosa Kraft in lacking gland cells, present in P. laciniosa).
Scinaia furcata Zablackis differs from S. hormoides Setchell in having unconstricted fronds which are markedly constricted in S. hormoides.
Stenopeltis (3 species). All equally common/uncommon; usually growing in clumps; calcified, looks like Galaxaura but very smooth fronds mostly deep red to magenta (needs to be fertile to be identified). S. gracilis is uniformly thinner in diameter than the other two species.
Trichogloea (2 species). T. lubrica Harvey has very few sterile filaments around developing cystocarp; T. requienii (Montagne) J. Agardh has many.
Tricleocarpa (2 species). T. fragilis (Linn.) Huisman & Townsend, one of most common red algae in Hawaii, axes and branches about twice the diameter (2.5 mm in diam.) of the rare T. cylindrica Huisman & Borowitzka, both species are calcified, have smooth surfaces and dichotomous branching.
Wrangelia (2 species). W. elegantissima Norris is an erect plant with soft green and pink axes and branches; upto 10 cm, while W. dumontii (Dawson) Abbott is a creeping plant with short, erect axes that are rose colored, up to 6 mm. Another species includes W. argus.
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