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) Børgesen

Ahnfeltiopsis concinna (J. Agardh) Silva & DeCew #; a second species is A. flabelliformis

Arthrocardia prolifera (Joly) Johansen

Asparagopsis taxiformis (Delile) Collins & Hervey

Botryocladia skottsbergii (Børgesen) Levring#

Champia parvula (C. Agardh) Harvey #

Choreonema thuretii (Bornet) Schmitz

Coelothrix irregularis (Harvey) Børgesen

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 Hawai’i

Acanthophora pacifica (Setchell) Kraft is less common than A. spicifera (Vahl) Børgesen 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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