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Green Seaweeds
Division
Chlorophyta
HAWAII
Avrainvillea amadelpha
Wailupe, Oahu, 2 feet |
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MUDWEED
| Alien invasive species that grows in sand as clumps from a
bulbous holdfast. Stiff blades trap silt and transform reefs into
mudflats. Also forms dense meadows in deep water.
Accidentally introduced to Hawaii around the 1980's. |
Boodlea composita
Makapu'u intertidal, Oahu |
Makapu'u tidepool, Oahu |
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| Spongy masses are common on rocks and tidepools exposed to surge. |
Bornetella sphaerica
Makapu'u intertidal, Oahu |
Makapu'u intertidal, Oahu |
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| Common on reefs and stones in shallow water. About 1 cm. |
Bryopsis pennata var.
pennata
Midway Lagoon
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Midway Lagoon |
Kaupo Bay, Oahu, 3 feet |
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| Common on shallow reefs close to shore. Preyed upon by Elysia
slugs. |
Caulerpa lentillifera
Okinawa, Japan
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Okinawa, Japan |
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| Rare in Hawaii on sandy reefs. |
Caulerpa nummularia
Pupukea tidepool, Oahu |
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| Uncommon in shallow water. Discs have scalloped margins and
stems are thin. |
Caulerpa racemosa
Makapu'u tidepool, Oahu
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Makapu'u tidepool, Oahu |
variety peltata, Makapu'u tidepool, Oahu
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variety peltata, Makapu'u tidepool, Oahu |
var. peltata, Black Point, Oahu |
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| Common in shallow water. Forms thick mats in some places.
Tip may be clustered spheres or discs, stems are thick. |
Caulerpa serrulata
Makapu'u tidepool, Oahu |
Wailupe, Oahu, 3 feet |
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| Common in shallow water and tidepools. |
Caulerpa sertularoides
Midway Harbor, 10 feet |
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| Occasional on sand and reef in shallow water. |
Caulerpa taxifolia
Pupukea tidepool, Oahu
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Makapu'u tidepool, Oahu |
Makapu'u tidepool, Oahu
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Makapu'u tidepool, Oahu |
Makapu'u tidepool, Oahu |
Sea Tiger Wreck, Oahu, 95 feet |
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| Common in tidepools and in shallow water. |
Caulerpa verticillata
Caulerpa webbiana
Makapu'u tidepool, Oahu
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Makapu'u tidepool, Oahu |
Makapu'u tidepool, Oahu
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Sea Cave, Oahu, 80 feet |
Sea Cave, Oahu, 80 feet |
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| Uncommon on wave benches and in shallow water. Tufts are 3mm
wide. |
Caulerpella ambigua
Shipwreck Beach, Lana'i, 80 feet
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Shipwreck Beach, Lana'i, 80 feet |
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| Rare in Hawaii, epiphytic and on stones in shallow or deep water. |
Chaetomorpha antennina
Makapu'u intertidal, Oahu
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Black Point, Oahu |
Black Point, Oahu
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Black Point, Oahu |
Black Point, Oahu |
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| Stiff, up to 10 cm tall. Occasional on rocky outcrops in the
intertidal zone. |
Chaetomorpha basiretorsa
 Black Point, Oahu |
Black Point, Oahu |
Black Point, Oahu |
Black Point, Oahu |
Black Point, Oahu |
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| Forms dense patches on rocks among sand in the intertidal. |
Cladophora laetevirens
Makapu'u intertidal, Oahu |
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| Uncommon in shady areas exposed to surge. |
Cladophora catenata
Makapu'u tidepool, Oahu
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Makapu'u intertidal, Oahu |
Wailupe, Oahu, 3 feet |
Wailupe, Oahu, 3 feet |
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| Common, forming coarse mats in shallow water exposed to surge.
Formerly known as Cladophoropsis luxurians. |
Cladophora vagabunda
Kapoho Point, Kailua, Oahu
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Portlock, Oahu |
Diamond Head, Oahu |
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| Abundant high on limestone benches with freshwater intrusion, up to 50cm long. |
Cladophora spp.
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Makapuu tidepool, Oahu |
Black Point, Oahu |
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| Various species found in the intertidal zone. Difficult to
identify without a microscope. |
Cladophoropsis sundanensis
Kapoho Point, Kailua, Oahu |
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| Forms dense mats of thin filaments on reefs in shallow water. |
Codium arabicum
Makapu'u tidepool, Oahu
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Makapu'u tidepool, Oahu |
Makapu'u tidepool, Oahu |
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| Common on shaded surfaces on shallow reefs and tidepools. |
Codium edule
Makapu'u tidepool, Oahu |
Makapu'u tidepool, Oahu |
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| Creeping tangled branches form large mats on shallow reefs and
tidepools. |
Codium reediae
Makapu'u tidepool, Oahu
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Wailupe, Oahu, 3 feet |
Black Point, Oahu |
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| Forms erect plants in shallow water. Uncommon. |
Dictyosphaeria cavernosa
Kaneohe Bay, Oahu, 3 feet |
Kaneohe Bay, Oahu, 3 feet |
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| Sheets of bright green cells form hollow irregular spheres that can
overgrow corals nutrient-rich bays such as Kane'ohe Bay. |
Dictyosphaeria versluysii
Kaneohe Bay, Oahu, 2 feet
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Kapoho Point, Kailua, Oahu |
Makapu'u tidepool, Oahu |
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| Blue-green cells form solid lumps or encrusting sheets in shallow
water. |
Halimeda discoidea
Makai Pier, Oahu
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Makai Pier, Oahu |
Ka'a'awa, Oahu, 4 feet
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Night, Makapu'u tidepool, Oahu |
Wailupe, Oahu, 3 feet |
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| Plants are short, forming mats of rounded segments. Common on
reefs and in tidepools. |
Halimeda kanaloana
Shipwreck Beach, Lana'i, 80 feet
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| Upright plants of angular segments with a bulbous holdfast common in
sand or mud in deep water. Endemic to Hawaii. |
Halimeda opuntia
| Twisted creeping plants of spade-shaped segments, trichotomus
branching. Uncommon in the main Hawaiian Islands. |
Microdictyon umbilicatum
Ft. Kamehameha, Oahu, 3 feet
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Makapu'u tidepool, Oahu |
Makapu'u tidepool, Oahu |
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| Meshwork of fine segments forming delicate plants in protected
areas. Formerly known in Hawaii as M. japonicum. |
Microdictyon setchellianum
Pupukea tidepool, Oahu
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Makapu'u intertidal, Oahu |
Makapu'u tidepool, Oahu |
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| Meshwork of coarse segments forming crisp mats on reefs. Often
coated by coralline algae. |
Neomeris annulata
Kapoho Point, Kailua, Oahu
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Kaloko, Oahu, 3 feet |
Atlantis Reef, Waikiki, Oahu, 120 feet |
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| Common on shallow reefs and tidepools. Calcified gametangia form
rings on base. |
Neomeris vanbosseae
Pupukea tidepool, Oahu
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Pupukea tidepool, Oahu |
Kahe Point, Oahu, 20 feet |
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| Common on shallow reefs and in tidepools. Calcified spherical
gametangia are attached individually on base. |
Ulva expansa
Ma'ili Point, Oahu, 2 feet |
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| Plants are broad blades without divisions and weak holdfast, color
variable. Hawaii, British Columbia south to Baja
California. |
Ulva fasciata
Ala Moana, Oahu, 3 feet |
Black Point, Oahu
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Black Point, Oahu
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Black Point, Oahu |
Black Point, Oahu |
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| Plants are long blades with numerous divisions and stout holdfast,
color variable. Abundant on rocks in brackish water along the
shoreline. |
Ulva reticulata
| Blades are ribbon-like, pockmarked with holes of any size and
shape. Commonly tangled with other seaweeds. |
Valonia aegagropilia
Makapu'u tidepool, Oahu |
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| Clumps of oval vesicles about 5 mm long. Common on shaded
surfaces, under stones, and mats in shallow water and tidepools. |
Ventricaria ventricosa
Kaneohe Bay, Oahu, 2 feet |
Kaneohe Bay, Oahu, 2 feet |
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| Dark green sphere up to 2 inches in diameter. Actually a single
cell with many nuclei. Warm seas worldwide. |
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