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Brown Seaweeds
Division Heterokontophyta
HAWAII
Asteronema breviarticulatum
Makapu'u intertidal, Oahu |
Portlock, Oahu |
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| Found as tufts on shaded vertical surfaces in the splash zone. |
Chnoospora
minima
Makapu'u intertidal, Oahu |
Makapu'u intertidal, Oahu |
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| Found on rocky coasts exposed to breaking
waves. |
Nemacystus decipiens
 Makua, Oahu,
20 feet |
Makua, Oahu, 20 feet |
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| A slippery species found during summer on rocks at any depth.
Attains 16 inches. Hawaii & the Indo-Pacific. |
Colpomenia sinuosa
Makapu'u tidepool, Oahu
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Makapu'u tidepool, Oahu |
Black Point, Oahu |
Black Point, Oahu |
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| Common on reefs to at least 80 feet. Hollow. |
Dictyota
acutiloba
Ft. Kamehameha, Oahu, 3 feet
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Ft. Kamehameha, Oahu, 3 feet |
Makua, Oahu, 15 feet
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Makua, Oahu, 15 feet |
Makua, Oahu, 15 feet
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Makua, Oahu, 15 feet |
Makua, Oahu, 15 feet |
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| Common on sandy reef flats. Blades are thin and twisted. |
Dictyota ciliolata
Kapoho Point, Kailua, Oahu
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Kapoho Point, Kailua, Oahu |
Kapoho Point, Kailua, Oahu |
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| Common on shallow reefs. Yellow-green blades are flat and edges
lack denticles. |
Dictyota ceylanica
Makapu'u tidepool, Oahu |
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| Common in turfs on rocks in shallow water. Blades are less than
2mm wide. |
Dictyota friabilis
Baby Barge, Oahu, 70 feet
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Baby Barge, Oahu, 70 feet |
Black Point, Oahu |
Black Point, Oahu |
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| Common on shaded surfaces at any depth. Tips form a Y
pattern. |
Dictyota sandvicensis
Kapoho Point, Kailua, Oahu |
Kapoho Point, Kailua, Oahu |
Black Point, Oahu
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Black Point, Oahu |
Kapoho Point, Kailua, Oahu |
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| Common on shallow reefs. Yellow-green blades are flat and edges
have denticles. |
Dictyopteris australis
| A large species abundant on sandy reefs in deeper water.
Midrib present with brown spots forming 'V' marks with apex toward tip
of blade. |
Dictyopteris plagiogramma
Makapu'u, Oahu, 15 feet
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Makapu'u, Oahu, 15 feet |
Makapu'u, Oahu, 15 feet |
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| A small species abundant on rocky shores exposed to wave action.
Midrib present with brown spots forming 'V' marks with apex toward base
of blade. |
Hydroclathrus clathratus
Makapu'u tidepool, Oahu |
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| Occasional on rocky shores exposed to wave action. |
Lobophora variegata
Makapu'u tidepool, Oahu
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Makapu'u tidepool, Oahu |
Makapu'u tidepool, Oahu
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Haleiwa Trench, Oahu, 15 feet |
Haleiwa Trench, Oahu, 35 feet |
Haleiwa Trench, Oahu, 35 feet |
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| Abundant on shaded surfaces. Brown or orange with free
edges. Stiff and lightly calcified. |
Padina australis
Makapu'u intertidal, Oahu
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Makapu'u intertidal, Oahu |
Makapu'u intertidal, Oahu |
Makapu'u intertidal, Oahu |
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| Abundant on quiet sandy reefs. Blades are several inches wide
with torn margins. Lightly calcified. |
Padina gymnospora
Ft. Kamehameha, Oahu, 3 feet
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| A large lightly calcified species uncommon on sandy reef flats. |
Padina sanctae-crucis
Makapu'u tidepool, Oahu
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Diamond Head, Oahu |
Diamond Head, Oahu |
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| Abundant on rocks in shallow water exposed to wave action.
Well-calcified and about 1 inch wide. |
Padina melemele
 Firehouse, Oahu,
40 feet |
Firehouse, Oahu, 40 feet |
Firehouse, Oahu, 40 feet |
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| Quite rare in shaded areas at scuba depths. Stiff, well-calcified
with dark yellow color. 1 inch wide. |
Rosenvingea intricata
Makapu'u tidepool, Oahu |
Makapu'u tidepool, Oahu |
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| A delicate seaweed that is rare in shallow water and tidepools. |
Sargassum echinocarpum
Makapu'u tidepool, Oahu
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Makapu'u tidepool, Oahu |
Makapu'u tidepool, Oahu |
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| Abundant on reefs exposed to wave action. Blades are broad,
thick and spiny. |
Sargassum obtusifolium
Mokuleia tidepool, Oahu
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Mokuleia tidepool, Oahu |
Makapu'u tidepool, Oahu
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Makapu'u tidepool, Oahu |
Makapu'u tidepool, Oahu |
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| Abundant on reefs exposed to wave action. Blades are thin,
narrow, and elongated. |
Sargassum
polyphyllum
Makapu'u intertidal, Oahu
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Makapu'u intertidal, Oahu |
Makapu'u intertidal, Oahu |
Makapu'u intertidal, Oahu |
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| Abundant on reefs exposed to wave action. Blades are narrow,
short, and undulated. |
Ralfsia
expansa
Black Point, Oahu |
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| Forms dark crust on rocks in the intertidal & shallow subtidal.
Warm seas worldwide. |
Sphaecelaria
sp.
Makapu'u tidepool, Oahu |
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| Found in tidepools exposed to wave action. |
Stypopodium flabelliforme
Kapoho Point, Kailua, Oahu, 2 feet |
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| Common on sandy reefs in shallow water. Blades are circular with
torn margins. Not calcified. |
Turbinaria
ornata
Makapu'u, Oahu
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Makapu'u, Oahu |
Black Point, Oahu |
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| Abundant on surf-washed rocks in shallow water. |
NORTHEAST PACIFIC
Fucus gardneri
Victoria, Canada |
Victoria, Canada |
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ROCKWEED
| Abundant on rocks in the intertidal and shallow subtidal. Alaska
to Central California. Formerly known as Fucus distichus. |
Macrocystis pyrifera
Long Point, Catalina, California, 20 feet |
Long Point, Catalina, California, 20 feet
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Rock Quarry, Catalina, California, 30 feet |
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GIANT PERENNIAL KELP
| Abundant on rocky reefs. Grows up to 14 inches per day.
Holdfast is pear-shaped and is the only part that survives during winter
storms. The most common large kelp south of Central
California. Alaska to Mexico; Peru to Chile; Tasmania & New
Zealand. |
Nereocystus luetkeana
Ogden Point, Victoria, Canada, 30 feet |
Ogden Point, Victoria, Canada, 30 feet |
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BULL KELP
| Abundant in nearshore waters, attached to hard surfaces including
burrowing clams. In extreme situations the singular stipe may
attain a length of 118 feet. Most common large kelp north of
Central California to the Aleutian Islands. |
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