SARGASSUM HORNERI(= S. FILICINUM)IN CALIFORNIA

JACK ENGLEKATHY ANN MILLER

JESSIE ALTSTATTmodified by Lindsay Marks

Brown Algae

Order Fucales

Rockweeds (no bladder) Sargassum (solitary bladders)

Cystoseira (chain bladders) Halidrys (peapod bladders)

Native SargassumS. agardhianum

S. palmeri

Non-Native SargassumS. horneri

S. muticumS.

muticumS.

horneriS.

palmeri

California

S. filicinum form•Monoecious (♀ and ♂)

•Bladders spherical or oval

S. horneri form•Dioecious (♀ or ♂)

•Bladders cylindrical

Sargassum horneri (= S. filicinum)

Recruits

Young branch with symmetrical, pinnate(flat feather) shape and notched margins

Older axes have sharp spineson stipes and branches

Immature plants with air bladders

Tall buoyant immature

Mature plants with reproductive receptacles

Fertile plants with receptacles exuding eggs

Deteriorating Plants

Senescentplants

Sargassum muticumMatureOblong conceptacles

ImmatureCylindrical gas bladders

RecruitThin branches radiating from stipe

Senescent

Sargassum horneri vs. muticum

S. horneri

S. muticumdense, compact branches

bushy, fluffy branches

Sargassum horneri vs. muticum

holdfastsS. horneri S. muticum

One stipe per holdfast, but holdfasts can grow on top of one another

One or several stipes per holdfast

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