Sargassum johnsonii

Summary 1

Sargassum johnsonii Chapman, 1961, is a brown seaweed of the genus Sargassum that is endemic to the Three Kings Islands in New Zealand. It is sometimes called totara weed because of the resemblance to the foliage of the NZ native tree totara. Its scientific name derives from its discoverer, Magnus Earle Johnson, Three Kings Islands explorer and captain of the yacht Rosemary, who landed botanists on the islands on several occasions.

Morphology 1

Plants are usually large, with a height of 50–60 cm. The main stem is bare and knobby. Basal leaves have strap-shaped form, simple or lobed with an indistinct midrib. Upper leaves are small, narrow and with an indistinct midrib. Holdfast is a small truncate disc. The thallus is dark brown, with a tough, leathery texture. It has no air-vesicles, and its receptacles are small, swollen, and around 2 mm long, clustered in the axils of the upper leaves.

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