Abstract

Microcladia exserta, a new species of the red algal genus Microcladia Greville (Ceramiaceae, Ceramiales), is described from the Natal coast of South Africa. This small, creeping alga, an epiphyte on the coralline alga Amphiroa anceps (Lamarck) Decaisne, is distinguished from other species in the genus by the following combination of characteristics: the prostrate habit, the exerted position of the tetrasporangia, and the presence in the cortex of numerous and conspicuous vesicle cells. Evidence is presented to demonstrate that the criterion of an erect habit in Microcladia vs. a prostrate habit in Herpochondria used to separate these genera is not sound.

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