oa Journal of East African Natural History - Notes on Kenya Acetabularia Lamouroux (Chlorophyta)



Acetabularia is a pan-tropical genus with extra-tropical extensions. It comprises about twenty species which are all marine. The mature thallus is calcified (in varying degrees according to the species) and has an erect, unbranched siphonous stipe terminating in one or more whorls of gametangial rays. The rays may be free or fused along their lateral margins and contain numerous spherical cysts at maturity. On the upper surface and near the base, each ray bears a coronal knob, which knobs jointly comprise the corona superior. Some species also have a corona inferior below the gametangial rays. The corona superior bears delicate, decidous hairs, which in certain species are rudimentary. On the east coast of Africa, Acetabularia has been recorded in South Africa (Levring, 1938; Papenfuss & Egerod, 1957) and in Mozambique at Inhaca Island and Peninsula (Isaac & Chamberlain, 1958). As far as the author has been able to ascertain from the records available to her, the genus Acetabularia has not been previously recorded for the Kenya coast.


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