Abstract
Observations on the frustular morphology of fresh material of M. moniliformis were compared with those on material from the herbarium of C. A. Agardh, using light and electron microscopy. A neotype has been chosen from Agardh''s collection and slides were placed in the Botanical Museum, the University of Lund and in the British Museum (Natural History). There is a revised description of this species and a comparison with the type species of the genus, M. nummuloides.

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