Abstract
The presence of three species of Halymenia (Halymeniaceae), H. durvillei Bory de Saint-Vincent, H. dilatata Zanardini and H. maculata J. Agardh in Malaysia is confirmed by their gross morphology and anatomical features. The reproductive details of H. durvillei including the Halymenia-type auxiliary-cell ampullae are described for the first time. Peyssonnelia inamoena Pilger (Peyssonneliaceae) is reported from Malaysia for the first time, and its monoecious gametophytes and its P. harveyana-type spermatangial development are confirmed. A small-statured new species of Lomentaria (Lomentariaceae), L. gracillima Masuda et Kogame, is described on the basis of such characteristic features as very short and slender axes (up to 8 mm long by 200–250 μm wide) and the production of tetrasporangial sori in fairly wide regions of ascending axes and erect branches: the subapical or middle portions of the axes; and the proximal to middle portions of the branches.
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