Abstract The diminutive marine red alga Apoglossum gregarium (Dawson) Wynne (Delesseriaceae, Rhodophyta) is reported for the first time in the Mediterranean, where it grows in deep water as an epibiont on gorgonians. Vegetative and reproductive characteristics of the plants are illustrated and their occurrence along the Tuscan Archipelago shore is discussed. Introduction Material and Methods In the Mediterranean, genera and species belonging to the Delesseriaceae are not very numerous. In particular the diminutive species which grow in deep water habitats have been little investigated in recent years. During a floristic survey of the deep water algal flora of the Tuscan Archipelago a delesseriacean alga whose morphology agrees with the genus Apoglossum was collected growing on gorgonians. In the Mediterranean this genus has been represented only by the type species Apoglossum ruscifolium (Turner) J. Agardh, which is widely distributed both in the western (Ballesteros and Romero 1982, Boudouresque et al 1984, Giaccone et al. 1985, Ben Mai'z et al. 1987 a) and eastern areas (Athanasiadis 1987). Collections of tetrasporangial and gametangial plants has made possible the identification of our material as A. gregarium (Dawson) Wynne, a species previously known from southern California and Pacific Mexico (Wynne 1985), the Caribbean
Botanica Marina – de Gruyter
Published: Jan 1, 1993
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