Abstract
A morpho-taxonomic study of the genus Microdictyon from the littoral of Bahia, Brazil, is presented. The material studied was obtained by dredging in the infralittoral of the Municipality of Canavieiras, as well as from analysis of material collected along the Bahia coast and deposited in the herbaria SPF and RFA. The genus is characterized by a flat thallus, astipitate, monostromatic, composed of open, reticulate laminae formed by apical cell-coalition. Three species were identified, M. boergesenii, M. pseudohapteron and M. umbilicatum, which were defined based on the type of adhesion pads at the tip of cells, presence or absence of constrictions and differences in branching pattern. Microdictyon pseudohapteron presents crenulated adhesion pads on the tip of cells whereas M. boergesenii and M. umbilicatum present apical annulated adhesion, the latter two differing by branching patterns and the presence or absence of constriction. Descriptions, illustrations and comparison with related taxa are provided.
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