Abstract

Abstract Orculifilum denticulatum gen. et sp. nov. is described from the northeastern Pacific Ocean. This rare alga resembles Leptocladia peruviana and some specimens of Farlowia mollis in its compressed, pinnately branched habit. Like Leptocladia and Farlowia, Orculifilum has a single dome-shaped apical cell that divides transversely and subapical cells that produce two lateral upward sweeping branches and two transverse branches that provide cortication. The lateral branches can extend across the width of the thallus into the sparse to proliferous macroscopic appendages. Orculifilum denticulatum differs from these species vegetatively in details of the mature axial cell. Reproductively, Orculifilum denticulatum resembles species of Weeksia, Constantinea, and Leptocladia in having distal humerus-like cells on reproductive filaments, relatively large connecting filaments, and a carpostome above mature cystocarps. However, it appears to lack the relatively large gonimoblast fusion cell that occurs in matur...

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