The red algal genus Reticulocaulis from the Arabian Sea, including R. obpyriformis sp. nov., with comments on the family Naccariaceae
2003
Schils, Tom | De Clerck, Olivier | Coppejans, Eric
Reticulocaulis obpyriformis Schils, sp. nov. is described from the south coast of Socotra Island (Yemen), and a second species, R. mucosissimus, is recorded from a similar upwelling area in the Arabian Sea (Masirah Island, Oman). These are the first published records of Naccariaceae for the Indian Ocean and end the monospecific, Hawaiian-endemic status of Reticulocaulis. Features distinguishing R. obpyriformis from R. mucosissimus include its more sparsely branched thallus, obpyriform rather than cylindrical inner cortical cells, the presence of short moniliform laterals of small spherical cells on the cortical filaments, monoecious rather than dioecious gametophytes, and the direct development of spermatangia from catenate mother cells. The morphology and anatomy of the gametophytes of this heteromorphic genus are discussed in relation to those of other naccariacean genera.
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