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Several characteristics that have been neglected in assessing species of Gracilaria are ( I ) type of spermatangia, (2) chromosome number and (3) interfertility. Spermatangial configuration, although easily determined, is documented for fewer than half of the currently recognized species, mostly those of the Pacific Ocean. It is shown, however, how discrepancies in type of spermatangia are useful in distinguishing otherwise similar entities from widely separated locales. Discovery of Spermatangial type in original collections of older species may necessitate revision of modern concepts of these taxa. Chromosome number and interfertility are impractical for routine identiflcation, but are i mp o r tan t determinants of natural species in this assemblage of rnorphologically variable entities. The chromosome number of n = 32 for the type species, G. verrucosa, is contrasted with n = 24 for the other six taxa investigated. Despite similarities in morphology, anatomy, and chromosome number, species of Gracilaria appear to be genetically segregated and it is suggested that interfertility thus is a valuable aid to establishing species limits. A plea is made for comparative studies of these features at the level of population. Introduction Taxanomy in Gracilaria Grev., äs in most large genera of algae, is
Botanica Marina – de Gruyter
Published: Jan 1, 1982
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