| Abstrakt: |
The agarophyte family Gelidiellaceae currently includes 26 species in two genera, Gelidiellaand Parviphycus, but the generic status and species boundaries have not been fully explored. In order to resolve taxonomic issues in the family, we analyzed mitochondria-encoded cox1and plastid-encoded rbcLand psaAgenes from types and fresh collections including topotype material. The Gelidiellaceae was resolved with five distinct groups, interpreted here as representing five genera: (1) Gelidiella, including the type, (2) Huismaniellagen. nov., (3) Millerellagen. nov., (4) Parviphycuss.str. including the type, and (5) Perronellagen. nov. Gelidiellawas recognized as including a new species, G. flabella, that is described for specimens from Madagascar. A new genus, Huismaniella, is described for the species previously known as Gelidiella ramellosa, characterized by lateral tetrasporangial branchlets inserted at right angles on erect axes and irregularly arranged tetrasporangia. Parviphycusincludes P. adnatuswhich is characterized by simple thalli with tetrasporangial branchlets formed directly on prostate axes and holdfasts forming continuous fringes along the entire length of prostrate axes. The new genus Millerellais described to accommodate five species previously known as Gelidiellaor Parviphycus, characterized by tetrasporangial sori formed on erect axes or branches and unicellular rhizoids forming irregular clumps along prostrate axes. Perronella gracilisgen. et sp. nov. is described for plants with terete axes, multifarious branching, and monosporangia formed on erect axes and branches. The implications for nomenclature, taxonomic revisions, and biogeography in the Gelidiellaceae are discussed. |
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