New record of two marine ulvalean species (Chlorophyta) in Korea

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  • ABSTRACT

    Two marine ulvalean species (Chlorophyta) were collected from the southern and eastern coasts of Korea. One is morphologically characterized by usually unbranched or little branched ribbon-shaped thalli, fronds with spirally twisted basal portions and usually undulate margins and 1 (-2) pyrenoids per cell. The other has irregularly shaped thalli, undulate and dentate margins in the fronds, small macroscopic denticulations along the margin and (1-) 2-3 pyrenoids per cell. In phylogenetic tree based on molecular data, the two species nest in the same clade with Ulva flexuosa and U. rigida, respectively. These two Korean entities are identified as U. flexuosa and U. rigida, respectively, based on morphological and molecular analyses. This is the first record of Ulva flexuosa and U. rigida in Korea


  • KEYWORD

    Chlorophyta , Korea , molecular analyses , morphology , new record , Ulva flexuosa , Ulva rigida

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  • [Fig. 1.] Ulva flexuosa Wulfen. (a, b) Habit of vegetative plant. (c, d) Surface view (c) and transverse section (d) of the rectangular to polygonal cells with round corner near upper portion. (e, f) Surface view (e) and transverse section (f) of the oval to rectangular cells near basal portion. Scale bars are presented on the figures.
    Ulva flexuosa Wulfen. (a, b) Habit of vegetative plant. (c, d) Surface view (c) and transverse section (d) of the rectangular to polygonal cells with round corner near upper portion. (e, f) Surface view (e) and transverse section (f) of the oval to rectangular cells near basal portion. Scale bars are presented on the figures.
  • [Fig. 2.] Ulva rigida C. Agardh. (a) Habit of vegetative plant. (b) Details of frond with many denticulations (arrows) along margin. (c) Denticulations with branching. (d) Dentate margin of frond. (e, f ) Surface view (e) and transverse section (f ) of rectangular to polygonal cells with round corner near basal portion. Scale bars are presented on the figures.
    Ulva rigida C. Agardh. (a) Habit of vegetative plant. (b) Details of frond with many denticulations (arrows) along margin. (c) Denticulations with branching. (d) Dentate margin of frond. (e, f ) Surface view (e) and transverse section (f ) of rectangular to polygonal cells with round corner near basal portion. Scale bars are presented on the figures.
  • [Fig. 3.] Phylogenetic tree of selected taxa obtained from neighbor-joining analysis based on ITS sequences. Bootstrap percentages (1000 replicates samples) are shown above branches. Scale bar = 0.02 substitutions/site.
    Phylogenetic tree of selected taxa obtained from neighbor-joining analysis based on ITS sequences. Bootstrap percentages (1000 replicates samples) are shown above branches. Scale bar = 0.02 substitutions/site.
  • [Fig. 4.] Phylogenetic tree of selected taxa obtained from maximum-likelihood analysis based on ITS sequences. Bootstrap percentages (1000 replicates samples) are shown above branches. Scale bar = 0.02 substitutions/site.
    Phylogenetic tree of selected taxa obtained from maximum-likelihood analysis based on ITS sequences. Bootstrap percentages (1000 replicates samples) are shown above branches. Scale bar = 0.02 substitutions/site.