15 research outputs found
Epithallial and initial cell fine structure in species of Lithothamnion and Phymatolithon (Corallinales, Rhodophyta)
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Occurrence of the red alga Thorea violacea (Batrachospermales: Thoreaceae) in the Hudson River, New York State
No full textVolume: 97Start Page: 328End Page: 33
Ultrastructure of Verdigellas peltata (Palmellaceae, Chlorophyta), a deep-water, palmelloid alga with ferritin and trilaminar sheaths
No full textDevelopment of epithallial cells in Corallina officinalis and Lithophyllum impressum (Corallinales, Rhodophyta)
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An unrecognized ancient lineage of green plants persists in deep marine waters
No full textWe provide molecular phylogenetic evidence that the obscure genera Palmophyllum Kutz. and Verdigellas D. L. Ballant. et J. N. Norris form a distinct and early diverging lineage of green algae. These palmelloid seaweeds generally persist in deep waters, where grazing pressure and competition for space are reduced. Their distinctness warrants recognition as a new order, the Palmophyllales. Although phylogenetic analyses of both the 18S rRNA gene and two chloroplast genes (atpB and rbcL) are in agreement with a deep-branching Palmophyllales, the genes are in conflict about its exact phylogenetic placement. Analysis of the nuclear ribosomal DNA allies the Palmophyllales with the prasinophyte genera Prasinococcus and Prasinoderma (Prasinococcales), while the plastid gene phylogeny placed Palmophyllum and Verdigellas as sister clade to all other Chlorophyta
