@ARTICLE{TreeBASE2Ref16886, author = {Charles J. O'Kelly and Wendy K. Bellows and Brian Wysor}, title = {Phylogenetic position of Bolbocoleon piliferum (Ulvophyceae, Chlorophyta): evidence from reproduction, zoospore and gamete ultrastructure, and SSU ribosomal RNA gene sequences.}, year = {2004}, keywords = {}, doi = {}, url = {}, pmid = {}, journal = {Journal of Phycology}, volume = {40}, number = {}, pages = {}, abstract = { Aspects of the reproduction of Bolbocoleon piliferum N. Pringsheim, a common, small, filamentous, endophytic marine green alga, were examined by light and transmission electron microscopy. These observations were combined with phylogenetic analysis of nuclear-encoded SSU rRNA gene sequences to assess the phylogenetic position of B. piliferum. Quadriflagellate zoospores and planozygotes derived from fusion of isogametes yielded plants with identical morphology. Zoosporangia and gametangia divided by sequential cleavages. Plugs at the apices of zoosporangia and gametangia formed during development; tubes were found at zoosporangial and gametangial apices after swarmer release. Flagellar apparatuses of zoospores and gametes were similar to those of algae in the Ulvales (Ulvophyceae), except that terminal caps were entire rather than bilobed, and rhizoplasts and stacked microtubular root configurations were absent. Structures associated with planozygotes were identical with those observed in other algae currently assigned to Ulotrichales and Ulvales. Molecular phylogenetic analyses placed B. piliferum within the Ulvophyceae, at the base of a clade that contains representatives of the families Ulvaceae, Ulvellaceae and Kornmanniaceae. The results support an earlier hypothesis that B. piliferum constitutes a distinct lineage. Analyses including Kornmanniaceae recover monophyletic Ulotrichales and Ulvales, whereas analyses omitting the Kornmanniaceae indicate that Ulotrichales is paraphyletic. The structures associated with gamete fusion are conserved within Ulotrichales and Ulvales, and perhaps more widely within Chlorophyta.} }

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