Journal
PHYCOLOGICAL RESEARCH
Volume 57, Issue 2, Pages 94-103Publisher
WILEY
DOI: 10.1111/j.1440-1835.2009.00525.x
Keywords
molecular phylogeny; morphology; rbcL; taxonomy; Ulva; Ulva limnetica
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Funding
- Ministry of Education, Science, Sports and Culture [17687007]
- Salt Science Research Foundation [0714]
- Grants-in-Aid for Scientific Research [17687007] Funding Source: KAKEN
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Ulva limnetica Ichihara et Shimada, sp. nov. (Ulvales, Ulvophyceae) is described from the Ryukyu Islands, Japan, and is characterized by thalli that are: (i) branched, tubular, fragile and wrinkled; (ii) up to 80 cm in height and up to 2 cm in diameter; (iii) light to yellowish green in color; and (iv) having an asexual reproduction by means of quadriflagellate swarmers. Rhizoidal cells bear tubular extensions on the outside of the cell layer in the stipe. Ulva limnetica is distinguished from species with similar thalli by chloroplast disposition, branching pattern, number of pyrenoids per cell and gross morphology. It is also distinguished by sequences of the nuclear-encoded 18S ribosomal RNA gene, internal transcribed spacer 2 region and the plastid-encoded large subunit of ribulose-1,5-bisphosphate carboxylase/oxgenase gene (rbcL). Ulva limnetica was clustered with other Ulva species in an early diverging lineage within the genus.
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