Division of Mathematics, Science, and Engineering, Hartnell College, 411 Central Ave., Salinas, California, 93901, USA.
School of Biological Sciences, Queen's University Belfast, 97 Lisburn Rd., Belfast, BT9 7BL, UK.
J Phycol. 2019 Jun;55(3):503-508. doi: 10.1111/jpy.12860.
Current usage of the name Ulva lactuca, the generitype of Ulva, remains uncertain. Genetic analyses were performed on the U. lactuca Linnaean holotype, the U. fasciata epitype, the U. fenestrata holotype, the U. lobata lectotype, and the U. stipitata lectotype. The U. lactuca holotype is nearly identical in rbcL sequence to the epitype of U. fasciata, a warm temperate to tropical species, rather than the cold temperate species to which the name U. lactuca has generally been applied. We hypothesize that the holotype specimen of U. lactuca came from the Indo-Pacific rather than northern Europe. Our analyses indicate that U. fasciata and U. lobata are heterotypic synonyms of U. lactuca. Ulva fenestrata is the earliest name for northern hemisphere, cold temperate Atlantic and Pacific species, with U. stipitata a junior synonym. DNA sequencing of type specimens provides an unequivocal method for applying names to Ulva species.
目前，绿藻属的模式种 U. lactuca 的使用情况仍不确定。对 U. lactuca 的林奈氏模式标本、U. fasciata 的副模式标本、U. fenestrata 的模式标本、U. lobata 的模式标本和 U. stipitata 的模式标本进行了遗传分析。U. lactuca 的模式标本在 rbcL 序列上与暖温带至热带种 U. fasciata 的副模式标本几乎完全相同，而不是通常应用于该名称的冷温带物种。我们假设 U. lactuca 的模式标本来自印度洋-太平洋地区，而不是北欧。我们的分析表明，U. fasciata 和 U. lobata 是 U. lactuca 的异名。U. fenestrata 是北半球、冷温带大西洋和太平洋物种的最早名称，U. stipitata 是一个较年轻的同义词。对模式标本的 DNA 测序为将名称应用于绿藻物种提供了一种明确的方法。
