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The 2007 flora “Green Seaweeds of Britain and Ireland” did not present the molecular data underpinning the Ulvaceae treatment, mostly ITS sequences. Subsequently, names have changed as type material of  Ulva  species is sequenced and intensive sampling with DNA barcoding adds new European species. To update the Ulvaceae, we systematically sampled from 2007 to 2021, identifying specimens using various molecular markers alongside DNA from type material of four species. We show here that  Ulva gigantea , based on  rbc L,  tuf A and ITS sequences of its holotype, is assigned to  Ulva compressa , as is the lectotype of  Ulva curvata .  Ulva gigantea  sensu GenBank and  Ulva pseudocurvata  are conspecific. The correct name is  U. pseudocurvata  based on  rbc L sequences of the lectotype. Two species of monostromatic Ulvaceae were included in the 2007 flora, but we show that both of them and all earlier British monostromatic collections represent  Ulvaria splendens , a species originally described from Alaska. Analysis of two  rbc L amplicons of the  Ulva sordida  lectotype shows that it is conspecific with  Ulvaria splendens . Our first genuine collections of  Ulvaria obscura  from SW England and SW Wales correspond to topotype material from the Bay of Biscay, recent samples from Galicia and unpublished  tuf A sequences from Britanny.

Updating the Ulvaceae in the green seaweeds of Britain and Ireland