Key to the species of Ulva

1 Plants reticulate, netlike nature obscuring blade, mostly unattached entangled with other algae U. reticulata
1 Plants not reticulate, clearly blade like, mostly attached 2
2 Individual plants with conspicuous narrow segments 3
2 Individual plants with blades broad, rounded U. expansa
3 Basally broadened, but upper portions divided deeply into many ribbon like segments; margins smooth, often undulate U. fasciata
3 Basally narrowing to a stipe up to 5 mm long, frond narrow, attenuate blades rarely divided, with strongly ruffled margins U. taeniata

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