Table 1.

External characteristics of the different Ulva species recognized on Los Tubos beach, Algarrobo Bay, Chile.

Character	Ulva stenophylloides (morph 2)	Ulva uncialis (morph 4)	Ulva compressa (morph 100)	Ulva aragoensis (morph 200)
Color	Intense to light green	Dark green	Light green	Light green
Thallus shape	Laminar foliosus	Laminar foliosus	Cylindrical	Cylindrical
Texture	Smooth and thin	Smooth and thick	Smooth and thin	Smooth and thin
Algae edge (upper)	Smooth and undulated	Smooth	Smooth	Smooth
Seaweed edge (middle)	Smooth and undulated	Wavy	Smooth	Smooth
Seaweed edge (basal)	Smooth and serrated	Toothed and with excrescences	Smooth	Smooth
Disk shape	Round	Round	Round	Round to irregular
Perforations in the fronds	Present	Present	Absent	Absent