Ulva intestinalis Linnaeus
Hollow green nori
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Family:  Ulvaceae ()
Max. size:  20 cm H (male/unsexed)
Environment:  sessile; marine; depth range 0 - 20 m
Distribution:  Arctic, Indo-Pacific, Atlantic Ocean, Mediterranean and Black Sea. Subtropical to polar.
Diagnosis:  Thalli bright to yellowish green. Several unbranched tubular branches arise from a short stipe; discoid holdfast. Erect branches tapering below, inflated above and constricted or contorted at certain points. Cells polyhedral in surface view, irregularly arranged and filled with spherical to oval chloroplasts.
Biology:  Grows on rocky substrate in the lower intertidal to shallow subtidal zones or in shallow tidepools exposed to air during low tide (Ref. 80758); also considered as a fresh sea-vegetable (Ref. 82232). Inhabits rocky substrate in the lower intertidal to shallow subtidal zones or in shallow tidepools exposed to air during low tide (Ref. 80758). Also found in supra-littoral pools that are influenced by wave splashes (Ref. 83307) as well as sandy areas where rock attachment is possible (Ref. 801).
IUCN Red List Status: Not Evaluated (N.E.) Ref. 123251)
Threat to humans:  harmless
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