List of Chromista by conservation status

, the International Union for Conservation of Nature (IUCN) has evaluated the conservation status of 15 species within Chromista. 
The IUCN has not evaluated any protist species other than those in Chromista. No Chromista subspecies or subpopulations have been evaluated. No evaluated Chromista species are confirmed to be extinct, but four are tagged as possibly extinct.
 the New Zealand Threat Classification System has evaluated 38 species of macroalgae as Threatened and 23 as Data Deficient. Some of these species are only of concern nationally.
IUCN evaluations.
Data Deficient.
All are brown algae (Phaeophyceae):