Phylum: Rhodophyta
Class: Florideophyceae
Order: Hildenbrabdiales
Family: Hildenbrandiaceae
Genus and species: Hildenbrandia ruber (Sommerf)
- H. ruber growth on quartz bedrock
- Spotty coverage of rocks by H. ruber in the upper intertidal zone
Description: This plant exists as a thin encrusting layer on rock substrata. Its common name “rust spot” aptly describes this plants appearance.
Habitat: On rocks in the middle and upper intertidal zone, and on ship hulls.
Distribution: Most of Pacific Northwest
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