Thalloid Red Algae - Hildenbrandia rubra

I found these red spots on various rocks in the low tide zone. I think they might be Hildenbrandia rubra.

Habitat: Intertidal zone during low tide

comments (7)

Ferdy Christant

Lion

Did some generic searching but no luck! Also got scared from that shark reflection in the water. Posted one year ago
1. Christine Young
  
  Lion
  
  Thanks! I felt like I could hear the music from the movie Jaws the entire time. Although, that could have been Dave heckling me. Posted one year ago, modified one year ago
2. 1. Patomarazul
    
    Lion
    
    I will check later a guide I have for your area to see if I can get info on this, no promises :-)
    Posted one year ago
  2. 1. Patomarazul
      
      Lion
      
      I could not find it in my book. My guess is that is either bacteria or algae colonies..
      If you have access to them gain, maybe next time bring back home a sample to watch it under the microscope (if you still have one?). I am curious so if you do it let us know :-) Posted one year ago, modified one year ago
    2. 1. Christine Young
        
        Lion
        
        Thanks for checking! I should have collected a sample. Posted one year ago
      2. Patomarazul
        
        Lion
        
        Well, I'm sure there will be a next time ;-) Posted one year ago
        
        Christine Young
        
        Lion
        
        I found a lead for the ID -- they might be Hildenbrandia rubra. Posted one year ago

The Hildenbrandia rubra

''Hildenbrandia rubra'' is a marine species of thalloid red alga. It forms thin reddish crusts on rocks and pebbles in the intertidal zone and the shallow subtidal zone. It is a common species with a cosmopolitan distribution, and is able to tolerate a wide range of conditions.

Info 1 0

Similar species: Hildenbrandiales

Species identified by Christine Young