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 2 years 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 2 years ago, modified 2 years 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 2 years 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 2 years ago, modified 2 years ago
    2. 1. Christine Young
        
        Lion
        
        Thanks for checking! I should have collected a sample. Posted 2 years ago
      2. Patomarazul
        
        Lion
        
        Well, I'm sure there will be a next time ;-) Posted 2 years ago
        
        Christine Young
        
        Lion
        
        I found a lead for the ID -- they might be Hildenbrandia rubra. Posted 2 years 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