Gelidium coulteri/pusillum

Gelidium coulteri

Habitat and Range 5

Found abundantly in the mid to low intertidal zone in dense mats or clumps on rocks or in tufts on mussel shells. Washington to Baja CA.

Source: Marine Algae of California (MAC)

Morphology and Identification 5

Gelidium coulteri is very similar to Pterocladiella capillacea except P. capillacea has broader and much more delicate branches which are often flatter and more regularly branched. The tips of the branches of G. coulteri are also more pointed.

Thalli found in thick clumps up to 10 cm tall (usually ~2-3 cm), occasionally taller in less exposed sites. Few major branches but with many distichous branchlets which are mostly equal in length. Apex is pointed and looks like a small arrowhead.

Source: Marine Algae of California (MAC)

Gelidium pusillum has been reclassified as Gelidium coulteri

Source: Boo, G.H., Hwang, I.K., Ha, D.S., Miller, K.A., Kogame, K., Cho, G.Y., Kim, J.Y. & Boo, S.M. 2016. Phylogeny and distribution of the genus Pikea (Gigartina, Rhodophyta) with special reference to P. yoshizakii from Korea. Phycologia 55(1): 3-11.

Sources and Credits

  1. Bryan Jason Quintero, no known copyright restrictions (public domain), uploaded by Bryan Jason Quintero
  2. (c) plocamium, some rights reserved (CC BY-NC), uploaded by plocamium
  3. (c) brihong, some rights reserved (CC BY-NC)
  4. (c) Gwen Noda, some rights reserved (CC BY-NC), uploaded by Gwen Noda
  5. (c) Sean Agler, some rights reserved (CC BY-SA)

More Info

iNat Map

Common name Algae, Red Algae
Region Government Point to Mexico, San Francisco to Government Point, WA Olympic Coast to San Francisco