This species is dark green and unattached being typically tangled in other algal species in low to mid intertidal pools (Featured image), as well as subtidal. The cells are 90-110 µm wide and 100-200 µm long; the cells square to slightly rectangular (length to width ~1-2:1) (Image A). Chloroplasts form a parietal reticulate network and multiple pyrenoids are evident (Image B).
The genus Chaetomorpha requires significant taxonomic work in the local flora. We have no genetically verified records to date, and this species is presented here based on a morphological identification (Sears 2002) for a collection from the Bay of Fundy, NB. Possibly confused with Rhizoclonium spp. (e.g. Rhizoclonium tortuosum (Dillwyn) Kützing) in the NW Atlantic, species of that genus typically have thinner filaments, as well as fewer larger pyrenoids in their chloroplasts.
Image A. Whole mount displaying the vegetative cells (mid intertidal pool tangled in other algae, Lepreau exposed biodiversity site, NB; GWS045844).
Image B. Whole mount displaying the parietal network of chloroplasts with pyrenoids (GWS045844).