Observations by bclarkston

Drift specimen, but common on rocks in mid-intertidal.
No holes, highly-ruffled blade. Very thin, suspect one cell thick but didn’t confirm with microscopy. Second photo shows this Pyropia species on the bottom and a different species from the same class (Bangiophyceae) that is also very thin, but more red and less ruffled. Suspect the top species in the second photo is Wildemania.

Drift specimen, not common.
A red seaweed that appears quite brown, O. floccosa can be variable in morphology and hard to ID. This specimen is branching alternately and the branches lay flat (are in one plane).

Drift specimen, not common.
Brown seaweed, hollow tube, unbranched, with frequent constructions. Length ~ 25cm.
Think it fairly likely this is S. lomentaria because of the constrictions and published DNA barcode data for the area.

Drift specimen, uncommon.
Has midrib, many puckered holes over the blade. Body quite deteriorated so colour is off and both stipe and holdfast lost. However, I’ve seen several other specimens at this beach that have the finger-like projections from the stipe or “fimbriations”.

Drift specimen, quite common. Body deteriorated, only a small portion of the blade left.
The papillae (bumps) had cystocarps, often 2-3 cystocarps per papillae. With this feature you can distinguish C. corymbiferus from the similar C. exasperatus.

Drift specimen, very common.
Branches “pinch in” where they join the main axis, are quite thick and terete. Much more turgid and noodle-like compared to the similar red seaweed Sarcodiotheca (see last photo).

Drift specimen, very common
Dark reddish brown, almost black
Irregular branching. Branches pinch in where they meet the main axis but the branches are not nearly as turgid and noodle-like as Sarcodiotheca (see last photo).

Drift specimen, very common.
Kye Bay Beach, Comox

Can be identified by the way it branches like a comb, with a series of four branches on one side of the main axis, then the branches switch to the other side of the axis. The first branch in the series of four is like a “thumb” (short, doesn’t itself branch so it looks like a little thumb).

The name in iNat is weird — this should be Plocamium pacificum. Plocamium cartilaginium is a separate species and there is no taxonomic entity called “Plocamium cartilaginium pacificum”.

Low intertidal, on rock.
Tetrasporophyte phase, tetrasporangia present.

Identified to C. gardneri because there are ecorticate (lacking cortication) region between nodes, branch apices are forcipate (crab-claw-like) and tetrasporangia appear to be in whorls around the main axis.

Taxonomic note: Used to be in the genus Ceramium (Ceramium gardneri), but was recently moved to the genus Campylaephora.

On rock, mid-intertidal.
Common, and lower down in intertidal than most Pyropia blades. Didn’t bring this one back to section, but a number of other similar blades were sectioned and had two cell layers (Pyropia has one cell layer).

Attached to small rock, upper intertidal. Both life phases present (upright and crust).
Probably Mastocarpus alaskensis because it is often found higher in the intertidal and has been DNA barcoded at this park, but staying conservative with this ID because Mastocarpus are quite variable.