Polysiphonia pacifica Hollenberg
Annotated by G.J. Hollenberg. Remarks: Your Polysiphonia no. 847 certainly has most of the features of P. sonorensis. However the locality, the color of the plant and the lack of fruiting lead me to the conclusion that for the present we had best consider it a form of P. pacifica. The manner of branching at the tip is very suggestive of the latter species, and you will note that I had previously recognized that sometimes some of the more delicate forms of this plant may bear trichoblasts. I hope you can find fruiting material of this plant.

Oregon: Coos: Coos Bay.
43.402572° N, 124.220092° W,
Datum: WGS 84. Coordinate Source: Digital Map.
Other portion of letter on Antithamnion #845. Https://oregonflora.org/collections/individual/index.php?occid=4685952.

J.F. Chadwick 847, 1949-7-22
With Jr.
OSC, Catalog: OSC-A-016039