Brongniartella byssoides (Goodenough & Woodward) Schmitz [1](Vertebrata byssoides)[2] is a small red marine alga.

Brongniartella byssoides is a small brownish-red marine alga which grows to a length of about 30 cm.

The erect axes are polysiphonous, that is each axes is composed of axial cells each covered with periaxial cells without cortication.

[1] The plants are attacked by rhizoids with disc-like bases.

[2] The species is dioecious, the sexes occur on separate plants, with clusters of spermatangial branches, sessile cystocarps and tetrasporangia.