[1] Brasilicereus phaeacanthus typically grows with shoots that branch from the base, standing upright but sometimes leaning or climbing.

The shoots are 4 to 9 centimeters in diameter and can reach up to 4 meters in height.

The plant has 8 to 13 low, narrow ribs covered with whitish wool in the areoles.

[2] Brasilicereus phaeacanthus is native to the Brazilian state of Bahia.

[4] The specific epithet phaeacanthus derives from the Greek words phaios (gray) and akanthos (thorn), referring to the plant's thorniness.