Vine like moonlight cactus

Description

Stems scandent, clambering or sprawling, branching, producing aerial roots, stiff, to 1-2(-5) m long, 2-3 cm thick; ribs 4-6 or more, later terete, acute; areoles 1,5-2 mm on -, reddish brown at first, later greyish brown, internodes 1,5-2,5 cm; spines 6-8, 1 mm long, acicular, white or yellowish, later blackish, radial spines 5-6 central spines 1-2, basally 0,25 mm in - above the swollen bases, apically attenuate-conical, circular in cross section, the bulbous bases 0,5 mm in -, hairlike spines none; epidermis light green, somewhat shining. Flowers produced from areoles near tip, 8-14 cm long, 7-8,5 cm in -, nocturnal but stays open for 2 2-3 days (John Ellis, UK), tepals rotate; pericarpel covered with spines, but no hairs, bracteoles small,