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Archegonium with a slender persistent style, solitary on a usually very short branch; the perianth free from the involucral leaves, oval or oblong, terete or angular, variously carinate, cristate, or ciliate.

Nearly 300 species are Australian or Polynesian, and have terete or vertically compressed leaf stalks, instead of the bipinnate leaves of the much fewer species of America, Africa, etc.

A. cylindricum and A. Vandarum have terete leaves like Vanda teres, the former with white flowers, having a fleshy yellow and red lip, and the latter, which is more membraneous in substance, being white.

In consequence of this it is said to be terete.

Plasmodiocarp terete, elongated, flexuous, creeping, and reticulate, irregularly dehiscent; the wall a more or less thickened membrane, externally naked, with the granules of lime on the inner surface.