The two New Zealand species are large shrubs or trees, from tall. Both trees can be
epiphytic or
hemiepiphytic. The young tree often colonizes amongst other
epiphytes like
Collospermum and
Astelia high in the forest canopy, before growing aerial roots down the trunk of its host. Upon contact with the ground, the roots can become large – up to thick, and are easily identified for their heavy lengthwise corrugations.
G. lucida rarely becomes a freestanding tree if having begun life epiphytically, and can often be seen to have collapsed where the host has died. Epiphytic growth in
G. littoralis is less common, but does occur in wetter climates. The vernacular names are of
Māori origin. •
G. littoralis – Kapuka; leaves long. •
G. lucida – Puka, akapuka, shining broadleaf; differs from
G. littoralis in larger leaves, to long. ==South American species==