Midworld

Alan Dean Foster's "Midworld" is a good candidate in my opinion.

10 Possible Sources of "Avatar" in Classic Science Fiction 2010

The jungle planet of Midworld is covered with thousand-meter-high forests and untold number of unknown animal and plant life.

REVIEW: Forbidden Planets edited by Marvin Kaye 2006

I believe I could communicate just fine in Midworld, and I would LOVE to have some of the t-shirts and other items he mentions along the way – maybe they’ll be available someday – and, by the way, maybe there will be movies.

All Things Serve the Steam -and other odd notes deep_bluze 2004

Connected by, entangled with, and a part of the singular world-mind known as Midworld, the decorative vegetation on theTeacher was not about to allow the key to the only chance of stopping an immense oncoming cosmic evil to be terminated by a couple of zealot humans.

Flinx's Folly Foster, Alan Dean, 1946- 2003

As he passed through the living quarters 'relaxation chamber, with its tinkling waterfall, fountains, and aerial displays, the fronds and leaves of some of the decorative foliage from the edicted planet known as Midworld inclined in his direction.

Flinx's Folly Foster, Alan Dean, 1946- 2003

I just saw Avatsr today and the story reminded me mostly of Bova's "The Winds Of Altair VI" and of Alan Dean Foster's "Midworld".

10 Possible Sources of "Avatar" in Classic Science Fiction 2010

But, in my opinion, primarily from ADF's "Midworld".

Is James Cameron’s Avatar Actually an Uncredited Rewrite of a 1957 Poul Anderson Story? | /Film 2009

I don`t know Foster`s "Midworld" and doubt it could be of big literary meaning, because it seems to me that, in the seventies, there have not been written many literary important works, any more not even by Poul Anderson.

Is James Cameron’s Avatar Actually an Uncredited Rewrite of a 1957 Poul Anderson Story? | /Film 2009

Although the plot is extremely thin especially when it converts from historical to modern day urban fantasy, fans will enjoy meeting Susannah-Maliha and the worlds of Dakota Banks including eerie dark Midworld.

Dark Time-Dakota Banks « The Merry Genre Go Round Reviews 2009

Hans, "Avatar" "borrows" a GREAT deal from both a 1975 novel, "Midworld" by Alan Dean Foster, and 1957's "Call Me Joe" by Poul Anderson.

Is James Cameron’s Avatar Actually an Uncredited Rewrite of a 1957 Poul Anderson Story? | /Film 2009