I just finished Raising the Stones by Sherri S. Tepper.'

Raising the Stones tells the story of the rise of the Hobbs Land Gods, some kind of fungus based group organism that creates a harmonious, productive society around it.  This comes about on Hobbs Land, an agricultural settlement planet in a under-defined solar system with many planets, connected by teleporting "Doors".  This harmonious society comes into conflict with the Voordsteders, a repressive patriarchal society meant to be derived from the remnants of the Judeo-Christian/Islamic beliefs.

Set in the future of the same universe as Grass,  this isn't really a sequel since it neither involves any of the same characters or follows directly from the events of Grass.  It's a very well told story, though the overly strong patriarchal versus matriarchal themes were a distraction.