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I read a book in the 1970s that was on Earth and plants had reclaimed the land. It had creeper like plants that had reached the moon, oaks trapped its victims using cages so it could live off the waste of the creature before it died. A fungus would drop from trees onto peoples heads which took them over or enhanced there thinking as in the case of the heroes.
The only other part of the story that I remember was that the women were the dominant sex and would express their dominance by urinating on the ground and the heroes/heroines in the book climbed the creepers to the moon.
Does it ring a bell with anyone? I would like to find a copy if possible.