The blog Science Fiction and Other Suspect Ruminations examines two Doris Piserchia novels. Its review of Doomtime appeared on Amazon a while back and can be read here. (For some reason the uber-tree Tedron is spelled Tendron in the new version of the review.)

In addition, the blog features a review of A Billion Days of Earth:

"Doris Piserchia’s A Billion Days of Earth (1976) is a whimsical, disturbing, and stunningly inventive science fiction novel. This is the second and by far the best of her novels I’ve read (A Billion Days of Earth surpasses Doomtime (1981) in virtually every regard). Not only are the characters better drawn but the plot isn’t as easily derailed by repetitious actions. That said, she isn’t always the best at plotting but her imaginative worldscapes and bizarre creatures more than compensate."

The present blog greatly likes Doomtime and humbly disagrees with this assessment.