These popped up last weekend underneath some peonies which were planted about 7 years ago, and are under an olive tree. This is the first time we've seen them. We are curious as to their origin, as we have imported nothing to the area since the peonies, which were dug up from an old house in nearby Auburn, CA. The only organic matter around is olive and peony litter. 5-sided, squared off 'stipe', fused, chambered arms, and coral-pink color.