As the subject says, IF this can be foraged in Gyrospire Beza, it's either extremely rare or you have to be some special location. I foraged there for a while and only got Clockwork Grease. Coal Dust, Pile of Rust, Phosphorescent Goop, Pod of Water, Roots and Rusty Gears. If your specifically targeting the 'shroom - go to Hills of Shade.
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Aanuvane Bristlecone 350 Baking, Brewing, Jewelry Making, Tailoring, Blacksmithing, Fletching, Pottery, Research, 250 Fishing Muertenie Petitmort 350 Master Tinker Kadcea 350 Master Alchemist Orelinde 350 Master Poison Maker Kynsh/Rabon/Atracker and a whole host of additional alts Povar via Quellious via Rodcet Nife
I was able to forage 5 of these in relatively short order in the mushroom area in HoS. Put my Innate Cammo on my Ranger (85) and just stood on a small hilltop. Good luck!