I get mushrooms in some of my potted plants I keep in our glass solarium and some of them look like that. Usually, they shrivel up into grown husks, often within a day or two of growing. I've never worried about them, and my cats have never bothered them. I recognize that this is merely anecdotal evidence, however, so probably not helpful. ;-)
Fascinating! (For me, also the name, as it's German in origin - birnbaum = pear tree ^^ - it has the colour of one of our most typical pear varieties, perhaps for that reason)
Thank you! That's exactly how mine appear as well. I'll make a point of digging them out and disposing of them next time they appear in my greenhouse pots!
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https://plants.ces.ncsu.edu/plants/leucocoprinus-birnbaumii/
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