Phylum: Basidiomycota. Class: Agaricomycetes. Order: Agaricales. Family: Tricholomataceae
Grey Ghosts or Grey Knights as Tricholoma terreum is variously known are a common mushroom on edges of our local Pine forests where big flushes, or at least reasonable sized groups of them, can be found. I’ve been stepping over and around them for ages, having identified them as the nearly identical and toxic Tricholoma virgatum. However, this year, some folks in online mushroom groups have been posting about finding and eating them. I live and learn!
They start with grey caps but as the age, the caps split to expose the white flesh. Grey Ghosts have a pleasant smell, distinguishing them from Ashen Knight Mushrooms (T. virgatum) which smell unpleasant, peppery or some folks would say radishy. I can’t confirm this myself, having never knowingly encountered one.
There has been much talk of dangerous toxins being found in T. terreum and relatives, but the amount needed to be eaten to be poisoned seems to be kilos over several days. I’ll give you the link here to an article in Chemistry World that goes into more detail so you may make up your own mind. For now, We only recommend eating a couple at a time, if at all.