I'm pretty sure than none of the other ones that form from an "egg" have the gelatinous part between the outer and inner so its worth remembering where they sprout up (fairly easy in your garden then) and with luck you can catch them before they sprout up next year. Also if you see one that's sprouted there's often another nearby that hasn't got out of the egg stage and at that point they really are OK. I take the outer skin off, scrape the gelatinous part off (that part feels a bit manky and sticky) then cut the inner in half.
After that I know what I'm dealing with.
Here's another I picked and ate.
Straight after finding.
After part removal of outer skin and showing the gelatinous part that I think later becomes the stinky topping to the head, get rid of this part before it becomes stinky cos it really can stink then. Plus it feels pretty manky.
Cross section showing part of the gelatinous part and the inner hard part. Bit like a little nut.
After scraping the gelatinous part off and ready for eating. I eat the greyish/brownish part and the white very centre part.
If I read it right its called the receptaculum.
Again from the cut side.