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Hi Rupert
I am not expert so please accpet this with care!
I was told E. Tenax can be very variable. The one I saw last year https://www.flickr.com/photos/157476475@N03/51381449744/in/photolist-2mhpmUy
It doesn't look much like yours.
I looked at E. rupium on Steven Falk's Flickr page and it looks good for it.
https://www.flickr.com/photos/63075200@N07/sets/72157629446228274/
Yours, Gareth