Jochen -
Thanks. It's a pity there isn't such a site!
I have a copy of Bruck's book, and the diagrams are pretty
good, though as it says, not all tree
types are shown - not even all the common ones.
The original design for this coin
type must have specified a tree and a hut, but the trees and huts as produced varied from place to place. This seems odd, because there is evidence elsewhere that mints received a coin to copy, not just a design or a description. But there it is. Perhaps, this time, they didn't. Or, perhaps there were instructions to make it seem real to the locals.
So the trees (and huts) as drawn on the coins could be at least two things. They could be depictions of locally known trees that suit the overall design; or they could be local engravers' ideas of the trees that grow in the locality that the design is supposed to represent. (Or: the locality where, in the common view of local people, this scene could take place.)
So there is a lot of scope for variation and invention, but I do agree that some of the trees are identifiable. I think one of the
Alexandria types - which usually looks a lot like Bruck's diagram - is a fig, with fruits at the end of its branches. The common
Nicomedia type looks like an ash.
I am afraid the
Treveri trees do not really resemble oaks. I'm not all that familiar with olives, but I am not convinced by that idea either, really. But I appreciate the attempt to find a match.
As to the idea that most of them resemble laurel, I think the
German Forum members have more imagination than the coin engravers ..
There are photos of all of the
types on my hut coin pages. Here are an Alexandrian probably-a-fig, and a
Treveri definitely-not-an-oak, as examples.