Elm ID?

[agg221]

Bark can be a useful part of the whole but elm morphology is complex. Richens' papers of the '50s to '70s provide the best guide to consistent features and how to interpret them but he eventually concluded that in regions where different strains are present you end up with a continuum of features. This supports the view of strains of a common species (U.minor) rather than distinct species. Hence the need for multiple feature analysis.

 

I don't fancy trying to measure Ra on an elm leaf - I don't fancy trying to get a baseline!

 

Alec

[daltontrees]

Cpuld someone please explain what 'Ra' is?

[Mick Dempsey]

Well if I didn't, someone else would.

[agg221]

Hi Jules

 

Ra = Roughness average and is the measurement of surface roughness measured in micro-metres or micro-inches. It is an engineering thing and I'm not too sure how it could be applied to a tree.

 

Ed

 

That about covers it - not very applicable to trees which is why I wasn't sure why the op mentioned it:confused1:

 

Alec