Acer palmatum viride is the type...ie it is an Acer palmatum with green leaves.
There are 100's of specially named ones Acer palmatum with dissected leaves, filigree leaves, purple leaves etc ...but they tend to be much slower dwarf trees. To have a tree that size it will not be one of the fancy named hybrid/cultivars.
Special trees are virtually always grafted. There are over 1,000 named cultivars.
We used to live 10 miles away from Newport and collected many many named Acer palmatum and Acer sp. I am not completely ignorant about Acers.
However, you obviously don't agree...... so if you want expert advice then I recommend you go to The Maple Society forum in UBC... there are experts there world wide. ..
You will find some of my pics posted there in the A _ Z photo library.
"In addition to the cultivars described above, a number of cultivar groups have been naturally selected over time to such an extent that seedlings often resemble the parent. Many of these are sold under the same name as the cultivars, or even propagated by grafting, so there is often much ambiguity in distinguishing them.In particular, a number of dark-red Acer palmatum are sold with the names ‘Atropurpureum’ and ‘Bloodgood’. Many different cultivars with delicate lace-like foliage are sold under names such as ‘Dissectum’, ‘Filigree’ and ‘Laceleaf"
Tall trees
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Thanks
Gareth
https://www.google.com/search?q=acer+palmatum+westonbirt&client=firefox-b-d&channel=crow&source=lnms&tbm=isch&sa=X&ved=0ahUKEwilmLPEurLkAhVTQUEAHcpJA3AQ_AUIESgB&biw=1920&bih=944
There are 100's of specially named ones Acer palmatum with dissected leaves, filigree leaves, purple leaves etc ...but they tend to be much slower dwarf trees.
To have a tree that size it will not be one of the fancy named hybrid/cultivars.
There are over 1,000 named cultivars.
https://forums.botanicalgarden.ubc.ca/forums/acer-palmatum-cultivars-photos.208/
Quote wiki....
"In addition to the cultivars described above, a number of cultivar groups have been naturally selected over time to such an extent that seedlings often resemble the parent. Many of these are sold under the same name as the cultivars, or even propagated by grafting, so there is often much ambiguity in distinguishing them.In particular, a number of dark-red Acer palmatum are sold with the names ‘Atropurpureum’ and ‘Bloodgood’. Many different cultivars with delicate lace-like foliage are sold under names such as ‘Dissectum’, ‘Filigree’ and ‘Laceleaf"
Tall trees posted on another forum ..identical question.