The Grey barked elm, Zelkova serrata, is known in Japan as Keaki . The Zelkovas are a small genus of small trees allied to the Ulmus or Elms. Z. serrata is really one of the classic deciduous bonsai subjects of Japan.
It is native to the far east and was introduced into the UK in 1861. It acclimatises well to our conditions and as it’s classic status suggests has very good bonsai characteristics.
This example was almost certainly grown in this country rather than imported from Japan. Whilst the typical style for the species may be Broom, this one is more on an informal upright. Across the base the trunk measures 6cm. in diam. The height is 50cm. with branches spreading to 45 cm. The pot is a Chinese glazed ceramic oval 35x28x7cm.