Belfast Botanic Gardens Tree Archive

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This is one of a series of short articles about trees in the Belfast Botanic Gardens compiled by the Friends group. The tree tag number relates to the small aluminium discs, usually fixed on the tree trunk, 2 to 3m above ground level.
Fagus sylvatica var heterophylla 'Asplenifolia'
Fern-leaved beech

(also in print as F. sylvatica 'Heterophylla' and F. sylvatica 'Asplenifolia')


Tag 333/334
54 deg 34.887N
5 deg 55.945W

The fern-leaved beech is a variety or sport of the common beech. It makes a large tree to 25m as the two fine examples in the Belfast Botanic Garden show. The leaves are very variable, but always more dissected than those of the species. Fern-leaved beech is said to commonly produce some normal beech leaves, although the Botanic Gardens trees don't seem to show this characteristic.On the tips of branches some leaves may be very narrow and linear almost like a willow leaf whereas other leaves may look more like an oak leaf - see below. The flowers are the same as the species and bark is smooth and silvery grey also like the species. According to some authorities the fern-leaved beech is a chimaera; that is it combines the tissues of two different plants without being a true genetic hybrid of the two. Usually the inner tissues are of one and the outer tissues are of another - in this case the inner tissues are of the true beech and the outer tissues are of the sport.

NOTE since this was written in 2009, one of the two trees has succumbed to the heart-rotting fungus Ganoderma. Internal imaging of the trunk showed that the tree was partially hollow. In a woodland situation trees with hollow centres may survive for several hundred years, but in a public garden safety issues meant that the tree had to be removed in 2019. The remaining tree remains sound and efforts are underway to propagate from this.

Fern leaved beech in Belfast Botanic Gardens

Fern leaved beech, branches

One of two large fern-leaved beeches feathery branches of fern-leaved beech

Fern leaved beech - leaf shape

Fern leaved beech leaf shape

typical leaf of fern-leaved beech leaves from branch tips of fern-leaved beech

Fern leaved beech - male

Fern leaved beech bark

Male flowers of fern-leaved beech Trunk of fern-leaved beech

Photos taken in Belfast Botanic Gardens in 2009. Copyright: Friends of Belfast Botanic Gardens.

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