by Toby Hindson
These codes are fully discussed in two articles found in `Ancient Veteran and Notable - a new yew classification`. The articles are called Protocols 1 and Protocols 2.
Yews classed as Ancient must be 800 years old or more, with no upper age limit set to this category. If girth is above 7 metres a tree will be classified as Ancient. Many more of smaller girth will also be classified as ancient, and in these cases other codes will apply to that tree.
Yews classed as Veteran must be over 500 years old, and may be up to 1200 years old. A girth of 4.9 metres (16 feet) or more will usually apply.
A-g Girth above 7m
V-g Girth above 4.9m
A-fr V-fr Single fragment of original tree
A-frs V-frs Two or more fragments of original tree
A-hol V-hol Hollow shell, lack of roof to hollow interior, thin bole walls.
A-bm V-bm Large section of bole missing
A-reg V-reg Regrowth from stump
A-hsh V-hsh Horse shoe hollow
A-lgth V-lgth Shape suggests a once larger girthed tree
A-urn V-urn Urn shape, girth narrowest at ground, bulging upper bole
A-inp V-inp Position of internal stem implies yew was of greater girth
A-ins V-ins Size of internal stem implies age underestimated by bole girth
A-hist V-hist Historical references
A-hive V-hive Verbal history, confirmed
A-pg V-pg Previous girth measurements available
A-cgr V-cgr Current growth rates
A-rc V-rc Annual growth rings counted on a broken, cut or bored bole radius
A-smp V-smp A number of yews planted at the same time, one felled and ring counted
A-lay V-lay Proven natural layer(s) of an Ancient or Veteran yew
A-prop V-prop Cutting taken from a known Ancient or Veteran yew
A-hive V-hive Verbal history, confirmed by research
A-alt V-alt Allowance made for altitude and/or latitude
A-clif V-clif Yew growing in cliff
V-wild Growing outside a churchyard