补充:这个珍稀描述并不是英国普遍公认的,不同的专家在其专著中对珍稀度有不同划分。
这里列举几种其它权威的珍稀度划分:
Micheal Gouby:
A1– Abundant
C2 – Common
N3 – Normal
S4 – Scarce (201-500)
R5 – Rare (101-200)
R6 Very Rare (51-100)
R7 – Extremely Rare (26-50) R8 – 10 to 25 possibly known
R9 – 2 to 9 possibly known
PU – possibly unique
Peck:
EXC – excessively common
EC – extremely common
VC – very common
C – common
S – scarce
VS – very scarce
R – rare
VR – very rare
ER – extremely rare
EXR – excessively rare
PU – probably unique