| 1970, Oct | Present |
J.M.Chalmers-Hunt |
Not recorded |
Grwyne Fawr |
SO2822 |
Unknown |
Not recorded |
| | 1990, Sep | Present |
J.R.Langmaid,A.M.Emmet,P.H.Sterling&N.R. Lowe |
Mine (vacated) |
Waun-y-mynach |
SO0929 |
Daytime observation |
Not recorded |
several | | 1990, Sep | Present |
N.R.Lowe |
Not recorded |
Waun-y-mynach |
SO094297 |
Unknown |
Not recorded |
| | 1992, Sep | Present |
N.R.Lowe |
Not recorded |
Craig Cerrig-gleisiad NNR |
SN9622 |
Unknown |
Not recorded |
| | 2004, Sep | Present |
J.R.Langmaid&N.R.Lowe |
Mine (vacated) |
Corngafallt |
SN9364 |
Daytime observation |
Not recorded |
a few Betula | | 2004, Sep | Present |
J.R.Langmaid&N.R.Lowe |
Mine (vacated) |
Pont-ar-dulas |
SN945532 |
Daytime observation |
Not recorded |
a few Betula | | 2005, Sep | Present |
J.R.Langmaid |
Mine (vacated) |
Talybont Forest |
SO0617 |
Daytime observation |
Not recorded |
a few Betula | | 2005, Sep | 1 |
J.R.Langmaid |
Mine (vacated) |
Buckland Hill,Bwlch |
SO1421 |
Daytime observation |
Not recorded |
Betula | | 2006, Aug | Present |
J.R.Langmaid |
Mine (vacated) |
Garwnant Visitor Centre |
SO0013 |
Daytime observation |
Not recorded |
a few Betula | | 2006, Aug | 1 |
J.R.Langmaid |
Mine (vacated) |
Buckland Hill,Bwlch |
SO1421 |
Daytime observation |
Not recorded |
Betula pubescens |
|