This is a relatively common species in quarries and along forestry roads in the uplands of NPT, where it often grows with other pioneers species such as Ditrichum heteromallum, Pogonatum aloides, Pogonatum urnigerum, Diplophyllum albicans, Nardia scalaris and Solenostoma gracillimum. Most colonies are barren, but very occasionally we see it in fruit.
Oligotrichum hercynicum in fruit, Bwlch Forest
It is a conspicuous, vivid green moss, difficult to miss and the rather local distribution pattern indicated by current records in the database may be misleading. My guess is that it is scattered throughout the coniferised uplands of VC41, so it's worth targeting in the coming season. Perhaps its apparent absence from Gower is real, or a challenge for Barry!
Distribution of Oligotrichum hercynicum in Glamorgan (Map Mate records, 1km squares)
And while we're on the subject, Ditrichum heteromallum also appears to be rather local or perhaps under recorded in VC41 and apparently absent from Gower. Now is a good time to see it in fruit, which makes its identification a bit easier (at least for me).
Ditrichum heteromallum, Crynant Forest track (29/8/16)
Distribution of Ditrichum heteromallum in Glamorgan (Map Mate records, 1km squares)