Didymodon icmadophilus in the Neath Valley

I've not yet checked my specimen under the microscope, but what I've been calling D. icmadophilus (as recommended by Tom Blockeel) was present in good quantity on wavy concrete-block paving at Aberpergwm.  I'm not quite sure what is happening taxonomically with acutus and icmadophilus, as the map on the NBN appears to show records for these taxa amalgamated under the latter name.  If any anyone can shed any light on what's going on I'd be grateful, just so I can enter my records under the correct name.  D. acutus at Merthyr Mawr to me looks quite different to D. icmadophilus I've seen at anthropogenic sites in West Glamorgan.

For ref,  the list of associates on the blockwork was as follows:

Barbula convoluta var. convoluta Barbula convoluta var. sardoa Barbula unguiculata Bryoerythrophyllum ferruginascens Bryum capillare Bryum dichotomum Bryum pallens Bryum pallescens Calliergonella cuspidata Cephaloziella cf. hampeana Ceratodon purpureus Dicranella varia Didymodon cf. australasiae Didymodon fallax Didymodon ferrugineus Didymodon icmadophilus Didymodon insulanus Encalypta streptocarpa Hypnum cupressiforme var. cupressiforme Pseudocrossidium hornschuchianum Trichostomum crispulum