I was particularly hoping to relocate two calcicoles recorded by Barry which I'd never seen: Scorpiurium circinatum and Didymodon umbrosus.
The Scorpiurium proved easy to find and was fairly frequent around the base of the cathedral walls on the northern, southern and eastern aspects. It also occurred on some low walls nearby, as in the pic below.
The Didymodon was a different matter - I thought I'd failed to find it, but on checking my samples at home I did find a couple of tiny stems which could, perhaps, be this species - see photos below. It looks fairly similar to Barry's photo from 2013, but it seems to lack the basal hyaline cells mentioned in Smith so I think it must be something else (not just a wretched Schistidium I hope!).
The cathedral walls also added two species for the tetrad: Tortella tortuosa and Pseudocrossidium revolutum.
I then had a look at the graveyard, which added eight more species for the tetrad including Cirriphyllum piliferum, Didymodon tophaceus, Brachythecium populeum and Homalothecium lutescens.
|Llandaff cathedral graveyard|
|Grave supporting Zygodon conoideus|
|Zygodon conoideus on gravestone, mixed with Frullania dilatata|