Leucodon is scattered across most of the left hand end of the roof, with abundant 5-10 cm patches across a 3x3m area. When I first noticed it in 2008 the patch was denser but a bit smaller (I described it as a 1m wide strip down the height of the roof). The shoots are pretty big, about 2-3 cm long, and might well fit 'var morensis'. Some shoots hold abundant axillary branchlets.
Anyway, it's always worth a look on asbestos roofs if you can reach them legally.