*1: Hayle causeway,
1837, JR (PNZ) (Paton 1969a:
*2: Looe, 1886, RVT
(B) (Paton 1969a: 725).
Forms low lawns or smaller patches or tufts. Notes
on habitats from C&S are as follows. A calciphile that
grows on old masonry (mortar, concrete, asbestos-cement
roofing material), on thin soil layers over masonry, and on
calcareous sand, less often on other basic soils or on rock.
It grows on free-draining horizontal, sloping or vertical
surfaces. Most often it is fully insolated, sometimes even
growing on exposed cliff tops, but it is also common in
sheltered locations and it sometimes tolerates considerable
shade (e.g. in old Grey Willow scrub, among ruined buildings,
in road cutting and beneath a railway viaduct). Recorded from
tops and sides of walls, building rubble, masonry fragments
lying on ground and on graves. Also locally frequent with
other low mosses in partly bare patches and areas with very
short vegetation on fixed dunes and in short dune-grassland,
and recorded in similar habitats on sandy soil of coastal
hillsides and on a cliff top. Fewer records also from amongst
stony mine-spoil, a soil heap, soil of paths and tracks, ledge
of granitic rock in disused quarry, vertical slaty rock of
road cutting and on thin soil over slate/shale rock of
quarried cliff beside estuary. Three records from silted bases
of trees in flood-zone of R. Tamar, one of large patch of very
well-grown plants. Frequent associates include Barbula convoluta, Didymodon insulanus.
Others recorded include Bryum
Commonly c.fr.: capsules immature 1-3, 6, 9-12;
dehiscing 1-3, 10-12; dehisced 1-8, 10-12.