*1: Penzance, 1921, FR (BM)
(Paton 1969a: 724).
*2: St Lawrence,
Bodmin, 1882, RVT (B) (Paton 1969a:
724).
Grows as short lawns, dense low cushions or dense
patches. Notes on habitats in C&S are as follows. A
low-growing calcicole of firm free-draining substrates. Most
records are from mortar (often on soft or crumbling mortar,
but sometimes growing directly on rather hard mortar), old
concrete, or thin soil on top or in crevices of old or ruined
walls (of cottages, farm houses, mine buildings, old
china-clay dry), also on surfaces of soft basic rock used in
walls or buildings, sometimes on fallen masonry, masonry
debris or isolated blocks of stone. Once on firm soil atop
ridges of china-clay spoil near masonry debris in old quarry.
It usually grows in fully insolated sites or only slightly
shaded, but less often where partly shaded e.g. by herbs or
walls, occasionally persisting as sites become more heavily
shaded by scrub. Grows both inland and near coasts,
occasionally in exposed cliff-top sites receiving much salt
spray. Unusual record of substantial patches on firm soil on
top of sheltered low heaps of china-clay spoil. Often in pure
patches; frequent associates include Aloina aloides, Barbula convoluta, Barbula unguiculata,
Bryoerythrophyllum
recurvirostrum, Bryum radiculosum, Didymodon insulanus,
Didymodon
rigidulus, Didymodon tophaceus,
Encalypta
streptocarpa, Gymnostomum viridulum,
Tortula
muralis.
Rarely c.fr. [five records, but one of these was of
abundant capsules]: capsules immature 3, 4, 6, 7; dehiscing 7;
dehisced [old 4], 7.