*1: Perranporth, 1925,
FR (BM) (Paton 1969a:
724-725).
*2: Looe, 1926, FR
(BM) (Paton 1969a:
724-725).
Usually grows in small patches or cushions, forming
low lawns where plentiful, or growing intermixed with other
low mosses where sparse. Notes on habitats in C&S are as
follows. Commonest on hard surfaces of calcareous masonry,
especially mortar and concrete (also on basic stone surfaces
and asbestos cement). It occurs on walls, old buildings,
ruins, bridges, grave-stones and grave surrounds, path
surfaces and even concrete fence-posts and small bits of
concrete on soil heaps. Usually in free-draining places that
dry out regularly and for long periods, mainly avoiding
permanently wet or heavily flushed situations. Most often in
open, sometimes in moderate shade, occasionally in rather
heavy shade from trees or walls (T.L. Blockeel in Hill et al. 1992: 274 noted
that 'it is not tolerant of intense insolation and is usually
found where there is some shelter or shade', but in Cornwall
it often occurs in exposed sites that are fully insolated).
Unusual records: on granitic boulder; on granite gatepost;
thin soil in crevices of tarmac of path in cemetery (Illogan);
plentiful on moist old carpet dumped on mine-spoil
(Tuckingmill); patch on hard wood of horizontal, decorticated
tree trunk lying in open. Associates commonly include Bryum radiculosum, Grimmia pulvinata, Schistidium apocarpum,
Schistidium
crassipilum, Tortula muralis, Zygodon viridissimus
var. viridissimus,
less often Didymodon
luridus, Orthotrichum anomalum,
Orthotrichum
diaphanum.
Commonly with foliar gemmae. Rather frequently
c.fr. (although capsules sometimes occur in small quantity or
are eaten off before maturity): capsules immature 1, 2, 6, 7,
[8], 10-12; dehiscing 2, 3; dehisced 2, 3, 5, 6, [9], 10,
11.