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*1: Trefusis Grove, Falmouth, 1847, EAW (TRU) (Paton 1969a:
693).
*2: Penventinue, Fowey, 1905, RWS (TRU) (Paton 1969a:
693).
Grows as almost flat patches, often extensive, or
mixed with other bryophytes. Habitat notes from C&S are as
follows. Often common as epiphyte on bark of trunks and
branches of Alder, Ash, Beech, Elder, elms, Grey Willow,
Hazel, hybrid poplars, Rhododendron, Sessile Oak, Sycamore;
single records from Chamaecyparis
lawsoniana, stem of cultivated Cherry, Cortaderia, Cupressus macrocarpa,
Gorse, Ivy, Prunus
laurocerasus, Sitka Spruce, Sweet Chestnut, Wild Cherry,
Wild Privet. Associates include Cololejeunea
minutissima, Frullania dilatata, Hypnum andoi, Hypnum cupressiforme
var.
resupinatum, Lejeunea lamacerina,
Metzgeria violacea,
Microlejeunea
ulicina, Ulota
phyllantha, Ulota
bruchii, Ulota
crispa. In unshaded, part shaded and rather heavily shaded
sites, on isolated trees, in groves or in woodland or scrub,
sometimes on slopes above sea-cliffs. Extends down into
flood-zone beside R. Tamar (with Leskea polycarpa, Orthotrichum
sprucei).
Often plentiful on rock, as pure patches or
intermixed with other bryophytes, on serpentinite, granite and
slate rocks of crags, old quarries, walls and in 'hedges', in
open (including exposed sites above sea-cliffs) and lightly to
moderately shaded, on vertical, overhung or sloping surfaces.
On steep or vertical granitic rocks of 'hedges' (partly
amongst mosses), similarly on walls around old mill race,
lightly shaded. Shaded rock of wall. Granitic boulders beside
streams, often but not always shaded, extending down into
flood-zone. Associates on rock or masonry include Lejeunea lamacerina,
Rhynchostegium
confertum. On firm soil at top of low bank of mine-spoil
in dune grassland (on lip of steep part of bank, in small
opening amongst low grasses). Patch on steep, firm soil on
'hedges', soil near gravestone in churchyard. On slopes above
exposed sea-cliffs, growing over steep firm soil or on or with
mosses, often forming an intermixed mat. On serpentinite,
gabbro and granitic rocks and their edges and in crevices high
on sea-cliffs, sometimes in exposed sites (once with Frullania microphylla
var.
microphylla). On cast-iron of old pipe under trees near
river.
Occasionally with gemmae. Plants with narrow
gemmiferous branches (formerly separated as 'var. ulvula') are frequent
on the Isles of Scilly, but connected to the typical form by
intermediates.
Frequently c.fr.: immature 1-4, 10-12; dehiscing
10, dehisced 4, 10-12.
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