*1: Near Penzance,
1844, JR (PNZ) (Paton 1969a:
750).
*2: Withiel, 1888, RVT
(B) (Paton 1969a: 750).
Forming patches, sometimes extending over several
square metres. Habitat notes from C&S are as follows.
Unshaded or partly shaded (occasionally persisting as sites
become heavily shaded), horizontal, sloping or vertical
concrete and masonry of calcareous or mortared walls (stone or
brick), slates of a roof. Serpentinite rock part shaded in
woodland or by scrub. Slaty or serpentinite rocks in open on
slopes above sea-cliffs, on exposed headlands and on unshaded
rocky bank near coast. Vertical granite of S.-facing rock wall
in old quarry. Slate rock in quarries. Vertical granite of
mortared masonry of ruins, old viaduct and old mill-leat,
vertical granite of part-shaded 'hedge' and on granite
boulders (presumably where basic). On gravestones and grave
surrounds. Firm soil of steep almost unshaded banks. Epiphyte
on Ash, Beech, Hazel, Sycamore trunks, twice on Grey Willow
(exceptionally, at Heligan, epiphyte on Ginkgo biloba trunk),
noted twice on Elder, once on oak stump. Also on decorticated
wood of fallen trunks in open.
Associates on rock and walls include Brachythecium
rutabulum, Bryum
capillare, Grimmia
trichophylla s.
l., Neckera
complanata,
Schistidium crassipilum, Tortula muralis, Zygodon viridissimus
var.
viridissimus, rarely Porella obtusata. On
bark with or near Cryphaea
heteromalla, Hypnum
cupressiforme var.
resupinatum,
Metzgeria violacea,
Orthotrichum affine, Radula
complanata.
Frequently c.fr.: capsules immature 1, 2, 7-12;
dehiscing 1, 10, 12; dehisced 1-5, [6, 7 old] 9, 10,
12.
