*1: Trengwainton near
Penzance, 1844, JR
(PNZ) (Paton 1969a: 751).
*2: Trehane near
Probus, 1861, ES (TRU) (Paton 1969a:
751).
Habitat notes from C&S are as follows. On top
and sides of boulders and other rock (granitic, slaty,
serpentinite) and damp masonry in and at edges of streams,
small and larger rivers, and reservoirs, unshaded or in light
to moderate shade (including woodlands). Common on silted and
unsilted bark on trees and shrubs (Alders, Ash, Grey Willow,
Sycamore, etc.) and on boulders in flood-zones beside
reservoirs and R. Tamar and larger streams. Associates include
Amblystegium serpens
var. serpens, Kindbergia
praelonga, Homalia
trichomanoides,
Hyocomium armoricum, Hypnum cupressiforme
var.
cupressiforme,
Isothecium holtii,
Leskea polyca, Plagiochila
porelloides, Racomitrium aciculare,
rarely Dendrocryphaea
lamyana.
Less often grows away from water, on granitic
boulders on hillsides, sheltered but not much shaded, and on
boulders part shaded by trees on hillslop. On edge of track
away from water. On damp concrete and among masonry in
sheltered part of cemetery and masonry dumped on moist ground
near china clay works. On concrete where water escaping near
china clay settling tank, part shaded. On concrete of ditch
edge near china clay works. Away from water on firm soil of
top of low 'hedge' beside track in deciduous woodland (with Diphyscium foliosum),
on part-shaded hedge at edge of deciduous grove, and on low
rocks or boulders e.g. in shady deciduous woodland edge.
Unusual records of pure patch several metres long on concrete
beneath edge of wall of old galvanised-iron sheeting, and of
plenty on cast-iron of old pipe above river bank, lightly
shaded by trees.
Commonly c.fr.: capsules immature 1-4, 8, 10-12;
dehiscing 1-3; dehisced 1-8.