*1: Chyenhal, Newlyn,
1860, WC (NMW) (Paton 1969a:
705).
*2: Fowey, 1911, RWS
(TRU) (Paton 1969a:
705).
Habitat notes from C&S are as follows. In
patches, usually small. Commonest as epiphyte on bark of
varied trees and shrubs, including Ash, Elder, Hazel,
Sycamore, Grey Willow; single record on Cotoneaster
integrifolius. Grows unshaded to moderately shaded, e.g.
in groves of deciduous trees; often within flood-zone of
rivers. Associates when growing as epiphyte include Cololejeunea
minutissima, Cryphaea heteromalla,
Frullania dilatata,
Hypnum cupressiforme
var.
resupinatum, Metzgeria violacea, Metzgeria furcata, Metzgeria
consanguinea, Microlejeunea ulicina,
Neckera pumila, Ulota bruchii, Ulota crispa, Zygodon
conoideus.
Other record are of a good patch on decorticated
wood of damp fence, part shaded. Patch on vertical
serpentinite rock in 'hedge' at top of sea-cliff, lightly
shaded by grasses. With mosses on gabbro outcrop. With mosses
or directly on slaty rocks in open on bank, on partly shaded
walls and 'hedge' and on slaty rock in old quarry. On concrete
of bridge over stream (with Zygodon viridissimus).
Spreading onto steep firm soil on steep slaty
bank.
Only recorded c.per. (non-fertile plants recorded
merely as R. complanata s. l., those often
abundantly gemmiferous, as are R. complanata s. str.). Cper: 1-8,
10-12. Commonly c.fr.: capsules immature 1-5, 8, 10-12;
dehiscing 1, 2, 10-12; dehisced 1-5, 8,
10-12.
