*1: Bochym, Mullion,
1935, WEN (CGE) (Paton 1969a:
706).
*2: Rocks and stone
walls, near the sea, Polperro, 1935, FR det. WEN
(CGE) (Castell 1950: 379, Paton 1969a:
706).
Commonly in patches or mats, often pure, but also
intermixed with low-growing pleurocarpous mosses, or other
liverworts, or epiphytic on them. Growing on rocks (gabbro,
granite, serpentinite, slates), damp masonry (stone walls;
concrete; mortared stonework of bridge) and on firm soil on
banks, or bases of trees or Grey Willows (extending higher on
trunks in humid sheltered places), usually in shaded places
(often heavily shaded in woodland or Grey Willow
carr) or at least where sheltered. Occurs on stream-sides
(often within flood zones of rivers, streams or reservoirs,
even quite close to water-level), sometimes on boulders in
streams, 'hedges' and banks beside lanes, a disused railway
cutting, old stone walls, rock outcrops or boulders in
woodland, old quarries or rocks trickling with water, inside
entrance to mine adit high on sea-cliff. Unshaded on
serpentinite and granitic rocks of N.-facing slopes above low
sea-cliffs, with mosses. Unusual record of patches on
cast-iron of old pipe under trees near river
bank.
Common associates include Kindbergia praelonga,
Oxyrrhynchium
pumilum, Hypnum
cupressiforme var.
resupinatum, Isothecium myosuroides
var.
myosuroides, Lophocolea
heterophylla, Metzgeria furcata, Pseudotaxiphyllum
elegans, Rhynchostegium
confertum, Thamnobryum
alopecurum, Trichostomum
brachydontium. Others recorded include Chiloscyphus
polyanthos, Heterocladium heteropterum
var. flaccidum,
Heterocladium
heteropterum var. heteropterum, Homalia
trichomanoides, Lophocolea fragrans,
Plagiochila
porelloides, Radula
complanata.
Commonly cper: 1-5, 7, 10-12. Rarely c.fr.:
immature 3, 11; dehisced 1.