*1: Rosemodress Cliff,
Lamorna, JR & WC (Ralfs & Curnow MS. 1881); near
Mawgan, 1958, TL (Paton 1969a: 747).
*2: Tregawn near
Withiel, 1874, RVT (CMM) (Paton 1969a:
747).
Habitat notes from Cornwall are as follows. On
stones and rocks (including slates), firm soil, exposed tree
roots or dead wood in shallow flowing water of ditches,
streams and rivers, often where only inundated for part of
each year, almost
unshaded or shaded by trees. In similar habitats in inundation
zones around reservoirs. Apparently tolerates eutrophication:
found twice in streams not far below outlets from sewage works
(with Platyhypnidium
riparioides as associate once). On concrete close to water
level of pool, slightly shaded. On masonry near ditch. Patch
on flat concrete above ground near a ruin. On gabbro rocks at
water level in pond (of clean water) under open cover of
Sycamore trees. Thin soil over roots in Grey Willow carr, shaded. Base of
trunks of Grey Willows beside pool in old quarry and at edge
of pond in dunes; bit also on old metal of rusted oil drum
near water-level. In small quantity on partly bare patch of
damp soil in pasture, near woodland edge but almost unshaded.
On rotting wood on wet ground under trees near stream and in a
wet Grey Willow carr. On stony soil
and old concrete of wet, partly shaded lanes. Scrap in crevice
of tarmac of part-shaded lane. On damp sand at base of open,
unshaded fen vegetation near small stream at edge of dune
grassland. Small amount in arable field (new grass-ley), with
Bryum dichotomum,
Dicranella
staphylina, Trichodon cylindricus,
Epipterygium
tozeri, Fossombronia
caespitiformis, Tortula truncata.
Small amounts on soil in stubble field (just) within zone
occasionally inundated by R. Tamar. Plentiful on rather dry
loam soil in arable field (brassicas), with Kindbergia praelonga,
Oxyrrhynchium
hians, Brachythecium
rutabulum.
Often grows in pure patches, but sometimes
associated with or close to Hygroamblystegium
fluviatile, Amblystegium serpens
var. serpens, Chiloscyphus
polyanthos, Ephemerum serratum, Fontinalis
antipyretica var. antipyretica, Fontinalis squamosa,
Hygrohypnum ochraceum, Platyhypnidium
riparioides,
Scapania undulata.
Frequently/commonly c.fr.: capsules immature 1,
3-7, 9-11; dehiscing 4-6, 8-10; dehisced 1,
9-11.