*1: Trengwainton near
Penzance, 1844, AG
(PNZ) (Paton 1969a: 748).
*2: Halgavor Moor near
Bodmin, 1888, RVT (B) (Paton 1969a:
Forms rather flaccid trailing patches, wefts, or
low mats or carpets. Habitat notes from Cornwall are as
follows. Mainly grows on rocks (granitic, slaty, or masonry)
shallowly submerged or close above water-level, in soft-water
streams (often quick-flowing) or rivers; also in inundation
zones beside reservoirs. Grows in open and where partly to
well shaded. Occasional records were from firm soil, mud on
Grey Willow roots, moist concrete (beside a stream and in
roadside drains) and once on an exposed tree root. In ditches
and streams near china clay works it sometimes persists where
the water is 'milky' with suspended fine sediment. Also
recorded in a stream very close to the sea-shore near St Just
in Penwith, where it must be exposed to heavy salt-spray
during winter storms. Mainly grows within a few cm of water
level (maximum noted was ca 0.5 m), but an unusual record was low
on unshaded, sheltered, granitic boulders a few metres away
from a stream.
Usually found as pure patches; associates include
antipyretica var. antipyretica, Fontinalis squamosa,
riparioides, Scapania undulata,
aciculare and Sciuro-hypnum plumosum
are usually at slightly higher levels.
Not seen c.fr.