*1: [Record from St
Mary's, 1908, GBS (BM) accepted by Paton
(1969a: 751) but rejected here as likely to represent
misidentified S. touretii, as discussed below]. Another voucher specimen
from vc1 is therefore needed!
*2: Cargreen, 1933, CPH
(BM) (Paton 1969a:
751).
See notes under S. touretii regarding
plants resembling this species from Isles of
Scilly.
Habitat notes from C&S are as follows. Most
sites are close above water-level of streams and rivers,
within usual flood-zone, or where flooded in at least some
years, hence extending 2 (-3) m above water of R. Tamar but
only ca 1 m above
stream at Poltesco. Grows on silted bases of trees (Alder,
Ash, Grey Willow, Sycamore recorded), boulders and partly
silted rocks (including serpentinite), mostly where partly
shaded by deciduous trees. Although very local, sometimes
occurs in considerable amounts, forming large pure patches.
Associated species in these habitats include Sciuro-hypnum
plumosum, Homalia
trichomanoides, Leskea polycarpa and
Thamnobryum
alopecurum.
Also recorded in several man-made sites that
combine hard substrates with periodic inundation and usually
some shading by deciduous trees: near Roseworthy a bit on
concrete lining of roadside ditch near stream, where almost
unshaded; at Trengwainton on inclined concrete of gutter at
edge of roadway, part shaded by deciduous trees. At Hessenford
on old tarmac of sloping footpath (with Didymodon nicholsonii
and other mosses); E. of Roche in sparse mats on damp old
tarmac of lane (with much Didymodon
nicholsonii). At Kenwyn Churchard (Truro), locally
plentiful on old tarmac of little-used path, moderately shaded
by trees; also on low rocks and concrete (vertical and
horizontal) of grave surrounds and path edges nearby, and in
small amounts on hard soil of sparsely vegetated banks (all in
partly to fairly heavily shaded places). In Mawnan churchyard
on granitic chippings of grave covering, slightly shaded by
trees. At Titson on pavement with other mosses, shaded by N.
wall of graveyard (with Bryum dichotomum, Didymodon
insulanus).
Not seen c.fr.
