*1: Poltesco, 1962, JAP
(BBSUK) (Paton 1969a: 723-724). [Earlier
report (Penzance, in Holmes 1906) not supported by specimen:
Paton 1969a: 723-724].
*2: Pont-by-Fowey,
1905, RWS (TRU) (Paton 1969a:
723-724).
Grows as patches or trailing wefts, or as scattered
stems. Notes on habitats in Cornwall are as follows. Occurs
mainly on rocks (slaty, granitic and serpentinite; on
horizontal to vertical surfaces), locally also on silted bases
of flood-zone trees (Alder, Ash, Sycamore), in and at edges of
larger streams and most rivers. Grows where shallowly
submerged for all or most of year or in lower part of zone of
regular flooding (typically within maximum of 0.2-0.5 m above
summer water-levels of large streams). In middle reaches of
the R. Tamar it is often the commonest bryophyte in a zone
above the lowest summer water levels but well below the limits
of regular autumn and winter flooding (up to 1.5 m above
summer water-level where river floods deeply). A single record
from concrete in flood-zone at edge of a reservoir. Grows in
open or partly shaded, e.g. by deciduous trees. Often in pure
patches. Associates recorded include Didymodon insulanus,
Fontinalis
antipyretica var. antipyretica, Fontinalis squamosa,
Racomitrium
aciculare, Schistidium rivulare,
rarely Dendrocryphaea
lamyana beside Tamar.
Frequently c.fr.: capsules immature 1-5, 10;
dehisced [5 old], 8.