*1: Trevelloe Wood,
Lamorna, 1882, WC (NMW) (Paton 1969a:
700-701).
*2: Amy Down, S. of
Callington, 1961, JAP (BBSUK) (Paton 1969a:
700-701). [Paton 1969a: 700-701 notes that record in CC 1913 attributed to
RWS, but specimen (St Breward, 1907, RWS
(TRU)) is Solenostoma
gracillimum].
Some of the post-1992 records of non-fertile plants
are placed only as 'C. polyanthos s. l.' (plants c.per.
were usually assigned to the segregate spp., although the
perianth mouth was sometimes so eroded or decayed that
determination was not possible; non-fertile plants growing
submerged in streams were always placed as 45.1 s.
str.).
Usually grows in pure mats or patches. Habitat
notes from Cornwall are as follows. On granitic or slaty rocks
or soil close to or beneath water level (ranging from
shallowly submerged at depths down to 15 cm up to 10 cm above
water, occasionally higher) in flushes, trickles, streams and
rivers, unshaded to well shaded by deciduous trees of groves
or woodlands or Grey Willows in carr; associates include Hygroamblystegium
fluviatile, Fissidens pusillus, Fontinalis antipyretica
var.
antipyretica, Fontinalis squamosa,
Hygrohypnum
ochraceum, Leptodictyum riparium,
Platyhypnidium
riparioides, Scapania undulata,
lichens, rarely Lophocolea bidentata,
Porella pinnata. On
granitic rock in mill race at water level and on flushed
granite of side-wall where receiving spray from waterfall;
lightly shaded. On damp soil in flush above river bank in
deciduous woodland. Among mosses (Calliergonella
cuspidata) and Grey Willow-litter in shallow water beneath
carr of Grey Willow. Among mosses at water-level of unshaded
edge of large oligotrophic pool (old china clay pit).
Apparently tolerates considerable eutrophication of stream
water, persisting after Fontinalis squamosa
and Scapania
undulata disappear, often with no aquatic bryophytes
associates other than Platyhypnidium
riparioides.
Frequently/commonly c.fr.: capsules immature 1, 2,
4, 10, 12, dehiscing 4.
