*1: W. of
Carbis
Bay
hotel, 1916, WEN (CGE) (Paton 1969a:
702).
*2: Thin soil on
masonry retaining mine spoil, N. of Crow's Nest, NE. of
Liskeard, SX26, 1997, DTH 97-448 det. & comm. JAP
(DTH) (Long 1999: 93).
Habitats recorded in Cornwall are as follows.
Leswidden: several small patches found over the years on thin
unshaded or lightly shaded soil overlying old concrete walls
of disused china-clay 'drys'; associates included Cladonia sp., Dicranella varia, Weissia cf. controversa. Crenver
Grove: patches on friable soil in crevices of old, partly
shaded, mortared stone wall. Crow's Nest: on crumbling loamy,
vertical soil under overhang at junction of two stone walls
retaining slopes of mine-spoil; partly shaded; no immediate
associates, but Cephaloziella massalongi
and Dicranella
varia growing close by. Gear Sands: sparse stems, on
partly bare patches in short calcareous grassland on landward
edge of dunes, with Distichium inclinatum,
Fissidens sp., Southbya tophacea,
close to Tortella
flavovirens.
Always? with gemmae. Perianths common (antheridia
and archegonia but no perianths in 11, female bract ring
growing but no perianths 3); c.fr.: immature/dehiscing 10.
Chemical analyses of its substrate at
a mine site in East Cornwall
show it tolerates high levels of Cu accompanied by at least
moderately high levels of both Pb and Zn. The substrate
investigated was circumneutral. At other sites, e.g.
Leswidden, it is unlikely that there are high levels of any
heavy metal.
Analyses of substrates from
locality in Cornwall (metal
concentrations given as µg/g dry
weight):
LOCALITY (N samples) Cu
Pb
Zn
pH
Source
Crow's Nest, vc2 (1)
2934
587
177
7.0
Walsh (2001)
