*1: Penzance, 1844, AG
(PNZ) (Paton 1969a:
754-755).
*2: Trehane near
Probus, 1861, ES (TRU) (Paton 1969a:
754-755).
Var. resupinatum is locally
very common in Cornwall and usually distinct from var. cupressiforme in the
straight leaves and erect capsules, but plants are frequently
found which are intermediate in leaf or capsule characters,
suggesting varietal rank might be more appropriate. (e.g.
DTH 06-336 has erect capsules but downcurved
leaves).
Var. resupinatum is often
abundant in vc1, where ubiquitous on the coast, but apparently
much scarcer well inland in vc2 (and mainly in open sites
there, on rock, walls or trees, with H. andoi tending to
replace it inside woodlands). On sea-cliffs in western parts
of vc1 a form grows with all stems more or less erect so as to
form firm cushions 3 or 4 cm deep; it is unclear whether this
is a luxuriant form of humid coastal sites or an ecotype; it
has not been found with capsules. Capsules are much rarer in
exposed sites on sea-cliffs than at sheltered locations
inland. Very slender trailing forms are frequent on bark and
on dry slaty rocks.
Habitat notes from C&S are as follows. Epiphyte
on bark of trunks and branches of Alder, Ash, Grey Willow,
elms, Hazel, oaks including Sessile Oak, Sycamore; also
recorded on Elder, Gorse, Horse Chestnut, Picea abies (dead
twigs), poplar. Tends to occur higher on trunks and more often
on branches than H. andoi where they
occur together. Often persistent for some years on fallen
trunks and branches. Occurs within flood-zone of R. Tamar, but
mainly above zone of regular flooding. Grows unshaded to
moderately or heavily shaded e.g. inside woodlands. On
serpentinite, gabbro, slaty and granitic rock of sea-cliffs,
outcrops, road cuttings, walls, gravestones and in and about
old quarries or mines; locally on soil on slopes or steep
banks (including china clay spoil, occasionally metalliferous
mine spoil) and thin soil over granitic rocks on exposed
slopes above sea-cliffs. On masonry e.g. of bridges and
concrete, e.g. of walls, ruins, graves and old
fence-posts.
Associates commonly include Bryum capillare, Cololejeunea
minutissima,
Cryphaea heteromalla, Frullania dilatata, Hypnum andoi, Isothecium myosuroides
var.
myosuroides,
Metzgeria violacea,
Metzgeria furcata,
Microlejeunea ulicina, Orthotrichum
affine,
Orthotrichum pulchellum, Ulota bruchii, Ulota phyllantha, Zygodon viridissimus
var.
viridissimus, Sedum
anglicum; others recorded include Grimmia lisae, Lejeunea cavifolia, Porella obtusata, Radula
lindenbergiana,
Rhynchostegium confertum, Syntrichia
laevipila, Tortula
viridifolia,
Conocephalum conicum, Zygodon
conoideus.
Commonly c.fr.: capsules immature 1, 2, 7-12;
dehiscing 1-4, 9-12; dehisced
1-12.