*1: Lamorna, 1921, FR
(BM) (Paton 1969a: 705).
*2: Black Head, St
Austell, 1961, JAP (BBSUK) (Paton 1969a:
705). [An earlier report (Landulph, 1931, CPH
(NMW), in Rep. 1937 CHECK ) is
sterile and cannot be determined: Paton 1969a:
705].
Probably somewhat under-recorded since diligent
searching under a dissecting microscope is often needed to
locate the inconspicuous inflorescences needed to establish
its identity. Apparently non-fertile but gemmiferous Radula spp. were often seen on
sheltered serpentinite rocks and on shrubs and trees on the
Lizard pen. (and e.g. on old walls elsewhere inCornwall)
and these may well be mostly of this species (although Radula complanata s. str. occurs on
outcrops).
Habitat notes from Cornwall are as follows. Patches
on serpentinite rock of S.-facing outcrop, partly shaded by
bushes. Slaty rock on S.-facing sea-cliff slope part shaded by
trees. On top of old mortared-stone wall, sheltered and
lightly shaded (Rosteague, male). On bark low on trunk of
Blackthorn bush, in scrub on slope above sea-cliffs. Plentiful
on bark of Sycamore tree well shaded in tall scrub on
S.-facing coastal slope. Recorded associates were Bryoerythrophyllum
recurvirostrum, Bryum capillare, Hypnum cupressiforme
var.
resupinatum, Metzgeria furcata, Zygodon viridissimus
var.
viridissimus.
Usually with gemmae: 1, 4, 9, 10. Antheridia seen:
9; archegonia seen: 9, 10. Perianth present:
4.
