THE LICHEN FLORA OF THE BASILDON AREA 145
C. decipiens (Arnold) Jatta
Frequent on asbestos-cement, limestone, concrete and mortar. 51/68,
69, 78, 79.
Limestone gravestones and walls of All Saints' Church, Hutton (1972,
PME-B); concrete wall, Great Cowbridge Grange (1972, IMH); red
asbestos-cement roofing tiles, North Benfleet (1972, SJH); mortar of brick
wall, Jubilee Cottages, Norsey Road, Billericay (1973, PME-B); corrugated
asbestos-cement roof, Botney Hill Farm, Little Burstead (1974, PME-B);
limestone gravestones in churchyard, St Mary's Runwell (1974, PME-B);
corrugated asbestos-cement roofs, disused barracks, Langdon Hills (1974,
PME-B).
C. heppiana (Mull. Arg.) Zahlbr.
Locally frequent on limestone and concrete. 51/69, 79.
Limestone gravestones and wall of All Saints' Church, Hutton (1972,
PME-B); top of concrete wall, Perry Street, Billericay (1972, SJH); lime-
stone gravestones and wall of St Mary's, Runwell (1974, PME-B).
This species, together with Caloplaca citrina, C. decipiens, C. saxicola,
Candelariella medians, Lecanora dispersa, Physcia spp., etc. form the union
Caloplacetum heppianae, especially on the horizontal tops of the limestone
headstones in churchyards.
C. holocarpa (Hoffm.) Wade
Common on asbestos-cement, concrete and mortar. 51/68, 69, 78.
Although found on man-made substrates throughout the area, I have
not found this species on limestone.
C. saxicola (Hoffm.) Nordin
Scarce on limestone and concrete. 51/69, 79
Limestone gravestones in the churchyards of All Saints', Hutton (1972,
PME-B) and of St Mary's, Runwell (1974, PME-B).
Candelariella aurella (Hoffm.) Zahlbr.
Common on concrete and asbestos-cement; rare on limestone, 51/68, 69,
78, 79.
This species, together with Lecanora dispersa, are frequently the first
colonisers of man-made calcareous substrates, and often the only ones in
the centres of the urbanised areas.
C. medians (Nyl.) A.L. Sm.
Occasional on limestone. 51/69, 79.
Tops of limestone headstones in churchyard of All Saints', Rettendon
(1971, IMH); horizontal tops of headstones in churchyard of All Saints',
Hutton (1972, PME-B); sides and tops of limestone headstones and on
sloping surface of wall of St Mary's, Runwell (1974, PME-B).
C. reflexa (Nyl.) Lett.
Very rare on Salix. 51/68.