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be restricted to Lecanora dispersa agg., whereas the very similar Arthonia le-
canorina (ALMQ.) R. SANT. is growing on Lecanora albella (SANTESSON et al. 2004).
Collections of Arthonia clemens (THUL.) TH. FR. (which is resticted to the genus
Rhizoplaca, see GRUBE & MATZER 1997) on Lecanora dispersa agg. are reported
from several locations in Italy (according to NIMIS 1993) and also from Sicily
(VAN DEN BOOM 1992). They may belong to Arthonia galactinaria or even to
Arthonia apotheciorum (MASSAL.) ALMQ., growing on Lecanora albescens.

Arthonia intexta ALMQ.
3: on Lecidella carpathica (hb IVL 3977).

This cosmopolitan species was reported in Italy from Friúli-Venezia
Giulia (HERTEL 1969), Trentino-Alto Adige (KEISSLER 1930, POELT 1957, HERTEL
1969) and Sardinia (NIMIS & POELT 1987), but not from Sicily. Arthonia intexta is
growing inside the apothecia of saxicolous species of Lecidella.

Arthonia molendoi (HEUFL. ex FRAUENFELD) R. SANT.
10b: on the thallus and apothecia of Xanthoria parietina (hb IVL 3938).

Arthonia molendoi is widely distributed in Europe and North America, and
there are also reports from Asia, Oceania and the Antarctic. This seems to be the
first report for Sicily.

Arthonia varians (DAVIES) NYL.
3: on Lecanora rupicola (hb IVL 3974).

Arthonia varians is known from several European countries as well as from
North America and from Turkey. According to NIMIS (1993) the species is
widely distributed in Italy and it is known also from Sicily (GRILLO & CANIGLIA
1989). The species is growing in the apothecia of the Lecanora rupicola group.

Carbonea supersparsa (NYL.) HERTEL
20: on Lecanora polytropa (hb IVL 3952).

The species is widely distributed in Europe and also known from North
America and the Canary Islands. In Italy it is known from Trentino-Alto Adige,
Toscana, Lazio and Sardinia (NIMIS 1993), as well as from Sicily (GRILLO &
CANIGLIA 1989).

Cercidospora epipolytropa (MUDD.) ARNOLD
20: on Lecanora polytropa (hb IVL 3954).

Cercidospora epipolytropa is widely distributed in the northern hemisphere,
in Italy it is known from Toscana (HAFELLNER 1987). New for Sicily.

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