The Lichens and Lichenicolous Fungi of Belgium and Luxembourg ...

144 P. DIEDERICH & E. SÉRUSIAUX
PLACOPSIS (Nyl.) Linds.
lambii Hertel & V. Wirth
Syn.: P. gelida auct. belg., non (L.) Linds.,
Lecanora gelida auct. belg., non (L.) Ach.
On slate debris, especially those rich in heavy
metals, in disused quarries.
B Ard.: RR (but common in its localities). L - . F
Ard.: RRR.
Lit.: L5: 37, NL77: 22.
gelida (L.) Linds., syn. Placodium gelidum (L.) Körb.
Reported from L Ard. by Ko: 190-191, but no specimen
has been seen.
gelida auct. belg., non (L.) Linds., see P. lambii
PLACOPYRENIUM Breuss
Catapyrenium subtrachyticum B. de Lesd.
On calcareous stones of a wall.
B - . L - . F Mar.: RRR (1902) (type locality).
According to Breuss (1990: 144), this taxon
belongs to Placopyrenium, but its taxonomic
status requires further studies.
Lit.: BDL1: 232, Breuss (1990: 144).
trachyticum (Hazsl.) Breuss
Syn.: Dermatocarpon trachyticum (Hazsl.) Vain.
On a tufa rock, on a calcareous gravestone and on a
sandstone wall in an old castle.
B Fl.: RRR. L Lorr.: RR. Overlooked ?
Lit.: L8, Mü4: 109.
PLACYNTHIELLA Elenkin
Syn.: Saccomorpha Elenkin
dasaea (Stirt.) Tønsberg
Corticolous, on acid bark, usually at the base of
trees, lignicolous or terricolous, on soil, plant
detritus, etc.
B - , overlooked. L Ard.: R, Lorr.: AR.
Lit.: L8.
icmalea (Ach.) Coppins & P. James
Syn.: Saccomorpha icmalea (Ach.) Clauzade & Cl.
Roux
On various acidic substrates, incl. bark, wood (incl.
burned or rotting), plant debris, humus-rich soil
or sand, sometimes very abundant, either in
exposed or shaded habitats; rare on shaded, siliceous
rocks.
B Mar.: RRR, Camp.: AC, Mosan: RR, Ard., Lorr.:
AC. L Ard.: AC, Lorr.: AC.
Lit.: Di: 206, NL93: 45-46, NL97: 54, Coppins & van
den Boom (1995: 89).
oligotropha (J. R. Laundon) Coppins & P. James
Syn.: Lecidea oligotropha J. R. Laundon, Saccomorpha
oligotropha (J. R. Laundon) Clauzade &
Cl. Roux
Terricolous, on humus-rich soil or on old rotting
stumps.
B Camp.: AR, Ard.: AR. L Ard.: RRR, Lorr.: RRR
(†1891). F Mosan: RRR, Ard.: RRR.
Lit.: La69: 84, 102, NL87: 23, Sé: 139.
uliginosa (Schrad.) Coppins & P. James
Syn.: Lecidea uliginosa (Schrad.) Ach., Saccomorpha
uliginosa (Schrad.) Hafellner
Terricolous, on detritus and humus-rich soil, or on
dead or rotting bark.
B Camp.: R, Ard.: AR, Lorr.: RRR. L Ard.: RRR,
Lorr.: R.
Lit.: Di: 206, La69: 84, 102, Mü1: 143, Sé: 139.
PLACYNTHIUM (Ach.) Gray
hungaricum Gyeln.
On exposed, hard calcareous rocks, often along cracks
remaining moistened during longer periods.
B Mosan: R. L - .
Lit.: Ertz: 20, L8.
nigrum (Huds.) Gray
Syn.: Lecothecium corallinoides (Hoffm.) Körb.
On hard calcareous substrates (natural rocks, walls,
concrete, etc.) submitted to periodic flushing.
B Fl.: RR, Brab.: RRR, Mosan: AC, Ard.: RR,
Lorr.: AR. L Ard.: RRR, Lorr.: AR.
Lit.: Ertz: 20, Mü2: 197, NL84: 16, NL92: 173, NL97: 54.
subradiatum (Nyl.) Arnold
On vertical faces of exposed, hard calcareous rocks,
mainly on surfaces submitted to periodic flushing.
B Mosan: RR. L - . F Mosan: RRR.
Lit.: Ertz: 20, L8, NL84: 16.
tremniacum (A. Massal.) Jatta
On hard calcareous rocks, mainly on surfaces submitted
to periodic flushing.
B Mosan: RR. L - .
Lit.: Ertz: 20, L8.
garovaglii (A. Massal.) Malme, syn. P. nigrum var. caesium
auct. Reported from B by DG: 21, but no material seen.
nigrum var. caesium auct., see P. garovaglii