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

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THE LICHENS OF BELGIUM AND LUXEMBOURG. AN ANNOTATED CHECKLIST 143<br />

muscigena (Ach.) Poelt, syn. Physcia muscigena (Ach.) Nyl.<br />

Reported from B by DG: 40, but no material seen <strong>and</strong><br />

hence doubtful.<br />

pulveracea Moberg, see P. distorta<br />

pulverulenta (H<strong>of</strong>fm.) Poelt, see P. distorta<br />

venusta (Ach.) Poelt, syn. Physcia venusta (Ach.) Nyl. <strong>The</strong><br />

material from B referred to this southern European species<br />

by DG: 40 most probably belongs to P. perisidiosa.<br />

PHYSMA A. Massal.<br />

compactum (Wallr.) A. Massal., see Lempholemma polyanthes<br />

PHYTOCONIS Bory, see Omphalina<br />

PLACIDIOPSIS Beltr.<br />

cartilaginea (Nyl.) Vain.<br />

Syn.: P. custnani (A. Massal.) Körb.<br />

On soil in Xerobromion communities over calcareous<br />

rocks.<br />

B Mosan: RR, perhaps overlooked. L - .<br />

Lit.: L8, La69: 99, Breuss (1996: 77).<br />

cinerascens (Nyl.) Breuss<br />

On soil in Xerobromion communities over calcareous<br />

rocks.<br />

B Mosan: RRR (1905), perhaps overlooked. L - .<br />

Lit.: Breuss (1996: 81).<br />

custnani (A. Massal.) Körb., see P. cartilaginea<br />

PLACIDIUM A. Massal.<br />

pilosellum (Breuss) Breuss<br />

Syn.: Catapyrenium pilosellum Breuss, Dermatocarpon<br />

rufescens auct. p. p., non (Ach.) Th. Fr., D. trapeziforme<br />

auct. p. p., non (J. König) Trevis.<br />

On calcareous soil, mainly in Xerobromion communities,<br />

sometimes on artificial substrates like<br />

wall crevices.<br />

B Mosan: AR in suitable localities, especially in the<br />

main valleys. L Lorr.: RR. F Mosan: AR in suitable<br />

localities in the Meuse valley.<br />

By far the most common species <strong>of</strong> the genus in the<br />

Mosan district.<br />

Lit.: Ertz: 36, NL84: 13, Breuss (1990: 98-103).<br />

rufescens (Ach.) A. Massal.<br />

Syn.: Catapyrenium rufescens (Ach.) Breuss, Dermatocarpon<br />

rufescens (Ach.) Th. Fr.<br />

In crevices <strong>of</strong> old calcareous walls.<br />

B Mosan: RR, most probably overlooked. L - .<br />

Lit.: Breuss (1990: 104-111).<br />

squamulosum (Ach.) Breuss<br />

Syn.: Catapyrenium squamulosum (Ach.) Breuss,<br />

Dermatocarpon rufescens auct. p. p., non (Ach.)<br />

Th. Fr., D. trapeziforme auct. p. p., non (J.<br />

König) Trevis.<br />

On calcareous soil, mainly in Mesobromion <strong>and</strong><br />

Xerobromion communities.<br />

B Mosan: R, probably overlooked. L Lorr.: R. F<br />

Lorr.: RRR.<br />

Lit.: Breuss (1990: 114-125).<br />

lachneum (Ach.) B. de Lesd., syn. Catapyrenium lachneum<br />

(Ach.) R. Sant. <strong>The</strong> specimens from L Lorr. published<br />

under this name by Diederich (1986a: 118) refer to<br />

Placidium pilosellum <strong>and</strong> P. squamulosum.<br />

PLACOCARPUS Trevis.<br />

(*)schaereri (Fr.) Breuss<br />

Syn.: Dermatocarpon monstrosum (Schaer.) Vain.<br />

On natural, hard calcareous rocks in dry <strong>and</strong> sunny<br />

conditions, initially parasitic on Lecanora (probably<br />

L. muralis), soon forming an independent<br />

thallus.<br />

B Mosan (Molignée valley): RRR (1988). L - .<br />

Lit.: L6: 145, La66: 192-195.<br />

PLACODIUM F. H. Wigg.<br />

albescens (H<strong>of</strong>fm.) A. Massal., see Lecanora albescens<br />

circinatum (Pers.) Gray, see Lobothallia radiosa<br />

crassum (Huds.) Th. Fr., see Squamarina cartilaginea<br />

fulgens (Sw.) Gray, see Fulgensia fulgens<br />

gelidum (L.) Körb., see Placopsis gelida<br />

gypsaceum (Sm.) A. Massal., see Squamarina gypsacea<br />

lentigerum (Weber) Th. Fr., see Squamarina lentigera<br />

saxicolum (Pollich) Frege, see Lecanora muralis<br />

PLACOLECIS Trevis.<br />

Syn.: Astroplaca Bagl.<br />

opaca (Fr.) Hafellner<br />

Syn.: Astroplaca opaca (Fr.) Bagl., Lecidea entochrysoides<br />

Hue<br />

On natural, dry <strong>and</strong> sunny, calcareous rocks.<br />

B Mosan: R (type locality <strong>of</strong> L. entochrysoides). L - .<br />

Lit.: Ertz: 20, 27, L8, Schneider (1979: 64-67).

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