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M8 Ul.Placod. 4. CENOTHALAMEiE. Pl.cell.apk.
6. Placodiiim circinatum. Compass placodium.
Crust cracked in beds, greyish white ; circumfei'ence
rayed, plaited, linear, jagged ; apothacia very crowded, at
length angular; centre with innate beds, flat, brown-black;
tlialloid edge nearly even.
Lichen radiosiis, Hoffni. Lich. 4, 6.
Lichen circinatus, Persoon in Uster Ann. 7, 25; Engl. Bot. 1941.
Lichen siibimbriciitiis, Relhan Cant. 459.
Lob.'.ria radiosa, Hoffm. Germ. 157.
Paruielia circinata, Jchar, MetJi. 189.
Lecanora circinaia, Achar. Lich. 425.
On limestone.
7. Placodium gelidum. Cold placodium.
Crust cracked, flesh- grey; circumference rayed, jagged;
central wart brown, radiately wrinkled; apolhecia depressed
thalloid border thick, raised, not cut.
in the centre, red ;
Liciicn 2;elidiis, Lin. Mnnt. 133 ;
Lichen IL-clse, Fl. Dan. 470.
Engl. Bot. 699.
Paimelia gelida, Achar. Meth. 188.
Lecanora gelida, Achar. Lich. 4'i8.
On rocks.
Thalloid wart in the centre very singular, it probably
should form a separate genus.
8. Placodium dispersum. Dispersed placodium^
Crust dispersed, granulated, unequal, nearly grey, sometimes
very small; o/^oZ/ieda scattered ; centre flattish, pale
brown-grey, and black; thalloid harder raised, thin, crenulated.
Lichen creniilatus, Dicks. Crypt. 5, 9 ; Engl. Bot. 930.
Lichen dispersus, Fersoonin U1st. Ann. 7, 27.
Parmelia dispersa, Achar. Meth. 169.
Lecanora galactina dispersa, Achar. Lich. 424.
On v/alls, stones, and limestone rocks.
XXII. 112. RINODINA. Acharius. Rinodine.
Thallus crustaceous, flat, expanded, adnate, uniform
apothecia saucershape, thick, adnate, sessile ; proligerous
flake forming the centre, plano-convex, coloured, covering
the apothecium above; inside cellular, streaked; thalloid
border rather thick, colour of the thallus, nearly free.