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Pl,celUaph. 4.CENOTHALAME^. lOO.Evernia. 425
C. EvERNiDE^, Thallus nearly crustaceous, branched
apothecia shieldshape, bordered, lateral.
X. 100. EVERNIA. Acharius. Evernia.
Thallus nearly crustaceous, branched, jagged, angular
or compressed, flat; rather upright or pendulous, inside
towlike; apo^Aecia saucershape, sessile, raised up around;
proligerous flake forming the centre, thin, concave, coloured,
inside similar, bent in, with a thalloid border exceeding it.
Evernia prunastri. Plum-tree everjua.
Thallus palish white ; jags two-forked, many-cut, ascending
almost upright, linear, narrow, flat, wrinkled, hollow
underneath very white, slightly grooved ; apothecia reddish
in the centre.
Lichenoides
RaiiSyn.lb,iiO.
arboreum ramosum majus et moUius, colore candicante,
Lichen arborum, Ger. em. 1377, fig. only.
Lichen prunastri, Lin. S. P. 1614 ;
Lichen sticlaceros, Engl. Bot. 1355.
Lichen corniculatiis, Relh. Cantab.
Engl. Bot. 859.
Lobaria prunastri, Hoffm. Germ. 140.
Parmelia prunastri, Achar.Meth. 257.
Evernia prunastri, Achar. Lich. 442.
On the trunks of trees, and wooden palings.
Cephalodia black, sometimes occur in the tips of the jags,
and scattered; soredia white, also found in very old plants.
D. PjSLTiDEiE. Thallus leatherlike, cartilaginous or
leaflike; apothecia shieldlike, bordered.
XL 101. ROCCELLA. Imperati. Rock-moss.
Thallus leatherlike, cartilaginous, branched, jagged, cylindrical
or flat, erect or pendulous, inside towlike; apothecia
saucershape, thick, innate in the thallus; proligerous
Jlake forming the centre, plano-convex, coloured, cartilaginous;
inside transparent, similar, girt with a thalloid
border, at last prominent, sessile, and even with the centre,
covering a black, compact, powdery rather lentilshape
mass hidden within the substance of the thallus.
1 . Roccella tinctoria. Dyeing rock-moss,
Thallus cylindrical, sea-greenish, rather upright, branched
; apothecia scattered, rsised ; centre flat, greyish, hoary,
even with the thalloid border.