Pi, cell, aph. 4. CENOTHALAMEAE. 100, Evernia. 425 
C. Evernipez, 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 ; apothecia 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 evernia. 
Thallus palish white; jags two-forked, many-cut, ascend- 
ing almost upright, linear, narrow, flat, wrinkled, hollow; 
underneath very white, slightly grooved; apothecia reddish 
in the centre. 
Lichenoides arboreum ramosum majus et mollius, colore candicante, 
Rait Syn, TH, 80. 
Lichen arborum, Ger. em. 1377, fig. only. 
Lichen prunastri, Lin. S. P. 1614; Engl. Bot. 859. 
Lichen stictaceros, Engl. Bot. 1355, 
Lichen cerniculatus, Relh. Cantad. 
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. Pe.tivem. Thallus \eatherlike, cartilaginous or 
leaflike; apothecia shieldlike, bordered. 
XI. 101. ROCCELLA. Imperati. Rock-moss. 
Thallus leatherlike, cartilaginous, branched, jagged, cy- 
lindrical or flat, erect or pendulous, inside towlike; apo- 
thecia saucershape, thick, innate in the thallus; proligerous 
flake forming the centre, plano-convex, coloured, cartila- 
ginous; 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 tinctorza. Dyeing rock-moss. 
Thallus cylindrical, sea-greenish, rather upright, branch- 
ed; apothecia scattered, raised; centre flat, greyish, hoary, 
even with the thalloid border. 
