Pi. cell. aph. 4. CENOTHALAMEZ. 106..Cetraria. 433 
4, Cetraria glauca. Sea-green cetraria. 
Thallus sea-green, rather shining, underneath brownish 
black, sinuately lobed; jags deeply cut, torn, complicated, 
ascending; apothecta elevated, bright bay; thalloid border 
wrinkled. sie 
Lichenovides endiviz foliis crispis splendentibus, subtus nigricantibus, 
Dillen Muse. 192. 
Lichen glaucus, Lin. S. P. 1615. 
Lobaria glauca, Hoffm. Germ, 149. 
Cetraria glauca, Achar. Meth, 296; Lich, 509. 
On the trunks of trees, and rocks. 
B. fallax. Thallus white on both: sides, underneath: fre- 
quently spotted with black. 
Lichen-glaucus, Wulf..in Jacq, Coll. 4; 
Lichen fallax, Weber Fl. Germ. 244. 
Lobaria- fallax, Hoffm. Germ, Y49. 
Cetraria fallax, 4char, Meth, 296; 4 
Cetraria glauca fallax, Achar, Lich. 509. 
5. Cetraria nivalis. Snow celraria. 
Thallus white, yellowish at bottom, net-worked in holes; 
jags rather upright, flattish, deeply and many-cut, torn, 
crisp, crenately toothed; apothecia pale flesh-colour; thal- 
loid border crenulated. 
Liclhenoides lacunosum candidum-glabrum,-ehdivie crispz facie, Dillen 
Muse. 162? , 
Lichen nivalis, Lin. S, P. 1612. 
Hobaria nivalis, Hoffm. Germ. 145. 
Cetraria nivalis, Achar. Meth. 294 ; Eich. 510. 
On dry, gravelly, barren soils, especially if alpine: 
6. Cetraria Islandica. Iceland. cetraria. 
Thallus olive-chestnut colour; whitish bleod-colour at 
bottom, underneath whiter; jags rather upright,. nearly 
linear, many-cut, grooved, toothed, fringed; fertile jags 
dilated; apothecia pressed close, flat, similarly coloured ; 
thalloid border elevated, not in the least cut. 
Lichenoides rigidum, eryngii foliis referens, Radi Syn. 77, 90. 
Lichen Islandicus, Lin. S. P. Y611; Engl. Bot. 1530. 
Physceia Islandica, Michaux Fl. Bav, Amer. 2, 326. 
Lobaria Islandica, Hoffm. Germ. 143. 
Cetraria Islandica, Achar. Meth. 293; Lich. 512. 
Iceland moss. 
On the ground in dry soils, and mountain woods. 
Thallus bitter, but when soaked in water to get rid of 
this bitterness, it yields a nutritive farina, forming a jelly 
on being boiled in water, recommended in phthisis;. forms 
the principal vegetable food of the Icelanders. 
VOL. In 2F 
