Pl.cell.aph. 4. CENOTHALAMEiE. 106. Cetraria. 433 
4. Cetraria glaaca. Sea-green cetraria „ 
Thallus sea-green, rather shining, underneath brownish 
black, sinuately lobed ; jags deeply cut, torn, complicated, 
ascending; apothecia elevated, bright bay ; thalloid border 
wrinkled. 
Lichenoides endiviae foliis cnspis splendenlibus, subtus nigricantibus, 
Dillen Muse. 192. 
Lichen glaucus, Lin. S. P. 1615. 
Lobaria glauca s Hoffm. Germ. 149. 
Cetraria glauca, Achar. Mein. 296; Lich. 509. 
On the trunks of trees, and rocks.. 
/3. fallax. Thallus White on both sides, underneath fre- 
quently spotted with black. 
Lichen glaucus, Wulf. inJaeq. Colt. 4. 
Lichen fallax, Weber FI. Germ. 244. 
Lobaria fallax, Hoffm. Germ. 149. 
Cetraria fallax, Achar. Meth. 296. 
Cetraria glauca fallax, Achar. Lick. 509. 
5. Cetraria nivalis. Snow cetraria . 
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. 
Lichenoides lacunosum candidum glabrum, endivite crispse facie, Dillen 
Mum. 162? 
Lichen nivalis, Lin. S. P. 1612. 
Lobaria nivalis, Hoffm. Germ. 145. 
Cetraria nivalis, Achar. Meth. 294; Licit. 510. 
On dry, gravelly, barren soils, especially if alpanei 
6. Cetraria Islandica. Iceland cetmria. 
Thallus olive-chestnut colour, whitish blood-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 rigid um, eryngii foliis referens, Raii Syn. 77, 90. 
Lichen Islandicus, Lin. S. P. 1611 ; Engl. Bot. 1530. 
Physcia Islandica, Michaux FI. 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, 
tol. i. 2 F 
