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Pl.cell.nph. 4. CENOTHALAMEiE. 106. Getraria. 433
4. Cetraria glauca. Sea-green celraria,
Thallus sea-green, rather shining, underneath brownish
black, sinuately lobed ; jags deeply cut, torn, comjjlicated,
ascending; apotliecia elevated, bright bay ; thalloid border
wrinkled.
Lichenoides endiviie foliis crispis splenderrtibus, subtus nigricaatibus^:
Dillen Muse. 192.
Lichen glaucus, Lin. S. P. 161 5.
Lobaria gliiuca, Hoffni. Germ. 149.
Cetraria glauca, Achar. Meth. 296; Lich. 509.
On the trunks of trees, and rocks.
^.fallax. Thallus white on bot-h' sides, uederneath frequently
spotted with black.
Lichen glaucus, IVulf.in Jncq. Coll. 4.
Lichen fallax, Weber Fl. Germ. 244.
Lobaria falJax, Hoffm. Germ. 149^.
Cetraria fallax, j'c/iar. Meth. 29G.
Cetraria glauca f;illax, AcJiur. Lich: 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 lacunosumcandidumglabrum, endiviiE crispae facie, Dillen
JIusc. 162?
Lichen nivalis, JL?'«. S. P. 1612.
Lobaria nivalis, Hoffm. Germ. 145.
Cetraria nivalis, Achar. Bleth. 294; Lich. 510.
On dry, gravelly, barren soils, especially if alpine;
6. Cetraria Islandica. Iceland cetraria.
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 rigidum, eryngii foliis referens. Rail Syn. 77, 90.
Lichen Islandicus, Lin. 'S. P. 1611 ; Engl. Bot. 1530.
Physcia Islandica, Miclicnix Fl. Bav. Amer, 2, 326.
Lobaria Islandica, Ho'fm. Germ. 143.
Cetraria Llandica, Achar. Meth. 293 ;
Iceland moss.
Lich. 512.
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.
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