CRYPTOGAMIA. ALGJE. Lichen. 
27 
(Green Powdery Stellated Lichen. L. pulverulentus. Achar. Prod. 
E. Bot. Parmelia pulverulenta. Achar. Syn. Hook. E.) Oak, beech, 
elm, and other rough trees. Dill. 
Var. 3. Saucers with curled hrims. R. Syn. p. 75. n. 75—The saucers 
of Var. 2. when becoming old, have their outsides arid brims covered 
with minute leaves, so as to appear curled. Lightf. 
Var. 4. Saucers large, purplish black; border white, regular. L . stellari- 
formis. Hoffm. Enum.p. 73. Specimen from Mr. Griffith, who gathered it 
on stones about Garn, and observes that it seems to connect the stellaris 
with the ciliaris. 
Some specimens of the L . stellaris approach so near to the L. obscurus, that 
it is doubtful whether the only difference is not from local circumstances. 
Mr. Griffith. 
L. tilia'ceus. Saucers brown, border white : foliage sea-green, with 
dots of the same colour ; leaves tiled, lobes rounded. 
Hoffm. Enum. 16. 2— {E. Bot. 700. E.) 
Leaves in a circular form, wide-spreading, lobes jagged and indented. 
Saucers greenish when wet. Hoffman. 
(Sea-green Jagged Lichen. E.) On the bark of trees. Dicks, iii. 16. 
L. diffiFsus. Saucers rusty, brown, circular, flattish, raised; border 
whitish, scolloped- foliage glaucous, pale, tiled; leaves with 
many strap-shaped clefts, blunt, curled, powdery. 
J Dicks. 9. 6 — (E. Bot. 858. 
Glaucous Spreading Lichen. Parmelia aleurites. Achar. Hook. L. 
aleurites. E. Bot. E.)—On old pales in Croft-castle Park, Herefordsh. 
Dicks, iii. 17. 
L. physo'des. Saucers red brown; on pedicles: leaves whitish above, 
black underneath, hollow as if inflated: segments jagged, blunt. 
E. Bot. 126— FI Ban. 1186. 2 —Hedw. Theor. 31. 183. 184. 185—X>///. 
20. 49— Hoffm. Enum. 15. 2— Mich. 50. Ord. 25. 1. 2— Jacq. Coll. iii. 
8— Pet. Gaz. 14. 6. 
Grows half upright, variously cut and divided, the shorter plants most cut, 
and assuming a circular figure. Segments blunt, as if lopped at the ends, 
and with two, three, or four clefts. Leaves smooth, grey white, or glaucous 
green, and convex above, hollowed, black, and rough underneath; 
formed of two layers with a hollow between them, which is peculiar to this 
species. The whole plant more or less mealy. Saucers on short foot¬ 
stalks, concave, brown green, or reddish or yellowish brown within, the 
outside colour of the plant. In my specimens those plants only are mealy 
which have no saucers. Dill. Dr. Smith observes, that it is rarely found 
with saucers, but that he has found the mealy protuberances in the same 
plant with the saucers. 
(Inflated Lichen. Parmelia physodes. Achar. Hook. E.) Trunks of 
trees, stones, stems of heaths. P. Jan.—Dec. 
L. centrif'ugus. Saucers red brown; leaves pale yellow green, 
smooth, jagged, pointed from a centre. 
Hoffm. Enum. 10. 3— Bill. 24. 75—Hoffm. Licit. 16. 2— (E. Bot. 2097. E.)— 
FI. Lapp. 11. 2— Buxb. ii. 7. 3. 
Distinguishable at first sight by spreading from a centre to the circumfer¬ 
ence, and gradually decaying in the middle. Linn. Circular, flat, outer 
