CRYPTOGAMIA. ALGAE. Lichen. I. Root central. - 6 
lewisles shtalinesy Wack underneath. Saucers few, minute. 
Dicks. — ots > ae “Spleen 
On rocks thinly covered with soil in the Highlands of Scot- 
land, ; 
upright, crowded, curled. 
P Dicks, 9. 8. 
. Saucers few, soenees slightly concave. Leaves 1 or 2 
ines long, paler yellow when young, darker with age. 
On trees, and on old wood. Di. iii, 18. wi 
Mr. Griffith is satisfied that this plant is nothing but the in- 
termediate state between the L. candelarius and parietinus, 
which he believes are the same species, 
L. Saucers reddish yellow : foliage yellow, leaves minute, concolor. 
I. Root central. 
L, Tubercles black : foliage blue black, roundish, plaited, Jacqui'ni. 
curled, smooth ; brown and pimpled underneath. 
—  Facq. mise. ii, 9. 3. pe 
_ Black underneath. Dicks. Leaves thin, tough, leathery, 
circular, fixed to a central root, pimpled, lobed, curled. Tuber- 
cles like targets, roundish, protuberating, sitting, marked with 
serpentine or concentric lines. Jacg. misc, ii. 83. 
The pullus. Dicks. 1. and Bot. arr. ed. ii. Rocks on the 
Mountains of Scotland. 
L. Tubercles black : foliage brown black, wrinkled, reti- torrefac’tus. 
culated and fibrous underneath, 
Hoffm. lich. 2, 1.2-Dill. 30, 118-Fl. dan. 471. 3. 
Plant expanded, circular, 2 or 3. inches over; thick, rigid, 
brittle when dry ; edge indented, segments short, irregularly 
Scolloped, and ragged. Surface black, brownish towards the 
centre, texture like leather, rough, tubercles black semi-globular 
grains. Under side smooth, grey brown, reticulated with veins, — 
no root but in the centre. Horrman. Targets black, oval, like 
protuberating warts, wrinkled, Ditt, or rather marked with 
nearly concentric lines. ; : 
When Lichens consist of only 1 leaf, they must appear dif- 
ferent from those that are complicated, but unless they inva- 
riably are so, or differ in some more material respect, there can 
be no good reason for considering them distinct. I have seen 
such repeated instances of the imbricated Lichens being found 
with a single leaf, and the umbilicated Lichens with many 
leaves, and those so complicated that they may well be said to 
be imbricated, that I am conyinced nature is not limited by any 
such considerations, On these grounds I am decidedly of opi- 
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