. 
fagin’eus. 
betuli‘nus. 
-ac’teus. 
CRYPTOGAMIA. ALG. Lichen. B. (2) Crustaceous, 
with TUBERCLES. 
Crust whitish, very thin, marked with various black lines 
like Arabic characters, by which ‘it is readily distinguished. 
Dit. ss 
On elms and oaks. "Pp, Jan.—Dec. 
Var. 2. Fructifications large, black, in, hi relief, of no 
‘Tegular figure, bearing a rude resemblance to He rew. characters. 
Hoffm. enum. 3.2. f. (not e. as misprinted. ) 
Mr. Griffith by his specimens and observations, has-satisfied — | 
me, that the above are nothing more than a Spheria in a young ~ 
state, before its proper fructifications are formed. 
B. (2) Crustaceous, with Tubercles. 
ts Tubercles white, mealy: crust white. » 
Haffm, exum. 2, 4 and 7 7. 5-Mich. 53. 2 and 1-Dill. 18. ll. 
A. B. 
At first powdery, when older granulated. “ Tubercles nearly 
flat, white, with a thin border, Dit. 
On the bark of the beech and hornbeam, &c. P. jan,—=Deé. ; 
Var. 2. Tubercles whitish, wrinkled: crust pet oy 
Dill. 18.11. C. D. ‘ 
Dillenius thinks these the same as 1; C. growing on the 
smoother bark of younger trees, and D. as “old and growing on 
walls. 
sens faginens. Linn. Huds. L. albescens. Gmel. syst. veg. 
and Huds. On the bark of hornbeam, beech aed ash. Hups.— 
[And lime trees. Mr. Houtergar.] © > P. Jan.—Dec. 
L. Tubercle white, central: crust white. 
Crust nearly 7 inch diameter, circular, thin, fibrous. Tubercle 
solitary, herical, nearly of the size of a 7a seed. Huns. 
On the trunk and branches of the birch. t.—April. 
L. Tubercles white, not bordered, nelaaphaaal crust 
white. 
‘Facq. coll. iii. 4—Hoffm. enum. 4. 6. 
Tubercles sometimes very pale greenish brown i in the center. 
On rocks and stones. Hups. 520. Te 1 .—Dec. 
atro-al’bus. L. Tubercles white, not bordered ; crust black. 
Facq- coll. ii. 14, 1. = 
Iti is difficult to say which colour forms the crust. Linn. Crust 
wide spreading, thin, firmly adhering, mealy, rough, black, 
or iin i eg gene er vor oa 
