U f.
LICHEN cæruleo-mgricans.
Black and Blue Lichen.
CRYPTOGAMIA Alga.
Gen. Char. Male, fcattered warts. Female, finootb
fhields or tubercles, in which the feeds are imbedded.
Spec. Char. Cruft of irregular, imbricated, tumid,
powdery, greyith leaves. Shields black, irregular,
flattifh, in the interftices of the leaves, with a
thick palifh border.
Sy n. Lichen cseruleo-nigricans. Lightf. 8 0 5 . Hud/.
65a. With. v . 4. 10. Hull. 286. Abbot. 2,59*
Dick/. H. Sicc. /a/c. 8. 24.
L. veficularis. Achar. Prod. 94. Relh. 458.
L. paradoxus. Ehrh. Crypt. 206.
Patellaria veficularis. Hoffm. PI. Lich. t. 32. ƒ. 3.
I n the la ft page w e men tioned th e o pinion o f D r . A c h a r iu s
th a t this an d _L. candidus a re n o t diftinfit fp e cie s. W i t h all
d u e deference to fu ch au th o rity , we c an n o t b u t con ceiv e them
diffe rent. L . cceruleo-mgncans g row s on the g rou n d, n o t on
Hones, and confifts o f lon g b ran ch ed tufted fp'ongy roots, h e a r in
g tumid roundifh cluftered le a v e s , greeniffi w h en w e t, g re y
o r b row n when d r y , covered w ith fine m e a ly powder. W e do
n o t find that th e y tu rn b la c k w h en o ld . .mack fhields g row
among th em , g re yifh w h en yo u n g , and furrounded w ith a
th ick paler b o rd e r, w h ic h difappears as they advance in a g e ,
an d th e y then b e com e v a rio u s in fiz e and fo rm , o ften tum id ,
b u t mo re g en e ra lly fiat. S u c h are the charac te rs o f th is p lan t
as w e h a v e found th em in C am b rid g e fh ire fp e c im en s fen t b y
th e R e v . M r . H em fte d , as w e ll as in others from the no rth ;
y e t fo v a rio u s are the ac co u n ts and fen tim en ts o f authors
ab ou t i t th at w e offer ours- w ith great diffidence. W e retain
L ig h t fo o t ’ s fp e cific n am e as o rig in a l and in d ifpu tab le , th ou gh
h e h a s mifquoted D ille n iu s . S u r e ly M r . B o lto n ’ s Spharia
glauca c ann ot be the fame w ith w h a t w e have here defcribed.
Pro fe ffo r H o ffm an n has figured an d illuftrated thefe tw o
L ic h e n s in the m o il adm irab le m an ne r.