L I C H E N rufescens,,
Bark-coloured Ground Lichen.
CRYPTOGAM1A Algce.
Gen. Char. Male, scattered warts.
Female, smooth shields or tubercles, in which the1
seeds are imbedded.
Spec. Char. Frond coriaceous, rigid, concave, even,
dark reddish-brown; pale, downy, with obsolete
veins, beneath; lobes rounded, with numerous
fruit-bearing processes. Shields in front, vertical,
roundish, dark brown, with a pale border.
Syn. Lichen rufescens. Keeker Muse. 79. A ch a r,
Prod. 166.' With. v. 4 . 7 0 . Hull. 2 9 9 .
L. caninus /3. Huds. 5 4 6 . Sibtli. 3 3 1 . L ig h t/. 8 4 6 .
Lichenoides digitatum rufescens, foliis lactucas cris-
pis. Dill. Muse. 2 0 3 . t. 2 7 . ƒ . 103.
L. peltatum terrestre rufescens. R aii Syn. 77.
Peltidea rufescens. Ach. Metli. 2 8 5 ; excluding the
variety j3 . Winch, v. 2 .6 1 .
E v e n more comm o n th a n L. caninus, t. 2 2 9 9 , w ith w h ic h
i t is freq u e n tly c o n fo u n d ed , b u t from w h ic h it differs suffic
ie n tly , as D illen iu s well rem a rk s, in th e fronds b e in g sma lle r,
th ic k e r a n d m ore r ig id ; th e ir u p p e r sid e co n cav e in conseq
u en ce o f th e in flex ed m a rg in s, v e ry smooth a n d ev en , e x c e p t
w h e n c ra c k e d so as to look as i f v e in e d , o f a d a rk e r sooty
h u e ; tu rn in g re d d is h , o r d e ep c h e sn u t, in d ry in g . T h e
u n d e r side is m ore d ow n y , w ith b ro a d e r, more obsolete or
su p e rfic ia l, v e in s. Sh ie ld s n um e ro u s, smaller, a n d o f a m u c h
d a rk e r b rown.
O u r le a rn ed frie n d A c h a riu s , - in h is Methodus, make s
X . scutatus, 1 .1834, a v a rie ty o f th is ; b u t in a le tte r d a te d
N o v . 12 , 1 8 0 3 , h e , w ith h is a c cu stom ed c a n d o u r, a ck n ow led
g e s th a t h e m a y be m ista k e n , a n d confesses h im s e lf n o t
well a c q u a in te d w ith o u r tru e rufescens. *W*ulfen’s fig u re , in
J a c q . Coll. v . 4 . t . 15, w h ic h seems to u s horizontalis, m a y
h a v e misled A c h a riu s re sp e c tin g th e rufescens.