L I C H E N horizontalis.
Br own Horizontal Lichen.
CRYPT OGAMIA Alga.
G en. Char. Male, fcattered warts.
Female, fmooth fhields or tubercles, in which the
feeds are imbedded.
Spec. Char. Leathery, fpreading, lobed, polifhed,
glaucous greenifh brown ; beneath covered with
a network of brown veins. Shields handing on
fmall lobes, feflile, anterior, horizontal, round, red-
difh, with a pale notched border.
Syn . Lichen horizontalis. Linn. Manf. 1 3 2 . Achar.
Prod. 1 6 0 . _ Hudf. 5 4 8 . With. v. 4 . 7 2 .
Hull. 3 0 0 . Light/. 8 4 9 . Abbot. 2 6 7 . Dick/. H.
Sicc. fafc. 1 6 . 2 4 .
Lichenoides fubfufcum, peltis horizontalibus planis.
Dill. Mn/c. 2 0 5 . t. 2 8 .ƒ. 1 0 4 .
T?
O U N D o n moift mofly rocks in woods in th e m o u n ta in o u s
p a rts o f G re a t B rita in n o t u n freq u en tly . W e received it from
th e Rev. H . Davies o f A b e r, N o r th W a le s .
I t m ay feein wonderful th a t Linnaeus fhould ever have c o n founded
th is w ith L. venofus, w h ic h neverthelefs appears by
h is h e rb a rium to have b e en th e cafe, n o r did h e defcribe th e
horizontalis till th e p u b lic a tio n o f his Manti/fa in 1 7 6 7 .
T h e fronds creep o n th e moift e a rth amo n g moffes and
grafs, and are o f n o d e te rm in a te fo rm , b u t varioufly lobed,
T h e ir u p p e r furface is a little p itted , b u t otherwife fmooth and
polifhed, o f a glaucous o r greenifh b row n , fometimes fp rin k led
w ith a few m e a ly w a r t s ; th e u n d e r downy, covered almofl
to th e edge w ith a tole rably regula r ne tw ork o f b row n broad
ve ins, leav in g w h ite o b lo n g fpaces in th e ir inte rftic es, an d
p ro d u c in g he re an d th e re a b la c k tufted radicle w h ic h fixes
itfe lf to th e g ro u n d . Shields genera lly folitarily placed o n little
e lo n g a tio n s o f th e frond, h o riz o n ta l, flat, ro u n d ifh , red -b row n ,
furrounded w ith a c ren a te b o rd e r o f th e colour o f th e le a f o n
w h ic h th ey grow.
■June. /. /S o / . 2hA>fy'/ieA' Jez? So*v(trty'. Jiondon<