The English flora - SeaweedAfrica

LICHENES. 135
27. Roccella. Thallus coriaceo-cartilaginous, rounded or
plane, branched or laciniated. Apothecia orbicular, adnate
with the thallus i the disk coloured, plano-convex, with a border
at length thickened and elevated, formed of the thallus and
covering a sublentiform black compact pulverulent powder, con-
cealed within the substance of the thallus.
28. Borrlra. Thallus cartilaginous, branched and laciniated,
the segments free, generally grooved beneath, the margins frequently
ciliated. Apothecia orbicular, peltate, formed of the
thallus beneath ; the disk coloured and surrounded by the elevated
and inflexed border formed also of the thallus.
29. Everxia. Thallus subcrustaceous, branched and lacini-
ated, angled or compressed, cottony within, (intus stuppeus).
Apothecia orbicular, scutelliform, sessile ; the disk concave, co-
loured, with an inflexed border formed of the thallus.
30. Ramalixa. Thallus cartilaginous, branched and lacini-
ated, somewhat shrubby, generally bearing powdery warts,
compactly cottony within. Apothecia orbicular, scutelliform,
stipitate and peltate, plane, bordered, entirely formed of the
substance of the thallus and nearly of the same colour.
b. Thallus subcijlindrical y filamentous, mostly pendent.
u. Thallus ivith a central thread. Apothecia scutelliform, without
a border, ciliated (orhillai).
Fam. XI
V
r .
Usmv.
31. Usnba. Thallus subcrustaceous, rounded, branched,
generally pendulous, with a central ///read. Apothecia (orbillai)
orbicular, terminal, peltate, entirely formed of the substance of
the thallus and nearly 1* the same colour, the circumference
mostly without a border and (generally) ciliated.
/3.
Thallus without a central thread, sour times slightly compri
Apothi eia scutelliform,
t T \M. \\\ CoRNH i. IRIE E.
:;_'. A i.i. < i out a. rAoZ/u* cartilaginous, subfiliform, branch*
ed, prostrate or pendulous, somewhat fistulose and cottony
within. Apothecia orbicular, thick, sea ile, plane orconvex, more
or less bordered, entire!) formed of the thallus and of the same
colour.
lAria. Thallus cartilaginous, branched, within
nearly -olid and cottony. Apothecia orbicular, terminal, ob-
83, Corn* i
liquely peltate, entirely formed of the substance