The English flora - SeaweedAfrica

132 LICHENES.
6. Endocarpon. Thallus crustaceous or cartilaginous often
lobed or foliaceous. Apothecia globose, imbedded in the thallus,
with a slightly prominent apex and including a nucleus.
7. Pertusaria. 77i#//z/scartilagineo-membranaceous, spreading,
adnate, uniform. Apothecia verruciform, formed of the
thallus, one-or many-celled, each cell containing a nucleus, the
apex depressed, coloured, often distorted.
8. Thelotrema. Thallus crustaceo-cartilaginous, spreading,
adnate, uniform. Apothecium double, the outer consisting of an
open ivart formed of the thallus, the inner (one or two) thin,
membranaceous, breaking away at the top, its disk containing a
nucleus.
(True Lichens).
c. Apothecia ? naked sporules (jgongyli or pulvinuli).
FAM. V. LEPRARIEyE.
9. Lepraria. Thallus crustaceo-leprose, spreading, adnate,
uniform. Apothecia none. Sporules naked, forming the thal-
lus, scattered and conglomerated, free.
10. Spiloma. Thallus crustaceous, spreading, adnate, uniform.
Apotliecia none. Sporules naked, coloured, collected into com-
pact tumid masses.
d. Apothecia opening into depressed or hollow shields or pustules
(variola?).
FAM. VI. VARIOLARIEiE.
11. Variolaria. Thallus crustaceous, membranaceous, ad-
nate, spreading, uniform. Apothecium a suborbicular, scutelliform
cup, formed of the thallus, filled with a powdery or flocculose
substance, which covers an immersed waxy disk containing
imbedded tltcca.
e. Apothecia bordered, discoid, sessile (patelhda?).
Fam. VII. Lecanore^:.
12. Urceolaria. Thallus crustaceous, spreading, adnate,
uniform. Apothecia (patellulce) orbicular, the disk concave, coloured,
immersed in the crust, border formed of the crust and
of the same colour.
13. Lecidea. Thallus crustaceous, spreading, adnate, uniform,
Apothecia (patelhdce) orbicular, sessile, plano-convex, having
a border of the same colour as the disk.
14. Lecanora. Thallus crustaceous, spreading, plane, adnate,
uniform. Apothecia (pateUidce) orbicular, thick, sessile and
adnate, the disk plano-convex, its border thickish, formed of
the crust and of the same colour.