The English flora - SeaweedAfrica

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174 LICHENES. [Lecidea.
the same colour as the disk—Name ; *#£*£ a small shield, and
edos, form ; from the small shield-like appearance of the apothecia.—From
the Acharian Lecidem those species are here
separated which have a distinctly scaly or imbricated thallus :
as the genus stands here, it differs then from the following one
solely in the nature of the apothecia.—The arrangement of the
species is that of Mr. Borrer.
* Apothecia always black.
1. L. atrdta, Wahl. ? (inky-crusted Lecidea); crust continuous
even minutely tessellated of a greyish rather opaque
black its fragments angular slightly concave, apothecia in the
interstices half-sunk flattish coal-black with an elevated entire
black border. Ach Syn. p. 11. Lichen atratus, E. Bot.
t. 2335 Lecidea coracina, Ach. Syn. p. 11.
Granite rocks in Glen Esk, Angus-shire.— Mr. Borrer says that the
Lichen atratus of E. Bot., though named independently, is perhaps
Wahlenberg's plant.
2. L. atro-cinerea, (ashy-black Lecidea); crust tessellated
greyish-black smooth, apothecia several together depressed
brownish-black with a pale border at length crowded elevated
the border being obliterated. Sm.—Lichen atro-cinereus, Dicks.
Cr. Fasc. 3. p. 14. t. 2. f. 2. E. Bot. t. 2096, (excl. the synonyms
?).
On rocks, Mr. Dickson.—This, Mr. Borrer has not noticed in his
Ms. list : but I presume it is unintentionally omitted.
3. L. atro-dlba, Ach. (black and white Lecidea); crust indeterminate
very thin continuous black with grey roughish convex
crowded warts, apothecia in the interstices coal-black flattish
at length convex with an elevated black border. Sm—Ach.
Syn. p. 11. Lichen atro-albus, Linn.—E. Bot. t. 2336.
Rocks in the north of England, Mr. Turner.
4. L. verruculosa, Borr. Mss. (ivhite-warted Lecidea); crust
indeterminate very thin fibrous black with white convex crowded
smooth warts, apothecia solitary in each wart depressed coalblack
with a border of the same colour. Lichen verrucidosus,
E. Bot. t. 2317.
On rocks, Durham, Mr. Winch.
5. L. fusco-dtra, Ach. (broivnish-black Lecidea); crust greyish
black thin circular with a fine radiating compound inky border,
apothecia sessile flattish coal-black with
margin of their own substance and colour.
a thick elevated
Sm.—Ach. Syn.
p, 12. Lichen dendriticus, Dicks. Or. Fasc. p. 14. E. Bot.
t. 1734.
Rocks and stones, especially flint and quartz.—The Patellaria fusco-
atra, Hoffm. (PI. Lich. t. 54. /. I.), Mr. Borrer remarks, is more like
L. atro-alba or fumosa.
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