The English flora - SeaweedAfrica

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176 LICHENES. [Lecidea.
in E. Bot. Suppl. t. 2687. /.
minutely cracked.
1 /3. crust brown more level
On flints, which have been long exposed to the weather, Sussex
Downs.— /3. on a block of close-grained sandstone on the sea-.shore near
Rye, Mr. Borrer.— " The substratum of the lhallus is more obscure and
the warts are more minute and less distinct in L. prominula than in
L. atro-alba. The apothecia too are superficial, not sunk, as in that and
several other of the verrucose Lecidea, in the interstices of the warts.
Their scite, number and uniformly small size, give the plant some resemblance
to L. jnnico/a, from which it differs widely in its thallus, as
well as in the place of growth ; nor indeed are the patelhilce so minute as
in that Lichen." Borr.
11. L. chalybea, Borr. (metallic-black Lecidea); crust thin
leaden-black glossy at length somewhat tartareous minutely
cracked and opaque, apothecia superficial minute black, the disk
flat, the border slightly elevated entire. Borr. in E. Bot.
Suppl t. 2687. f. 2.
On tiles and occasionally on flint, in various places in Sussex ; and
perhaps not uncommon elsewhere, since it is likely to be overlooked
among Leconora exigna and other minute Lichens, which form, in such
situations, the first crop of vegetation. Borr.
12. L. premnea, Ach. (rough-bordered Lecidea^); crust thin
submembranaceous rather soft greyish, apothecia plane sessile
black, the disk internally cartilaginous and white, the border
elevated somewhat wrinkled at length flexuose. Ach. Syn,
p. 17.
On trunks of trees, Mr. Borrer, (Sussex?).— I introduce this on the
authority of Mr. Borrer, not having seen a specimen, nor is it stated in
what part of England it is found.
13. L. parasema, Ach. Meth. (common black-shielded Lecidea);
crust thin greyish uninterrupted somewhat granulated blackedged,
apothecia sessile flat opaque black with a black smooth
border at length convex. Sm.—Ach. Syn.p.17?—L.elceochroma,
Ach. Syn. p. 18. (" certainly" Mr. Borrer.)—Lichen parasemus,
E. Bot, t. 1450.
On the smooth bark of trees, abundant.— Mr. Borrer refers our wellknown
L. parasema to the L. elteochroma, Ach. Syn., (the L. parasema,
eltsoehroma, Lich. Univ. p. 275.) and he observes, " if L. parasema of
the Syn. be really distinct, I know not what it is."
14. L. pinicola, Borr. Mss. (Pine-bark Lecidea); crust diffuse
thin brownish-white somewdiat tartareous, apothecia numerous
very minute very black opaque with a black smooth elevated
border. Sm.—Lichen pinicola, Ach. Meth. p. 66. E. Bot.
t. 1851. Lecidea parasema, b. and d. Ach. Syn. p. 17 and 18,
(according to Mr. Borrer.)
On the scaly bark of old Pine-trees.
15. L. dubia, Turn, and Borr. Mss. (doubtful Board Lecidea);
crust leprous pale-brownish grey indeterminate, apothecia black