The English flora - SeaweedAfrica

Lccidea.] LICHENES. 173
upothecia minute very numerous roundish black (often brownred)
with a white border incorporated with the crust. S,/t.
Ach. Syn. p. 137.— Lecanora cyrtttspis, Ach. Lick. Univ.—
Lichen punctatus, Dicks.—E. Bot. t. 450.
On rocks and stones, frequent.—The colour of the Mir. «. of this
Lichen, on which it chiefly depends for its character, seems to me to
be owing to the oxyde of iron, which tinges other species growing on
the same stones. I follow Acharius in making the V. punctat. a var.
of it : but if either be really distinct from V. cinerea or calcarea, I
should prefer considering the var. £. the type of the species.
6. U. rufescens, (reddish Urceolaria); crust indeterminate
thin tartareous tessellated brown, apothecia small dark-chestnut
immersed at length flat with an elevated entire margin. Borr.
— Sagedta rufescens, Ach. Syn. p. 135. Lccidea rufescens, Borr.
in E. Bot. Suppl. t. 2657.
Rare. On sandstone (walls?) at Gorleston, Suffolk, Mr. D. Turner.
— Mr. Borrer remarks that this approaches in structure the Lccidea
cechumena, £. athroocarpo, which indeed corresponds in its sunken shields
with some Acharian Urceolarice. " We do not understand satisfactorily,"
sa\ s Mr. Borrer, " the distinction between the Acharian genera Urceolaria
and Sagedia t and since every gradation is to be found, among the crustaceous
Lichens, between completely immersed and completely protuberant
apothecia, it is perhaps best to refer, for the present, to Lccidea,
all those species in which the apothecium has a proper margin, whether
it be or be not, surrounded by an accessory margin from the thallus."
0, iS — Mr. Borrer, in a list of species of certain British genera ofLichen*
which he has been so good as to communicate to me, enumerates 4
of the Acharian Genus Gyalecta ; but none is figured in K. But., and
Acharius alone seems to be the authority for two (G. epulotica and G.
and the obser-
celhalea). I am myself unacquainted with them :
vations of Mr. Borrer will, I think, justify me in not introducing them into
our British list. Of the 4 species he Bays :"1. G.epulotica, Ach. Syn. p. !>•
I am bo imperfectly acquainted with this as not to know how it ditlers
from Urceolaria Acharii, notwithstanding Acharius' u toto catloabha
Hncta." >. G. bryophOa, Ach. Sun. «>. p. I still regard thi- as a state of I '.
tcrupota, (under
p>. Ach. Si/n. />. '.>.
which plant it is quoted). 3. G. M'ahlcnbcriiuuui,
We have on Kims iu SuSSei what I suppose t
this, hut I am doubtful whether it he uot a Mr. of Leaden marmorca.
1. G.cethalea, Ach. Syn. /> l