178 
LINDSAY, ON LECIDEA LUGUBllIS. 
'Ann. des Sc. Naturelks/ 3d ser.^ 17^ 1852, plate figs. 
28 — 30), and to L. hirida, Acli. (Schser., 'Enum./ 96, 
L. H. E., 157; Biatoralurida, Sw., Hepp, 121) ; bnt it differs 
from them in its squamnles being comparatively simple and 
aggregated, and in tlie apothecia being black, fiat, and mar- 
gined throughout. The lichenological student may further 
compare it, in regard to its general external characters, with 
Psora (Lecidea) scalaris, Hook, of SmitVs 'Engl. Bot.,^ 
vol. xi, p. 2, plate 2113 (2d. ed., 1844) ; in regard to the 
relative position on the squamules of the spermogones and 
the apothecia, with Endocarpon sinopicum, Wahl. (Tulasne, 
Mem., pi. x, figs. 19, 20) ; and in regard to the characters 
of the thecse and spores with Sphcsrophoron coralloides, Pers. 
(Tulasne, Mem., pi. xv, fig. 4), and Calicium turbinatum, Pers. 
(Tul., Mem., pi. xv, fig. 15). Fries places it between his 
Lecidea atro-alba and L, panmola. 
While Schserer has classified it according to its thallus, 
Korber has arranged it according to its spores. The latter 
places it in his sub-family Lecidince of the family Lecidece, the 
latter being divided by him into three sub -families, and no 
less than thirty-two genera, which were formerly chiefiy 
included in the single, but comprehensive, genus Lecidea ! 
His Lecidinse are characterised by possessing a crustaceous 
uniform thallus and lecidinic apothecia — black, not coloured, 
and having a proper exciple, formed of a tissue difi'ering in 
colour from the thallus. He arranges it between his genera 
Catillaria and Lecidella, and near the genus Lecidea. The 
diff*erential diagnosis between these is founded on the fact 
that Catillaria has two-locular, hyaline spores; and that 
Lecidella and Lecidea have ovoid or ellipsoid spores in sub- 
clavate thecae, the latter genus possessing also a simple, 
carbonaceous hypothecium. But Korber constitutes this 
lichen the type of a new genus, on which he bestows the 
honoured name of Schserer — the great Swiss lichenologist 
[Schaereria lugubris, ' Syst. Lich. Germ.,^ 1. c.) " Den Manen,^' 
he remarks, " des vortrefilichen um die Wissenschaft afis- 
serst verdienten Schweizer Lichenologen Schserer widme 
ich diese durch ihren Fruchtbau hervorragende Gattung, 
die in vieler Beziehung ein Uebergangsglied zwischen den 
psorinischen und lecidinischen Flechten darzustellen scheint.^^ 
(' Syst. Lich. Germ.,' p. 232.) The essential characters of 
his genus Schsereria are the globose spores, contained in 
linear thecae, and the simple, brownish hj^pothecium. 
I have every wish that the illustrious name of Schserer 
should be honoured in the description of really new species, 
for I think it is at least as little objectionable to employ the 
