in the neighbourhood of Oswestry and Ludlow. 93 
Oswestry. Common on the Welsh mountains, but scarce with us. 
The apothecia are immersed, but protrude in an oblique direction 
from the thallus ; small, and of a dull opake black colour. 
Endocarpon rufo-virescens. Craigforda and Mynydd-y-Myfyr. 
Common in Wales, but of more rare occurrence with us. 
Lepraria chlorina. Craig-y-RKhu. 
L. Iolithus.. Craig-y-Rhu. 
Variolaria globulifera. Upon old ash-trees at Craig-y-Rhu. 
V. conspurcata. Limestone rocks, Pentregaer. 
Lecidea fusco-atra. Craigforda and Pentregaer. This minute 
Lecidea, with its finely radiating thallus, presents a beautiful appear- 
ance on the surface of quartz or chert. 
L. fumosa. Moelydd and Craig-y-Rhu. The crust forms brown 
smoky patches upon the rocks. It is probably not uncommon. 
LL. petrea. In great abundance and perfection upon the mud- 
stones of the Silurian system about Ludlow, and common also about 
Oswestry. My reason for noticing this common lichen is because 
there is some resemblance to the naked eye between this and lapi- 
cida, and experienced botanists have I believe proposed to unite them ; 
but the crust of dapicida is smoother, more polished, harder, and 
more cream-coloured. The apothecia too are more sunk in the crust 
in lapicida. In petrea they are often surrounded by a whitish border 
formed of the crust, giving the plant the appearance of a Lecanora; 
in a more advanced ‘stage they have an urceolate appearance, the 
border being raised and inflexed ; and the under side of this being 
white, the plant still retains somewhat of the appearance of a Leca- 
nora. ‘The concentric arrangement of the apothecia is usually very 
strongly marked, so that the name of Davies and Dickson (concen- 
trica) ought I think to be restored to it instead of that of petrea, 
to which it has no more title than many others which are equally 
confined to rocks, and which, in fact, expresses nothing peculiar to 
the plant itself. The petrea grows upon soft rocks. I only know 
lapicida as growing upon the hard slaty rocks of the Cambrian sy- 
stem, where it is by no means a common lichen. 
L. prominula. A minute and obscure lichen, varying however 
much in the size of its apothecia. The var. /yg@a of Ach. has been 
sent to me by Mr. Leighton from Haughmond Hill. 
LL. anomala. Acharius characterizes this species as ‘‘ polymorpha, 
nam apothecia, quoad formam et colorem eximié variant ;”” we have 
what I believe to be one of the varieties of this polymorphous species 
growing upon some elm-trees at the Lodge near Ludlow. ‘The crust 
is very thin, smooth, polished, and of a pale whitish colour. The 
apothecia conspicuous, variable in size, and of a brownish black 
colour. 
L. eleochroma and parasema. ‘These lichens have been well di- 
‘$tinguished in the work of Mougeot and Nestler, ‘ Stirpes Crypto- 
game Vogeso-Rheuanz,’ and by Dr. Taylor in the ‘ Fl. Hib.”’ The 
crust of parasema is frequently almost white ; the apothecia scattered 
irregularly about the disc, and larger than in eleochroma. In this 
last the crust is always greenish and granulated, the apothecia 
