96 Rev. T. Sulwey ; Lest of the scarce Lichens found 
Lecanora periciea. This is an obscure and by no means a com- 
mon lichen. It grows with us occasionally upon old oak- and ash- 
trees; upon an ash-tree in a field south of Treflach-lane, about a 
quarter of a mile from Croeswilin. 
LL. squamulosa. On the Moelydd, and upon the rocks at Pentre- 
gaer. 
L. glaucocarpa. Craig-y-Rhu, but barren. The crust of this 
plant consists of a number of thick, smooth, hard scales, here and 
there collected together, but more usually scattered, wavy, and 
rounded in the centre ; in colour varying from a glaucous to a dark 
brown in an old state, and the younger ones white at the edges. It 
. grows upon the perpendicular face of a limestone rock. 
LL. rubra. This is a very beautiful: hehen and of rare occurrence. 
The only two habitats I know for it are upon the walls of Wigmore 
Castle in Herefordshire, and at Craig-y-Rhu in the parish of Oswes- 
try... In both habitats the plant grows upon patches of decayed 
Alypna hanging loose from the stone. 
L. hematomma.. Craigforda, Craig-y-Rhu, &c. 
Parmelia glomulifera. Upon a wych-elm at Llanforda. ‘There is 
only a single plant of this upon the tree in question, and it is at pre- 
sent the only English habitat I know for it. I have watched this 
plant for upwards of twenty years, and cannot perceive that it has 
either increased or decreased. It has glomeruli, but no apothecia ; 
many of the Parmelie certainly seem to propagate themselves by 
buds or gonidia without apothecia. The shields of scortea and of Ja- 
nuginosa are I believe yet a desideratum in English botany, and those 
of proboscidea, perlata, Borreri and others are very rare, even where 
the plant itself is not uncommon. I cannot but suspect from the 
above instance, that the apothecium is at all events the only mode 
by which this particular species is propagated. Dr. Taylor considers 
the glomeruli of the present plant as the only distinction between 
this and herbacea. I confess I cannot be of this opinion. Even Fries, 
so prone as he is to diminish species, though he removes. both of 
these to the genus Sticta, and in which I think they may well be 
placed, still keeps them distinct. Dr. Taylor also considers that they 
would rank as well with the Sticte as with the Parmelie. Both of 
them grow in great profusion in the wooded parts of Wales, often 
upon the same trees ; but whether in a wet or dry state, they equally 
strike the eye as being distinct ; but most so in a dry state, the smoky 
white colour of the thallus of the glomulifera contrasting with the 
brownish green of that of herbacea. It is also thicker and more 
leathery, and not so much wrinkled. 
P. herbacea. Upon an old wych-elm on Bringewood Hill, oppo- 
site Downton Castle, in Herefordshire. 
P. caperata. Craigforda and other places about Oswestry, but not 
common, and usually barren. 
P. conspersa. Craigforda: not common. The var. stenophylla of 
Ach. grows upon the sandstone rocks there. 
P. Borreri. Woodhill and Porkington, but with us always barren ; 
this plant is scarce with us. 
