94 Rev. T. Salwey : List of the scarce Lichens found 



smaller, and usually crowded together in a circular group in the 

 centre of the thallus. The elceochroma is by far the most common 

 species; th^ parasema indeed is of rather rare occurrence. 



Lecidea dubia. Upon barns at Overton and Maryknowle, and at 

 Little Leinthall near Ludlovsr. It is not a common lichen with us. 



L. Griffithsii. Upon old oaks in the Hay Coppice, Herefordshire. 

 We have what is perhaps a variety of this growing upon the scales 

 of some old spruce fir-trees at the Lodge near Ludlow. The apo- 

 thecia are larger and more convex than in the usual state of Griffithsii, 

 and more variable in colour, varying from a pale fawn to a deep 

 claret colour. Mr. Borrer, to whom I sent a specimen, said it much 

 resembled one he had received from Acharius as his Lecanora hy- 

 popta, 



L. aromatica. Upon the mortar in an old wall in Llanfor;^a-lane : 

 scarce. 



This plant has been considered as a state of caruleo-nigricans or 

 vesicularis. If it be so, I see no reason why it should not grow to 

 the same size, and assume the same habit in every respect as vesicu- 

 laris. The vesicularis grows with us on limestone ; the aromatica 

 on mortar : what should prevent the latter, if the same plant as the 

 former, from attaining the same size as the former, seeing they both 

 have a calcareous base ? 



L. sanguinaria. Upon the pales of the Hay Park, Herefordshire, 

 and upon the pales below the Ambry at Croft Castle> Herefordshire. 



L, muscorum. Pentregaer. 



L. scabrosa. An obscure lichen, and probably not uncommon. 

 Upon a wall in Weston-lane, Oswestry, and at Craig-y-Rhu. 



L. Lightfootii. Birch-trees, Llanforda : scarce. 



L. incompta. Upon an old wych-elm at the Hayes near Oswestry, 

 and upon an old maple-tree upon the High Vawr. An inconspi- 

 cuous lichen and of rare occurrence. 



L. quernea. Old oaks, Oswestry, and at the Lodge near Ludlow, 

 and in the Hay Coppice. A very handsome lichen when in per- 

 fection. 



L. aeruginosa. Old gates and posts, Oswestry : not common. 



L. quadricolor. Craigforda and Mynydd-y-Myfyr. These and 

 the Cyrn Moelfre in the adjoining parish of Llansilin are the only 

 habitats I have for this plant. 



L. Pineti. Wood above the house at Llanforda, on the scales of 

 fir-trees. This is a very rare lichen with us, the habitat here given 

 being the only one I know. It grows principally on the base of the 

 stem just above the roots. The pale yellow apothecia present to the 

 naked eye nothing but minute specks on the thin green crust of the 

 thallus. 



L. cornea. Upon oak-trees in the Hay Coppice, Herefordshire, 

 and about the Lodge near Ludlow. 



L. marmorea. This occurs with us upon the roots of old thorn- 

 trees growing in the crevices of the rock, as well as upon the rock 

 itself. It seems to be almost wholly without crust, the shields thus 

 presenting the appearance of minute Pezizce. Fries, who makes this 



