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



resemblance of Cenomyce caspititia. The pilidia however are truly 

 those of a Calicium ; and the dull brownish green hue of the capitu- 

 lum, surrounded, as it frequently is, by the bright yellow ring of the 

 sporules bursting from the edge of the disc, give the plant a very 

 distinct and peculiar appearance. It is of very unfrequent occur- 

 rence. 



Calicium sphcerocephalum. Probably common upon the old decaying 

 timber of barns, &c., but overlooked from its minuteness, the crust 

 appearing to be scarcely more than a stain upon the wood of a bluish 

 gray colour, in which the young apothecia before they are fully de- 

 veloped appear to the naked eye like immersed black dots. 



C. furfur aceum. Dry banks about Oswestry; on the bank be- 

 tween the pool and the common at the Lodge near Ludlow. 



This is not a plant of general occurrence. The bright pale lemon 

 colour of the whole plant readily points it out. It is quite dissimilar 

 in habit and place of growth from the rest of the Calicia, and has 

 been removed by Dr. Taylor to Bceomyces. 



Opegrapha saxatilis. Sandstone rocks, Craigforda. 

 0. dendritica. On the smooth bark of trees, but not common. 

 Verrucaria gemmifera. Craigforda. 



This plant arrests the eye by presenting the appearance of a ver- 

 digris or bluish gray stain upon the rock : the apothecia are very 

 minute. 



V. gemmata. Upon the bark of old ash-trees, Pentregaer, &c. 



This is the largest of the Verrucariee, and not uncommon upon the 



bark of old ash -trees, where the size of the apothecia contrasting 



with the white ground of the bark, give it a conspicuous appearance. 



V, rupestris. Common upon the limestone rocks at Oswestry, 



upon the Moelydd, and at Pentregaer. 



V. immersa. In the same habitats as the former and at Craig- 

 forda, but less common. The smaller size both of the apothecia and 

 of the cavities in which they are immersed, its gray crust as opposed 

 to the white one of rupestris, and a certain peculiar neatness in the 

 appearance of the whole plant, distinguish it from the former. 

 V. IdEvata. Upon stones in the Morda Brook under Craigforda. 

 V. epipolcea. Limestone rocks on the Moelydd and at Pentregaer. 

 This is a very handsome and conspicuous species ; the crust is 

 often suffused with a pale rose-colour, which, contrasting with the 

 bluish colour of the apothecia, gives this plant a very beautiful ap- 

 pearance. 



V. acrotella, Craig-y-Rhu : scarce. 



V. epigcea. Hay Coppice, Herefordshire. Perhaps not uncommon 

 in a barren state, when it may be overlooked as a young state of 

 some Conferva or Vaucheria. 



V. Hookeri. Mynydd-y-Myfyr : very scarce. 

 Endocarpon miniatum. Limestone rocks, Oswestry; Wickliff rocks, 

 Ludlow, and Downton Castle. 



E. Hedwigii. On the top of the wall opposite the house at the 

 Moor Park near Ludlow, and other similar situations. 



E. late-virens. In fruit on Mynydd-y-Myfyr in the parish of 



