26 Rev. T. Salwey on the Cryptogamic Flora of Guernsey. 



There are two varieties (unless indeed they are distinct spe- 

 cies) of this plant in Guernsey. In the one the thallus exhibits 

 the same loose mode of growth that it does with us in England 

 and Wales_, but has no soredise ; but in the other it adheres so 

 closely either to the rock or tree on which it grows that it is very 

 difficult to detach the specimen. The surface too of this latter 

 var. ?, and not the edges, is copiously sprinkled with soredise. 

 In the description given of the er^osa in the ^ Suppl. to E. B.^ it 

 is observed, " that sometimes the edges are raised, and producing 

 mealy granules on the under side, assume, although not hollow, 

 an appearance approaching to that common in P. tenella." The 

 soredise however of the Guernsey var. of this plant are on the 

 upper surface of the thallus. The hue of the thallus too, which 

 is of a very pale whitish green, and its being more frequently 

 found investing the dark crevices of rocks than growing on trees, 

 seems to point out a difference of species. The shields also of 

 the former variety are decidedly black, whilst those of the latter, 

 though very minute in my specimens, are of a brown colour. 

 The former variety I have not found in fruit in Guernsey. 



Parmelia obscura. Parmelia crassa. 



a. cycloselis. coarctata. 



/3. ulothrix. saxicola. 



plumbea. elegans. 



lanuginosa. muvorum. 

 brunnea. /3. miniata. 



pezizoides, Suppl. to E. B. 



There is a very beautiful variety of this plant forming ex- 

 tremely thin extensive patches on the rocks of a bright orange 

 colour. The thallus is almost wholly minutely granular, and 

 without apothecia. To the naked eye it looks only like an orange 

 stain upon the rock. 



