PARMELIA. 



211 



coming brown when dry, — below white ; squamules lobate- 

 crenate, free at periphery ; often becoming granulose. Apo- 

 thecia large, reddish-brown; margin thick, at length gra- 

 nulose. 



Not uncommon in various parts of the Highlands, grow- 

 ing on moss and heather, and also on the ground. 



We are indebted to the kindness of Sir W. C. Trevelyan 

 for specimens of a curious erratic Parmelia, recently found 

 by him in Dorsetshire, lying loose on the ground, and roll- 

 ing freely along before the wind."^ It occurs in the form of 

 irregular gnarled ball- or cake-shaped masses, of a light grey 

 colour, and of somewhat firm consistence, each weighing 

 from eight or ten to thirty or forty grains, and being about 

 one inch in diameter, or having a length of three-quarters 

 to one and a half inch, and a breadth of three-quarters to 

 one inch. In general appearance these masses resemble the 

 drawings of Lecanora esculenta and affinis — similar erratic 

 Lichens found in different parts of Asia— as given in Lind- 

 ley's 'Vegetable Kingdom/ f When sectioned, they are 

 found to be somewhat solid, and appear to consist of a con- 



* Its discovery will be found noted in the c Gardeners' Chronicle/ Feb. 9, 

 1856, and < Scottish Gardener/ No. 3, p. 100. 

 f Third edition, 1853, p. 50 c. 



