PARMELIA. 



203 



pitch -coloured, from tnembranaceous-lacinulate passing into 

 a terete-corniculate or a capillary condition ; apothecium of 

 somewhat similar colour to thallus. 



The common variety is sinuate-lacinulate : the lacinulae 

 somewhat concave or flattish, broadish or linear, sometimes 

 granulose at margins, and imbricated.^ (E. B. 653.) There 

 are three other well-marked varieties : var. stygia,^ in which 

 the lacinulae are palmately multifid, sublinear, convex, re- 

 curved at apices, sometimes granulose or verrucose (E. B. 

 2048) ; var. tristis, in which the thallus is somewhat fruti- 

 culose, horny-cartilaginous, rigid, the lacinulae fastigiate, te- 

 rete-compressed, dichotomously ramose, with naked or gra- 

 nulose margins ; apothecia terminal, plano-convex ; and var. 

 lanata, in which the lacinulae are setaceous-filiform, terete, 

 intricate, often twisted, dichotomously ramose (E. B. 846). 

 The two latter varieties were placed by the older Lichenolo- 

 gists in the genus Cornicularia, a classification which appears 

 justified by the nature of their spores, which resemble those 

 of Cornicularia and Usnea. Those of var. tristis are oblong 

 or oval-oblong, small, colourless, double-walled ; those of 

 var. lanata are ellipsoid, but otherwise similar. All these 



* The "Fahln-laf " of Sweden and Norway, 

 t The " Blackalls-laf " of Sweden and Norway. 



