KEY TO THE ARRANGEMENT. 7 



Fam. 7. LECANOREI. Thallus crustaceous ; now lobulate, 

 or even branched; but, for the most part, uniform ; 

 adnate to the substrate j hypothallus inconspicuous. 



Sub-Fain. 1. EULECANOREI, Apothecia scutellseform. 



30. PLACODIUM. Apothecia now zeorine; or biatorine. 

 Spores either (most rarely) simple, or of the usual 

 bilocular type, or, commonly and typically polar- 

 bilocular, colourless. Thallus now lobulate, or very 

 rarely fruticulose ; mostly uniform, and oftener 

 yellowish. 



/ 31. LECANORA. Apothecia now zeorine. Spores ellipsoid 

 and oblong, simple, or rarely bi-quadrilocular, or now 

 long-fusiform and plurilocular, colourless. Thallus 

 now lobulate, or rarely fruticulose ; mostly uniform. 



32. RINODINA. Apothecia now zeorine; or biatorine. 



Spores ellipsoid, bilocular, rarely 4-plurilocular, brown. 

 Thallus now lobulate ; mostly uniform. 



Sub-Fain. 2. PERTUSARIEI. Apothecia (reverting in- 

 deed to the scutellaeforni type, but) typically com- 

 pound, and diiform. 



33. PERTUSARIA. Apothecia globular - difform, opening 



by pores, and including (1-00) uucleiform hymenia; 

 or now explanate, and lecanorine. Spores mostly 

 very large, ellipsoid, simple, or bilocular, colourless. 



Sub-Fam. 3. URCEOLARIEI. Apothecia more or less 

 urceolate. 



34. CONOTREMA. Apothecia urceolate, truncate-conoidal ; 



a black proper exciple, veiled, more or less, by an 

 evanescent thalline one. Spores cylindraceous, very 

 long, plurilocular, colourless. Thallus uniform. 



35. GYALECTA. Apothecia urceolate-biatorine, with a 



