10 KEY TO THE ARRANGEMENT. 



Sub-Fam. 2. BIATOREI. Apothecia sessile; the exciple 

 paler than the disk. 



44. BIATORA. Apothecia patellseform, or oftener cepha- 

 loid. Spores either ellipsoid and simple, or oblong 

 and bi-quadrilocular, or fusiform passing into acicular 

 and finally plurilocular, colourless. Thallus now 

 lobulate; mostly uniform. 



45. HETEROTHECIUM. Apothecia patellseform; the ex- 

 ciple often thickened and lecanoroid. Spores for the 

 most part large, from ellipsoid becoming oblong, and 

 either simple, or bi-plurilocular, or muriform-multi- 

 locular ; brown, or decolorate. Thallus uniform. 



Sub-Fam. 3. EULECIDEEI. Apothecia sessile; exciple 

 coal-black. 



46. LECTDEA. Apothecia patellaeform, now cephaloid. 



Spores from ellipsoid becoming fusiform, and finally 

 acicular ; either simple, or more rarely bi-quadri-pluri- 

 locular, colourless. Thallus now lobulate, or very 

 rarely caulescent ; but, for the most part, uniform. 



47. BUELLIA. Apothecia patellaeform. Spores ellipsoid 



and oblong ; from simple becoming bi-quadrilocular, 

 or finally muriform-multilocular ; brown, or decolor- 

 ate. Thallus now lobulate ; mostly uniform. 



Trib, 3, GRAPHIDACEI, Apothecia difform, oftener elon- 

 gated (lirellseform), margined (normally) only by the 

 proper exciple ; now itself indistinct. 



Fam. 1. LECANACTIDEI. Apothecia rounded more or less, 

 or also, less commonly, elongated ; margined. 



48. LECANACTIS. Apothecia rounded, or more rarely 



oblong, black. Spores from dactyloid becoming at 

 length fusiform-oblong, quadri-plurilocular, colourless. 

 Thallus uniform. 



