12 KEY TO THE ARRANGEMENT. 



stroma. Spores fusiform, or now oblong-ovoid, quadri- 

 plnrilocular, very rarely muriforrn-multilocular, almost 

 always uncoloured. Thallus uniform. 



55. GLYPHIS. Apothecia rounded, or oblong, concave, 



black, associated together in a white stroma. Spores 

 ellipsoid, and oblong, quadri-plurilocular, brown, or 

 decolorate. Thallus uniform. 



Fam. 4. ARTHONIEI. Apothecia difform, without proper 

 margin, commonly confluent, and now evidently com- 

 pound. 



56. ARTHONIA. Apothecia rounded, or oblong ; now bor- 



dered by an accessory thalloid margin; clustered 

 commonly, or finally confluent in a difform, rounded 

 or stellate pseudo-stroma. Spores (commonly in 

 pyriform thekes) oblong-ovoid, or oblong, or rarely 

 fusiform, 2-4-plurilocular, or, at length muriform- 

 multilocular; brown, or decolorate. Thallus uniform 

 or almost obsolete. 



57. MYCOPORUM. Apothecia rounded or oblong, black, 



finally compound; a difform pseudo-stroma includ- 

 ing (1-6) hymenia. Spores (in sub-pyriform thekes) 

 oblong-ovoid or oblong [bi-quadrilocular, or finally] 

 muriform-multilocular; brown, or decolorate. Thal- 

 lus uniform, or almost obsolete. 



* AGYRIUM. Apothecia rounded or oblong, softish (red- 

 dish) immarginate. Spores ellipsoid, simple,- uncol- 

 oured, or reddish. Thallus scarcely or not visible, 

 represented mainly by a few gonidia, nestling amidst 

 the fibres of the woody substrate. 



Trib, 4, CALICIACEI. Apothecia turbinate-lentiform (cra- 

 teriform) or globose j a proper exciple, which is either 

 naked, and ofteuer stipitate, or bordered by an accessory 



