66 



THE AMERICAN MONTHLY 



[Mar. 



y Apo. scutellaeform 1 



1 Til. frond ose, villous beneath clothed with a pannose hypothallus 



17 Erioderma 

 1 Th. monophylous, or multifid, squamulose or crustaceons 



22 Pannaria 

 1 Tb. Iblliaceous, very rarely fruticulose, gonimia almost always 



27 Collema 



28 Leptogium 



20 Heppia 



25 Pyrenopsis 



50 Melaspilea 



41 Cladouia 



6.'> Eudocarpen 



69 Verrucaria 



concatenate , 

 1 Th. folliaceous, lead colored 

 Apothecia oibicular 



Apo. depressed-globose urceolate, at length opened 

 Apo. rounded or oblong, flat 



mostly cephaloid. variou.sly colored, not black 



immersed in the thallus 



innate 



Apo. 

 Apo. 

 Apo. 

 Apo. 



depressed-globose thallus epiphyllous, passing into a lobn- 



22 Pannaria 



13 Umbilicaria 



50 Melaspilea 



61 Calicium 



1 Pyrenastrum 



-.2 Coinogonium 



10 Parmelia 



late crust 72 Strigula 



2 Sp. ellipsoid or sub ellipsoid, colored a 

 2 Sp. ellipsoid or sub-ellipsoid, colorless b 

 a Sp. fucescent 

 a Sp. brown 1 



1 Apothecia scutellaeform, black gyrose — plicate 

 1 Apo. rounded, oblong, black 

 1 Apo. crateritbrni, stipitate, thallus crustaceous 

 1 Apo. turbinate with an ostiole 

 b Th. of jointed filaments 

 b Th. everniseforra 

 b Th. fruticulose 1 



1 Disk colored differently from the thallus 3 

 1 Disk nnd thallus pale 4 



1 Th. brownish black 24 Lichina 



1 Th. attached to substrate by a single point 26 Omphalaria 



1 Th. orange 30 Placodium 



1 Th. yellowish or flesh colored 31 Lecanora 



1 Th. with podetia 40 Pilophorus 



1 Th. composed of jointed filaments 43 Coinogonium 



3 Apothecia attached to the tips or margin of the thallus 3 Cetraria 



3 Disk concave, apo. often cyathiform 4 Evernia 



3 Thallus rounded cottony within, alike on all sides 6 Alectoria 



