70 



THE AMERICAN MONTHLY 



[Mar., 



45 Heterothecium 



71 



57 



70 Pyrenula 

 Pyreuastrum 



55 Glyph is 

 Mycoporium 

 61 Calicium 



63 Endocarpon 

 67 Trypethelium 



Umbelicaria 

 22 Pannaria 



57 



45 



56 Arthouia 



Mycoporium 



Heterothecium 



60 Acolium 



1 Spores pluri-locular, colored, — eontinued. 

 1 Spores oblong-ellipsoid a 

 a Apothecia pattellaeform 

 a Apothecia promiueut 1 

 1 Thallus obscure 



1 Thallus turbinate opening with an ostiole 

 a Apothecia rounded or oblong 2 



2 Bordered by a thalline margin 



2 Black 

 a Apothecia crateriform 

 a Apo. immersed 3 



3 In the thallus 



3 In a stroma 

 1 Spores muriform, multi-locular a 



a Apothecia scutellseform 4 



4 Blackened gyrose plicate, spores subellipsoid 13 



4 Spores ovoid oblong 

 a Apothecia rounded or oblong 5 



5 Not black 



5 Black 

 a Apothecia patellseform 

 a Apo. crateriform or urn-shaped sessile 

 a Apo. urceolate 6 



6 Spores ovoid-ellipsoid 



6 Sp. ellipsoid and oblong 

 a Apothecia immersed 7 



7 In the thallus 

 7 In thalline warts 



7 In a stroma 

 a Apothecia prominent 8 



8 Turbinate 

 8 Not tubinate 



1 c Spores colorless or decolorate m 

 m Apothecia reniform 

 Apo. ex pi an ate 

 Apo. orbicular 

 Apo. scutell?eform a 



a Disk black with a white bloom, thallus fruticulose or pen- 

 dulous 1 Roccella 

 a Thallus terete, compressed dichotomously branched and 



intertangled 8 Speerschneidera 



a Disk yellowish orange, thallus mostly folliaceous, ascen- 

 dant, avernpeform 9 Theloschistes 

 a Th. frondose-foliaceous, coriaceous-cartilagenous, under- 

 side with cyphels or spots 14 Sticta 

 a Th. monophylous or miltifid, squamulose or crustaceous 



22 Pannaria 

 a Th. foliaceous or fruticulose, mostly dark green, gonimia 



concatenate 27 Collema 



a Th. foliaceous or fruticulose, mostly lead color 



28 Leptogium 

 Apothecia peltseform b 



b Thallus frondose, villous beneath 16 Peltigera 



b Th. lobulate, squamulose, or crustaceous uniform 



44 Biatora 

 Th. crustaceous, uniform, granulose and tartareous, 

 spores generally large, sometimes minute, numerous in the 

 thekes 45 Heterothecium 



36 Urceolaria 

 37 Thelotrema 



63 Endocarpon 



66 Staurothele 



67 Trypethelium 



71 



Pyrenastrum 

 70 Pyrenula 



m 



15 Nephroma 

 38 Gyrostomum 

 38 Gyrostomum 



b 



