76 



THE AMERICAN MONTHLY 



[Mar., 



c Oblong decolorate, Spores colorlss, Th. foliaceous, — Coniimied. 



X Apo. iiuniersed in ihe thallus . 63 Eudocarpon 

 w Apo. from seutella?form becoming black all over and 



lecideoid 12 Pyxine 

 w Apo. urceolate-scutellseform, spores ellip.soid and oblong, 



bi-pluriJocular or muriform pUirilocular 37 Thelotrema 



V Apo. zeoriue or biatorine 31 Lecanora 



V Apo. globnlar opening by a pore at the summit, immersed in 

 thalline warts 65 Segestria 



u Apo. lirellaiform 53 Grapbis 



u Apo. rounded, oblong, concave black 55 Glyphis 



u Apo. immersed in thalline warts 65 Segestria 



u Apo. immersed in a stroma 67 Trypethelium 



t Apo. lirelletetbrm 53 Graphis 



t Apo. globular 70 Pyrenula 

 z Spores decolorate 



z Apothecia. rounded or oblong 56 Arthonia 



z Apo. rounded oblong black 57 Mypocorum 



z Apo. turbinate, prominent 71 Pyrenastrum 

 d Oblong fusiform 

 d Thallus fruticulose 1 



1 Apothecia disk black with a white bloom 



1 Apo. zeoriue 

 d Thallus frondose, villous beneath 

 d Th. lobulate 2 



2 Apothecia zeoriue 

 2 Apo. patellaeform or ctphaloid 44 



2 Apothecia urceolate 4 

 d Thallus uniform 3 



3 Apo. patellaeform or cephaloid 44 Biatora 



3 Apo. rounded oblong, black 48 Lecanactis 



4 Apo. biatorine with a creuulate margin 35 Gyalecta 

 4 Apo. colored with a torn margin 37 Thelotrema 



d Thallus crustaceous 37 Thelotrema 



K 



1 



31 



18 



31 



Roccella 

 Lecanora 

 Solorina 



Lecanora 

 Biatora 



Spores ovoid. 

 1 Colored a 

 1 Colorless b 



a Apothecia urceolate-scutellaeform 

 a Apo. immersed in the thallus 

 a Apo. rounded oblong 1 

 1 Black 

 1 Black diflform 

 1 Difform 

 b Apothecia orbicular 

 b Apothecia rounded or oblong 1 

 1 Not black 



1 Black 2 



2 Apothecia diftbrm with a margin 



3 Apo. difform without a margin 

 b Apothecia lecanoroid 



b Apo. depressed urceolate, globose 



b Apo. cephaloid 



b Apo. scutellaeform 2 



2 Thallus frondose villous beneath 



2 Th. monophyllous or multifid squamulose 



36 Urceolaria 

 63 Eudocarpon 



50 Melaspilea 



57 Mycoporum 



.56 Arthonia 



20 Heppia 



56 Arthonia 



50 Melaspilea 



57 Mycoporum 



Myriangium 



25 Pyrenopsis 



41 Cladonia 



17 Erioderma 

 or crustaceous 



10 Parmelia 



