78 



THE AMERICAN MONTHLY 



[Mar. 



36 Urceolaria 



13 Umbilicaria 



27 Collema 



28 Leptogium 



Heterothecium 



47 Buellia 



52 Xylographa 



36 Urceolaria 



37 Thelotrema 



Gyrostomum 



Xylographa 



53 Grapliis 



Endocarpon 



67 Trypethelium 



69 Verrucaria 



38 

 52 



63 



65 Segestria. 

 66 Staurothele 



Sp. elipsoid, not simple, multiform, etc., — Continued. 

 1 Th. uniform 



1 Th. foUiaceous n 

 n Apothecia blackened, gyroseplicate 

 n Thallus dark green 

 n Thallus lead colored 



2 Apothecia sessile, exciple paler than the disk 45 

 2 Apo. sessile, exciple coal black 



2 Apo. angulate, exciple softish 



3 Exciple with black disk and white margin 

 3 Ex. with a torn margin 



3 Ex. with an entire margin 



4 Thallus innate in the matrix 



4 Th. uniform or obselete 



5 Immersed in the thallus 

 5 Im. in a stroma 

 5 Innate 

 5 Immersed in thalline warts p 



p Paraphyses distinct 



p Paraphyses obsolete 



5 Apothecia prominent q 



q Turbinate 71 Pyrenastrum 



q Not turbinate 70 Pyrenula 



c Brown a 

 c Colorless b 



a Apothecia scutellaeform 1 



1 Thallus crustaceous or evernaeform 11 Physcia 



1 Th. crustaceous foliaceous 12 Pyxine 

 a Apothecia zeorine or biatorine 32 Einodina 

 a Apo in a stroma 2 



2 Concave in a white stroma 55 Glyphis 

 2 In a verruaceform stroma 67 Trypethelium 



b Apothecia lirelelaeform 53 Graphis 



b Apo. crater i form 1 



1 Urn shaped 60 Acolium 



1 Stipitate 61 Calicium 

 b Apothecia in a stroma 2 



2 In a white stroma rounded or oblong concave 55 Glyphis 

 2 Immersed, paraphyses distinct 67 Trypethelium 

 2 lunate, paraphyses slender, indistinct, or obsolete 69 Verrucaria 



d Brown 1 

 d Colorless 2 



1 Apothecia patellaeform 



1 Apo. immersed 



2 Apo. zeorine 



2 Apo. biatorine 



2 Apo. patellaeform m 



m Stipitate 



m Sessile, spores colorless 



m Sessile, spores decolorate 

 2 Apothecia cephaloid n 



n Stipitate 



n Sessile 

 2 Apothecia immersed o 



o In the thallus 



o In thalline warts 

 e Apothecia urceolate 

 e Apo. globular, prominent 



47 Buellia 



63 Endocarpon 



31 Lecanora 



35 Gyalecta 



43 



43 



Baeomyces 

 46 Lecidea 

 47 Buellia 



Baeomyces 

 46 Lecidea 



63 Endocarpon 

 65 Segestria 



37 Thelotrema 

 70 Pyrenula 



