126 



PEZIZALES 



B. Thallus scaly or foliose, with Pleurococcus or 



Palmella 



1. Thallus scaly, often with rhizoids; disk not fur- 



rowed 



a. Spores 1-celled 



(1) Hypothecium pseudoparenchymic 



(2) Hypothecium not pseudoparenchymic 



(a) Exciple clear or bright 



(b) Exciple dark to black 



b. Spores x-celled; hypothecium pseudoparen- 



chymic 



2. Thallus mostly with one large leaf; disk often 



furrowed 



a. Spores 1-celled; disk typically furrowed 



b. Spores 2-celled 



(1) Spores hyaline 



(2) Spores dark 



c. Spores x-celled 



d. Spores muriform 



C. Thallus dwarf fruticose, of low erect furcate pode- 



tia; horizontal thallus lacking; spores hyaline, 

 2-celled 



Subfamily Phyllopsorae 



Phyllopsora 201 



Psoromaria 181 

 Psora 195 



Psorella 201 



Subfamily Gyrophorae 

 Gyrophora 210; 31 



Charcotia 212 

 Dermatiscum 212 

 Agyrophora 210 

 Umbilicaria 211; 31 



Sphaerophoropsis 195; 30 



Family 50. CLADONIACEAE 



Zahlbruckner 201 (139) 



Thallus of two kinds, the primary horizontal on the substratum, crustose, scaly 

 to foliose, the secondary consisting of erect clavate, cupulate or filiform, simple 

 to much branched podetia; algae typically Pleurococcus; apothecia terminal or 

 lateral, mostly convex to globose, with proper exciple only, except in Chlorocaulum; 

 spores colorless. 



A. Apothecia with proper exciple 



1. Podetia short, simple, rarely forked; apothecia 

 terminal 



a. Podetia equal or little broadened above 



(1) Podetia scattered over the surface 



(a) Hypothecium clear 

 X. Spores 1-celled 

 y. Spores 2-celled 

 z. Spores x-celled 



(x) Spores fusoid to bacillar, few-celled 

 m. Algae blue-green 

 n. Algae yellow-green 

 (y) Spores filiform, very many celled 



(b) Hypothecium dark; spores 1-celled 



(2) Podetia marginal on a foliose thallus 



b. Podetia broadened above into lobes or 



tongues bearing the hymenium on one side 



(1) No algae below the hymenium; medulla 



uniform 



(2) Algae below the hymenium; medulla with 



thicker strands 



Baeomyces 203; 30 

 Dibaeis 203 



Cyanobaeis 203 

 Heteromyces 203 

 Gomphillus 203 

 Pilophorum 205; 30 

 Gymnoderma 203; 30 



Glossodium 204 



Thysanothecium 204 



