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Key to the Genus Ramalina 
Spores sigmoid bistorta 
Spores never sigmoid 
Thallus black-ciliate crinita 
Thallus never black-ciliate 
Thallus fistulous 
Thallus over io mm. alt. 
Apices multifid-dendroid pottinariella 
Apices not multifid-dendroid inflata 
Thallus not over io mm. alt dilacerata 
Thallus efistulous 
Thallus open-reticulate reticulata 
Thallus never open-reticulate 
Thallus erect, caespitose 
Laciniae expanded 
Medulla with adglutinated hyphae testudinaria 
Medulla without adglutinated hyphae 
Coriaceous 
Lobes entire fraxinea 
Lobes laterally digitate v. ampliata 
Membranaceous 
Lobes reticulate 
Apices laciniate crispatula 
Apices not laciniate. Duriaei 
Lobes never reticulate 
Laciniae lanceolate Yemensis 
Laciniae never lanceolate Menziesii 
Laciniae never expanded 
Medulla with adglutinated hyphae 
Laciniae terete 
Sorediate /. cephalota 
Never sorediate 
Apothecia terminal 
Branches slender combeoides 
Branches robust v. robusta 
Apothecia lateral ceruchis 
Branches slender. .tumidula 
Branches angulate .v. intermedia 
Branches lax. flaccescens 
Laciniae bifacial 
Thalline exciple rugose homalea 
Thalline exciple smooth. v. disrupta 
Medulla never with adglutinated hyphae 
Sorediate or soraliate 
Laciniae canaliculate. . sorediantha 
Laciniae never canaliculate 
Sorediate 
Branches longitudinally rugose 
Soredia granular 
