410 
4. CENOTHALAMEiE. PL cell. aph. 
Apoth. sessile, oblique, marginal ; 
thallus leaflike, smooth Cetraria. 106. 
Apoth. rather pedicelled, free ; 
thallus cartilaginous ; lobes fringed Borreria. 107. 
Apothecia nearly sessile, edge free ; 
thal. leaflike, interspersed with soredia Sticta. 105. 
Apothecia nearly sessile, edge free; 
thal . leaflike, tips inflated ; soredia 0 Physcia. 108. 
Apothecia nearly sessile, edge free; 
thallus leaflike, tips equal; soredia 0 .... Parmelia. 109. 
E. Apothecia shieldlike , bordered ; thallus crustaceous, 
adnate. Lecideadeee. 
Thallus figured, scaly, tiled-like, 
raised high around the apothecia Psoroma. 110. 
Thallus figured, lobed, raised 
high around the apothecia Placodium. 111. 
Thallus uniform, raised high 
around the apothecia Rimodina. 112. 
Thallus uniform, elevated around 
the immersed apothecia Urceolaria. 113. 
Thallus figured or leaflike; 
apothecia not sunk in the thallus Lepidoma. 114. 
Thallus uniform; apothecia not sunk in Lecidea. 115. 
F. Apothecia jlattish , plaited , bordered ; thallus shield - 
like, free underneath. Gyrophorideae. 
Thallus leatherlike; 
apoth. meandering plaited Gyrophora. 116. 
G. Apothecia Jlattish , di/form, not bordered ; thallus 
crustaceous, flat, adnate. Spilomideae. 
Apothecia round, black, solid Arthonia. 117. 
Apothecia coloured, powdery Spiloma. 118. 
‘ H. Apothecia cupshaped , bordered ; thallus crustaceous , or 
very thin. Calicidese. 
Apothecia nearly sessile Acolium. 119. 
Apothecia stipitate, border prominent Phacotium. 120. 
Apothecia stipitate, centre swollen ; 
border 0 Strongylium. 121. 
