34 HERRE 



ee. Apothecia biatorine or lecideine LVII. Blastenia 



dd. Spores brown, bilocular to muriform. 



/. Apothecia urceolate; spores muriform from beginning. 



XVIII. Diploschistes 

 ff. Apothecia not urceolate. 



g. Spores with a distinct halo. . . .XXIII. Rhizocarpon 

 gg. Spores without a halo. 



h. Apothecia lecideine LXI. Buellia 



hh. Apothecia lecanorine LXII. Rinodina 



cc. Spores simple to multilocular, but not polar-bilocular; color- 

 less. 



i. Apothecia lecideine. 



j. Spores simple XIX. Lecidea 



jj. Spores bi- to multilocular. 



k. Spores bilocular XX. Catillaria 



kk. Spores 4-16 locular 



/. Thallus without cortex, areolate or uniform. 



XXI. Bacidia 



II. Thallus with cortex; of swollen or plicate 

 warts or squamules . .XXII. Toninia 

 ii. Apothecia lecanorine. 



m. Apothecia single or grouped, immersed in thai- 

 line warts; disk very narrow; spores large to 



very large XLIL Pertusaria 



mm. Apothecia solitary, not immersed in thalline 



warts ; disk relatively broad. 

 n. Spores simple. 



o. Paraphyses free, simple; spores small to 



medium. 



p. Spermatia thread-like; thallus variously 

 colored but not orange-yellow. 



XLIII. Lecanora 



pp. Spermatia ellipsoid; thallus orange-yel- 

 low XL VII. Candelariella 



oo. Paraphyses branched and entwined; spores 



quite large XLIV. Ochrolechia 



nn. Spores bilocular. 



q. Sterigmata exobasidial. 

 r. Thallus orange-yellow ; spermatia ellipsoid. 

 XLVII. Candelariella 

 rr. Thallus not orange-yellow; spermatia 



thread-like XLV. Lecania 



qq. Sterigmata endobasidial; thallus marginally 



lobed or of more or less lobate squamules. 



XL VI. Placolecania 



