Contents 



PART II 



LICHENS, GENERA AND SPECIES 



Genus Cetraria 79 



Cetraria lacunosa 79 



Cetraria Islandica 79 



Genus Usnea 80 



Usnea barbata 80 



Usnea tricbodea 81 



Genus Thelochistes 81 



X author ia parietina 81 



Genus Parmelia 81 



Parmelia conspersa . 82 



pbysodes 82 



saxatilis 83 



" perlata 83 



" caperata 83 



Genus Physcia 84 



Pbyscia leucomela 84 



Genus Umbilicaria 84 



Umbilicaria pustulata 84 



vellea 85 



Dillenii 85 



Mublenbergii 85 



Genus Peltigera 85 



Peliigera canina 86 



apbtbosa 86 



" polydactyla 86 



Genus Sticta 86 



Sticta pulmonaria 87 



" amplissima 87 



Genus Stereocaulon 88 



Stereocaulon pascbale 88 



" tomentosum 88 



Genus Cladonia .88 



Cladonia pyxidata ..... 89 



jimbriata 89 



cristatella 89 



" rangiferina (typical) .... 90 



" cornucopioides 90 



ix 



