512 
polydactyla Ach. (Peltidea) 96 
polydactyla Hoffm, (Peltigera) 95 
polydactylon Neck. (Lichen) 96 
polymorpha Ach, (Ramalina) 176 
polymorpha Tayl. (Ramalina) 174 
polymorphus Ach. (Lichen) 176 
polyphylla Hook. (Gyrophora) 393 
polyphylla Schrad. (Umbilicaria) 394 
polyphyllus L. (Lichen) 394 
polyrrhiza Koerb. (Gyrophora) 397, 
399 
polyrrhizos Li. (Lichen) 399 
polyrrhizos Fr. (Umbilicaria) 399 
polyschiza Lett. (Cetraria) 155 
polyschizum Nyl. (Platysma) 155° 
polyspora Nyl. (Lecanora) 250 
polyspora Th. Fr. (Rinodina) 249 
polythecia Tayl. (Variolaria) 362 
polytropa Scher, (Lecanora) 301 
polytropa Ach, (Lecidea) 302 
polytropus Ehrh. (Lichen) 301 
polytropus Sm. (Lichen) 303 
populneui de Brond. (Calicium) 18 
populinus Ehrh. (Lichen) 168 
PORINA Ach. 356 
poriniformis Nyl. (Lecanora) 
POROCYPHUS Koerb. 27 
porphyria 8. F. Gray (Rinodina) 354 
portentosa Duf. (Cenomyce) 416 
portentosa Wain. (Cladoniavar.) 416 
prepostera Nyl. (Lecanora) 286 
pretexta Nyl. (Peltigera var.) 93 
Prevostii Fr. (Gyalecta) 331 
320 
Prevostii Th. Fr. (Lecanora) 328, 
331, 332 
privigna A. L. Sm. (Biatorella) 474 
privigna Nyl. (Lecanora) 474 
privigna Ach. (Lecidea) 474 
privigna 8. F. Gray (Rinodina) 474 
proboscidea Ach. (Gyrophora) 390 
proboscideus L. (Lichen) 390 
proboscidea Tayl. (Parmelia) 132 
proboscidea DC. (Umbilicaria) 390 
proboscideus Huds. (Lichen) 395 
proboscideus Sm. (Lichen) 397 
prolixa Carroll (Parmelia) 145 
prosecha Leight. (Lecanora) 345 
prosechoides Oliy. (Lecania) 345 
prosechoides Nyl. (Lecanora) 345 
prosechoidiza Nyl. (Lecanora) 347 
prosechoidiza A. L. Sm. (Lecania) 347 
Prostii Duf. (Ba@omyces) 404 
INDEX 
prostratula Stirt. (Lecidea) 468 
PROTOCOCCUS x 
protuberans Th. Fr. (Lecanora) 374 
protuberans Sommerf. (Lecidea) 374 
protuberans Th. Fr. (Pertusaria) 374 
pruimatus Dicks. (Lichen) 472 
pruinosa Mudd (Biatorella) 471,475 
pruimosa Cromb. (Lecanora) 472 
pruimosa Hook. (Lecidea) 472 
pruimosus Sm. (Lichen) 472 
prunastri Ach. (Evernia) 161 
prunastri Li. (Lichen) 162 
Pseudo-cyphelle xiv 
Psora Dicks. (Lichen) 243 
psorellum Nyl. (Collema) 69 
PSOROMA S. F. Gray 80, 89 
PSOROTICHIA Massal. 36, 41 
psotina Leight. (Pannaria) 32 
PTERYGIUM Nyl. 43, 44 
pubescens Ach. (Cormecularia) 35 
pubescens Nyl. (Ephebe) 35 
pubescens Li. (Lichen) 35, 123, 124 
pubescens Wain. (Parmelia) 35, 123 
pulicaris Ach. (Lichen) 275 
pulicaris Pers. (Patellaria) 275 
pulius Lightf. (Lichen) 233 
pullus Wulf. (Lichen) 393 
pulmonacea Ach. (Parmelia) 115 
pulmonacea Ach. (Sticta) 115 
pulmonaria Hofim. (Lobaria) 115 
pulmonaria Hook. (Sticta) 115 
pulmonarius L. (Lichen) 115 
pulposulum Nyl. (Collema) 51 
pulposum Ach. (Collema) 50, 488 
pulposus Bernh. (Lichen) 50 
pulverulenta Mudd (Borrera) 235 
pulverulenta Ach. (Parmelia) 235 
pulverulenta Nyl. (Physcia) 235 
pulverulentus Schreb. (Lichen) 235 
pulverulentus Sm. (Lichen) 257 
pulvinata Ach. (Cenomyce) 457 
pulvinata Wain. (Euopsis) 37 
pulvinata Scher. (Lecidea) 37 
pulvinatum Hoftm. (Collema) 76 
pulvinatum Th. Fr. (Stereocaulon 
var.) 412 
pumila 8. F. Gray (Lichina) 44 
pumilus Huds. (Fucus) 43 
punctatus Dicks. (Lichen) 274 
punctatus Dicks. (Lichen) 328, 331 
pungens Floerk. (Cladonia) 449 
pungens Ach. (Lichen) 449 
