501 Pertusaria sp.? poor condition, young, only spermogonia seen 501a Bacidia (Bilimba) antillarum Vainio 502 Leptogium marginellum (Sw.) J.E.Gray 503 Parmelia crustifera Taylor 504 Pyxina dresecta (Fée) Nyl. 504a Anthracothecium lubricolum (Fée) Müll.Arg. 505 Parmelia omphalodes Ach. from St Pierre in Gulf of St Lawrence 506 Leptobasidium rhabarbinum (Mont.) Bres. 507 Lecanora chlorphaeiza Vainio 508 Parmelia dominicana Vainio 509 Catillaria (Biatorina) Zahlbrüneri Fink 510 Physcia soredioza (Vainio) Lynge 511 Anthracothecium lubricolum (Fée) Müll.Arg 512 513 Sticta Weigelii v. schizophylliza (Nyl.) Hue 514 Pertusaria praetervisa v. expallens Vainio 515 Parmelia Vainiana Lynge 516 Physcia obsessa (Mont.) Nyl. 517 Parmelia Raunkiaeri Vainio 518 519 Leptogium marginellum (Sw.) J.E.Gray 520 Parmelia blastica Vainio 521 Parmelia martinicana Nyl. 522 523 Parmelia omphalodes Ach from St Pierre in Gulf of St Lawrence 524 Chiodecton cineritium (Ach.) Vainio 525 Parmelia capitata Lynge