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18. COLLEMA (Hoffm.) Fr. 



1. pycnocarpum, Xyl. 



2. leptaleum, Tuckerm. 



3. microptychium, Tuckerm. 



4. flaccidum, Aeh. 



5. nigrescens (Iluds.) Ach. 



6. ryssoleum, Tuckerm. Brattleborough, Frost 



7. pulposum(Bernh.) v. ceelocarpum, Tuckerm. Brattleboro', Frost. 



19. LEPTOGIUM, Fr. 



1. muscicola (Sw.) Fr. Brattleborough, Frost. 



2. lacerum (Sw.) Fr. 



3. dactylinutn, Tuckerm. Brattleborougb, Frost. 



4. crenatellum, Tuckerm. Brattleborough, Frost 



5. pulchellum (Ach.) Xyl. 



6. tremelloides (L. fil.) Fr. 



7. chloromelum (Sw.) Xyl. 



8. myochroum (Ehrh.) Scheer. 



20. HYDROTHYRIA, Russell. 

 venosa, Ross. Brattleborough, Russell. 



21. PLACODITJM (DC.) Xaeg. & Hepp. 



1. vitellinum (Ehrh.) Hepp. 



2. cinnabarrinum (Ach.) Anz. 



3. aurantiacum (Lightf.) Xaeg., & v. flavovirescens, Fr. 



4. rupestre (Scop.) Tuckerm. Brattleborough, Frost. 



5. cerinum (Hedw.) Xaeg. 



6. sideritis, Tuckerm. 



7. ferrugineum (Huds.) Hepp. 



22. LECANORA, Ach., Tuckerm. 



1. Frostii, Tuckerm. Brattleborough, Frost. 



2. rubina (Till.) Ach., x. campestris. 



3. muralis (Schreb.) S cheer. 



4. pallescens (L.) Fr. 



5. tartarea (L.) Ach. 



6. frustulosa (Dicks.) Ach. Brattleborough, Frost. 



7. subfusca (L.) Ach. 



8. Cenisia, Ach. Brattleborough, Frost 



9. paUida (Schreb.) Scheer. 



10. Bockii (Fr.) Th. Fr. 



11. varia (Ehrh.) Fr. 



12. atra (Huds.) Ach. 



13. elatina, Ach., v. ochrophsea, Tuckerm. 



14. cinerea (L.) Fr., & v. laevata, Fr. 



15. epulotica, Ach. 



16. cervina (Pers.) Sommerf., v. squamulosa, Fr., y. discreta, Fr. 



& v. privigna. 



