of some Lichens. 285 



19. Physcia pulverulenta, var. arcn/phcea, Ach. 



20. , forma centrofusca, Mer. (Hedw. 1919, p. 230). 



21. , iorma. ffranulata, Mer. (Hedw. 1919, p. 231). 



22. , var. wibricata, B. de Lesd. 



23. , forma vncrophyllina, Mer. (Hedw. 1919, p. 231 ). 



24. , var. lepidota, Mer. 



25. , var. rufescens, Mer. (Hedw. 1919, p. 231). 



26. , var. subpnpillosa, Cromb. Brit. Lich. i. 



27, , var. venusta (Ach.). 



On page 484 of tlie above-inetitioiied paper tlie name 

 Physcia pulverulenta placed before forma elegantella, Mer., 

 imisfc be deleted^ this form belonging to the var. angustatu, 

 and not to the species itself. 



On page 485, line 9 from the bottom, for " minoribus'" read 

 " tenuioribus." 



APPENDIX. 



' Uchenes Rossice e.vsiccati.^ Edited by Prof. Dr. C. 

 MereschkoVSKY. Kazan, 1913. Fasciculi I.-III. 



This exsiccata work, of which Harmand wrote to me " je le 

 troiive id^al sous tous les rapports," is very little known. 

 It cannot be purchased now ; but, when the Jewish domina- 

 tion in Russia is over and order established, those who want 

 to acquire it are requested to apply to Dr. John Briquet, 

 Director of the Botanical Garden in Geneva (Switzerland), 

 to whom I have transferred my rights in this work. 



The three fascicules that have already appeared contain the 

 following species * : — 



Fasciculus I. 



1. Ramalina fra.vinea, var. calicuriforniis. 



2. poiml'ma. 



3. poh/morpha. 



4. Parmelia prolLva. 



5. tubulosa. 



6. rystiolea. 



7. taitrica, sp. n. 



8. Lecanora tristis, sp. n. 



9. perplexa, sp. n.f. 



10. , var. grisea, nov. 



11. crentdataf. 



* I am introducing some necessary corrections into this list, viz. : — 



No. 9. Lecanora jierplexa, sp. n., instead of Z. crenulata. 



No. 11. Lecanora crenulata, instead of Z. ccesioalba. 



No. 36. Lecanora carpinea, which is the right name of Z. anyulosa. 



No. 59. I'armelia caperata, which is the right name of 1\ cylisphora. 



t This name must be put in place of the old one. 



