284 Piof. Dr. C. IMeresclikovskj's Diagnoses 



paper, "Matdriaux pour une Monographiedu Genre Graphis,^^ 

 ill * Annuaiie du Conservatoire et Jardin boianique de 

 Geneve,' vol. xxi. 1921. Anotlier set of new species, 

 varieties, and forms of different kinds of lichens, also accom- 

 panied with Latin diagnoses, can be found in my paper 

 " Scheduloe ad Lichenes ticinenses exsiccatos " in the same 

 'Annuaire du Conservatoire botan. &c.,' vol. xxi. 1919, 

 pp. 145-216. 



In my previous paper in this Magazine, " On some new 

 Forms of Lichens" (Ann. & Mag. Nat. Hist. ser. 8, vol. vi. 

 p. 482, Nov. 1920), the two following should be added to 

 the list of forms belonging to Physcia pulverulenta (pp. 484- 

 485) : — forma nigricans, Mlill. Arg. (Classif. p. 35 ; Flagey, 

 Lich. d. 1. Franche-Comtd, i. p. 182), and forma nut^a, Flarm. 

 (Lich. d. Fr. p. 634). 



Correction. 



While my paper "On some new Forms of Lichens,^' 

 recently publislied in this Magazine (vol. vi. 1920, p. 482), 

 was in the press, I sent to the editors two supplementary 

 forms to be added to those belonging to the species Fhyscia 

 pulverulenta (/. c. p. 484), of which one — forma nigriams, 

 Mull. Arg. — has been erroneously put as a form of the var. 

 angustata, to whicii it does not belong, being a form of the 

 species itself, while the other — forma nuda, lierm. — has 

 been omitted altogetlier. 



After correcting these errors and adding another form 

 which I previously omitted (forma deminuta, Cromb.), the 

 list of forms belonging to Physcia pulverulenta will now read 

 as follows : — 



1. Phi/scia pulvsfulenta {Schrtih.), Nyl. 



2. , forma delicata, Mer. 



3. , forma deminuta, Cromb. Brit. Lich. i, p. 306. 



4. , forma (jranuhsa, Mer. (Hedw. 1919, p. 227). 



5. , &\xhi»vnmfruticidosa, Mer. (Hedwr. 1919, p. 228). 



6. , forma nigricans, Miill. Arg. (Classif. p. 35). 



7. , forma nuda, Harm. Lich. d. Fr. p. 634. 



8. , forma ^jo//^«, Flot. 



9. , forma rugosa, Mer. (Hedw. 1919, p. 229). 



10. , forma subvenusta (Nyl.). 



11. , forma turgida (Schaer.), Harm. 



12. , I'orma turgidida, Mer. 



13. , forma venustoides, Mer. (Hedw. 1919, p. 229). 



14. , var. angustata (Hoffm.), Ach. 



15. , forma couvexa, Mer. 



16. , forma elegantella, Mer. 



17. , forma nuda, Mer. (Hedw. 1919, p. 230). 



18. , var. aquiloides, Aler. 



