454 



DR LAUDER LINDSAY ON THE 



Fig. 18. Opegrapha subejigurans, Nyl. 

 Spores ; a. Young. 



b. Mature. 



c. Old, in process of germi- 



nation . 

 Fig. 19. 0. agelceoides, Nyl. 



Spore ; Mature. 

 Fig. 20. 0. spodopolia, Nyl. 



Spores ; a. Young. 

 6. Mature. 

 Fig. 21. Arthonia platygraphclla, Nyl. 



a. Theca. 



b. Spoi'es. 



Figs. 22, 23. Platygrapha longifera, Nyl. 



22. Section of hymenium. 



a. Paraphyses. 



b. Theca. 



c. Hypothecium. 



23. Spores ; a. Young. 



b. Mature. 

 Figs. 24, 25. Pertusaria perfida, Nyl. 

 24. Section of hymenium. 

 ad. Paraphyses. 

 be. Thecse ; b. to which iodine has 



been applied, 

 e. Hypothecium. 

 25 Spores; a. Young. 

 b. Mature. 

 Figs. 26, 27. P. perrimosa. Nyl. 

 26. Section of hymenium. 

 a. Paraphyses. 

 6. Thecse. 

 c. Hypothecium. 

 27- Spores ; a. Young. 

 b. Mature. 

 Fig. 28. Pannaria immixta, Nyl. 

 Spores ; a. Young. 



b. Mature. 



c. Old. 

 Fig. 29. P. gymnocheila, Nyl. 



Spores : a. Mature. 

 b. Old. 



Figs. 30, 31. Psoroma sphinctrinum, Mut. 



30. Spores ; a. Mature. 



b. Old. 



31. Spermatia. 



Fig. 32. Physcia plinthiza, Nyl. 

 Spores ; a. Young. 



b. Mature. 



c. Old. 

 Fig. 33. Ricasolia herbacea, DN. 



var. adscripta, Nyl. 

 Spores ; Mature. 

 Figs. 34—36. Sticta subcoriacea, Nyl. 



34. Section of hymenium. 



a. Epithecial membrane. 



b. Paraphyses. 



c. Theca. 



d. Hypothecium. 



35. Spores in Otago specimens. 



a. Young. 



b. Mature. 



c. Old. 



36. Spores in Wellington specimens. 



a. Young. 

 6. Mature, 

 c. Old. 

 Fig. 37. Sticta filix. Hffm. 



a. Spores ; young and mature, 

 var. parvula, Nyl. 



b. Spores ; mature. 

 Figs. 38-42. Sticta damaco>nis, Ach. 



var. sub-caperata, Nyl. 



38. Portion of thallus; nat. size. 



a. Apothecia. 

 6. Spermogones. 



39. Same spermogones, considerably mag- 



nified. 



40. Diagrammatic section of ditto, consider- 



ably magnified. 



41. Spores; a. Mature. 



6. Old, beginning to germinate. 



42. a. Spermatia. 

 b. Sterigmata. 



Plate XXX. 



Figs. 1-7. Sphairia Lindsayana, Curr. 



1. Portion of leaf of Phonnium tenax, 



Forst, bearing the perithecia of the 

 Sphceria ; nat. size. 



a. Lai-ger, segregated forms of 



perithecia. 



b. Smaller, crowded forms. 



2. Perithecia ; greatly magnified. 



3. 4. Diagrammatic sections of ditto, 



greatly magnified. 



5. Normal spores, magnified 425 d. 1. 



a. Young. 



b. Mature. 



c. Old. 



6. Abortive spores. 



7. Stylospores. 



Figs. 8—15. Spharia Otagensis, Linds. 



8. Perithecia and spermogones, slightly 



mag. 



9. 10, 11. Do. greatly mag. 



