PLATE 6. 



IlLrSTEATIVE OF MjR. AuCHEE's PaPEE " Ojf ApOTHECIA IN SOUIE SCTTO- 

 ]S'E]irACE^ AJTD SzROSIPHOWACEiE." 



Vide Proceedings E. I. Acad., Vol. 2, Ser. 2, p. 85. 



Pig. 1. Ascus mtli 4 spores. 



2. Single spore x 403. 



Prom an unidentified Scytonema. 



3, 4, 5. Apothecia. 



6. Mature apothecium. 



7. Same (in outline) burst, to show protruding asci and para- 



pliyses. 



8. Spore x 400. 



9-1 1 . Showing internal agglomeration of brownish-coloured gra- 

 nules causing swellings of the filaments (iacipient apo- 

 thecia ?) 



Prom Sirosiphon alpinus. 



12. Pully formed apothecium. 



13. Younger apothecium. 



14. Spore x 400. 



15. Ascus, immature, with paraphyses, showing contents con- 



tracted iato a fusiform figure and di-sdded transversely. 



16. 17. Immature asci with paraphyses. 



18. Showing portion of an apothecium burst so as to cause the 



8-spored asci, with paraphyses, to become extraded (the 

 rent portion of the apothecium not shaded). 



Prom SirosipJion puhinatus or S. Heufleri. 



19. Immature apothecium. 



20. Outline of mature apothecium. 



21. Immature asci. 



22. Matujre ascus with 8 spores. 



23. Spore x 400. 



Prom Stigonema mamiUosiim. 



24. Apothecium. 



25. Immature asci with paraphyses. 



26. Spore x 400. 



R. I. A. PROC, SER. II., VOL. II., SCIENCE. b 



