EXPLANATIONS AND REFERENCES, 

 PLATE CLXXXVI. 



Figures magnified 250 diameters. 



PAGE. 



Fig. 1-4. SCYTONEMA CORTEX, forma Havendii, .... 257 



Figs. 5, (>. " young conditions from bark of trees, . 257 



Fig. 7-9. forma saxicola, a rock form, . ' 257 



" 10-14. SCYTONEMA INTERTEXTUM, five distinctive parts of filaments, 25S 

 Figs. 15, 10. " microgonidia, in developing condi- 

 tions, .... 258 



" 17, 18. <( young conditions, . . 258 



