574 Mr. Henderson on the Reproductive Organs o/Equisetum. 



Fig. 12. Spore, with the integument separated into filaments, detached before 



maturity, to show the latter partially unrolled. 

 Fig. 13. Spore and outer tunic, after immersion in dilute tincture of iodine. 

 Fig. 14. Highly magnified portion of the theca ; a. line of dehiscence; 



b. meshes in irregular rows or areolae, in which spiral vessels are 



formed ; c. miiriform meshes, on which the vessels near the line of 



dehiscence incline to annular. 



Figures 3, 5, 9, 10, 1 1, 12, 13 & 14, are magnified 400 diameters. 



