1068 Stevens.—Sporangia and Spores of Aneimia phyllitidis. 
Fig. 18. Section of immature spore through its apex, showing the spore coat thinner there than 
elsewhere. Endospore not yet laid down, x 860. 
Fig. 19. Surface view of immature spore of the age shown in Fig. 18. x 860. 
Pig. 20. Section through mature spore, showing exospore and endospore, the former with a line 
of cleavage at the angle and the latter not lining the exospore at this place. The protoplast has 
receded entirely to one end of the spore, x 860. 
Fig. 21. Surface view of mature spore, showing wall sculpturings and lines of fission through 
the spore coats down the three angles, x 860. 
