PLATE XI {continued). 



Fig. 



g. Young thecse in different stages of development. 

 h. Mature .spores escaped from thecss. The reaction of iodine on 

 the thecse, paraphyses, and spores is exhibited at a, b, d. 

 8. — Isolated parapliyses, showing the knobbed terminal cells — the seat of 



a dark indigo pigment — and the delicate filaments. 

 9. — Shrivelled or aborted spores, retaining the thecse as caudate appen- 

 dages. 

 10. — Mature thecse, showing moniliform appearance, caused by distensions 



or bulgings of the cell-wall by the spores. 

 11. — Young theca, showing the development of few spores at intervals in a 



ribbon-like protoplasm. 

 12. — Spores. 



a. Mature. 



b. Young. 

 e. Old. 



13. — Section of a spermogone, showing— 



a. Cortical tissue of thallus. 



b. Gonidic layer of thallus. 



c. Medullary tissue of thallus. 



d. Envelope of spermogone. 



e. Sterigmata forming inner walls of spermogone. 



f. Cavity of spermogone full of free spermatia mingled with mucilage. 



g. Free and mature spermatia escaping by ostiole, 

 14,— Sterigmata and spermatia. 



a. Spermatia. 



b. Sterigmata, 



15. — Sterigmata arising from articulated, thick, ramose tubes. 

 16.— Free, mature spermatia. 



