Prothalli in Sporangia of Todea . 243 
Fig. 3. Prothallus with antheridium from a closed sporangium, exposed to daylight, after 
21 days; a rhizoid-cell is present, x 260. 
Fig. 4. Data as in last. There is no rhizoid-cell, but the rudiment of a lateral branch (/.) has 
been formed, x 260. 
Fig. 5. Prothallus (enclosed by exosporium) and antheridium from a closed sporangium ; 
darkness, 26 days, x 260. 
Fig. 6. Prothallus grown from a free spore on damp blotting-paper ; darkness, 26 days, x 260. 
Fig. 7. Small antheridium borne by two prothallial cells, one of which probably represents the 
stalk of the antheridium. From a closed sporangium ; darkness, 22 days. x 260. 
Fig. 8. T. hy 7 nenophylloides. Small prothallus with antheridium (containing chlorophyll). 
From a sporangium ; daylight, 32 days. x 260. 
Fig. 9. T. hymenophylloides. Prothallus from a sporangium ; daylight, 32 days, x 260. 
Fig. 10. T. hymenophylloides. Prothallus from a sporangium ; daylight, 46 days. The upper 
cells probably represent an abortive antheridium. x 260. 
Fig. 11. T. Fraseri. Prothallus from a free spore on damp blotting-paper; daylight, 
36 days, x 260. 
Fig. 12. T. hymenophylloides. Prothallus from a free spore on damp blotting-paper ; daylight, 
32 days, x 260. 
Fig. 13. T. Fraseri. Spore germinating in tap-water ; daylight, 3 days, x 260. 
Fig. 14. T. Fraseri. Young prothallus from a spore in distilled water ; daylight, 3 days, x 260. 
Fig. 15. T. hymenophylloides. Young prothallus from a spore in water; darkness, 25 days, 
x 390- 
Fig. 16. T. hymenophylloides. Young prothallus from a spore in a sporangium attached to 
a pinna on damp blotting-paper; daylight, 13 days. x 390. 
Fig. 17. T. hymenophylloides. Prothallus from a spore in water; daylight, 19 days, x 390. 
Figs. 18-20. T. Fraseri. Prothalli from spores on damp blotting-paper; darkness, 33 days, 
x 260. 
