110 MR. HENFREY ON MARCHANTIA POLYMORPHA. 



Fig. 14. Free parent-cells about to produce the spores. 



Fig. 15. Parent-cells treated with iodine ; the portions of contents coagulated and the membranes swelled ; 

 some cells burst and emitting contents. No trace of septa. 



Fig. 16. a. Young spores become free, or adhering together in twos and fours, after the solution of the 

 parent-cells ; contents almost colourless ; b. elater with the fibres appearing ; c. portion of an 

 elater more magnified to show the undefined appearance of the fibres. 



Fig. 17. Ripe spores, bright yellow and filled with granules. 



Fig. 18. Perfect elater. 



Fig. 19. Portion of the same more enlarged. 



Fig. 20. The end, to show the continuous condition of the fibre. 



Fig. 21. Germinating spores: a. the membrane brownish, no contents visible; b, b, b. membranes 

 hyaline, a few chlorophyll-vesicles formed; c. treated with iodine which colours the whole 

 brown, and shows granular contents. The dark spots are the deep brown chlorophyll-vesicles. 

 The measurements are fractions of an inch. 



