io Splachnidium rugosum. 



Fig. 5. Section across a branch showing the relative arrangement of tissues in 

 the thallus and position of conceptacles. 



Fig. 6. Section of part of the disc showing interwoven filaments with free 

 apices ( x 235). 



Fig. 7. Four stages in the development of a conceptacle (X235). a. The 

 youngest stage hardly to be distinguished from an epidermal cell. b. c. d. Older 

 stages ( x 235). 



PLATE III. 



Fig. i. Older conceptacles with young hairs in process of formation, a. Point 

 of contact of basal process with a large filament ( x 235). 



Figs. 2 and 3. Further stages of Fig. i ( x 235). 



Fig. 4. Conceptacle with developing sporangia. a. Initial cell. b. Young 

 sporangium. 



Fig. 5. Mature conceptacle. 



Fig. 6. a. b. c. d. Successive stages in the development of a sporangium ( x 235). 

 e. Empty sporangium ( x 235). 



Fig. 7. Spores ( x 440). 



Fig. 8. Sporangia of Sacchoriza bulbosa, after Thuret. Recherches sur les Zoospores 

 des Algues. Ann. Sci. Nat., ser. 3, torn, xiv., plate xxx., fig. 6 ( x 330). 



