THE CLASSIFICATION OF THE TILOPTEKIDACE.E. 187 



EXPLANATION OF THE EIGUEES IN PLATE. 



Fjo. 1. Part of a young plant of Hajjlosjjora f/lohosa, KjeAhu. x25. 



., 2. J)itto oi ScapJiosjJora sjyeciosaj l\.^elhii. x25. 



.J 3. Sc. speciosa^ Kjell. The oogonia oog. and antheridia an. are 

 almost mature, x 100. 



., -1, H. f/Iobosa, Kjellm. Portion of a branclilet with two adult 

 tetra-nucleate sporangia, and a third which has already 

 discharged its contents, x 100. 



.. 5. Portion cf the lower part of a j^oung specimen of Sc. 

 speciosa, Kjell., showing first longitudinal division of 

 thallus cells, x 100. 



,, 6. Ditto of H. glohosa, Kjell. x 100. 



,, 7. Ilaplospora fjJobosa, limit, mutat., showing oogonia ootj., 

 antheridia an., and sporangia sp. all borne on the same 

 plant. X 75. 



-, 8. Another part of the same specimen as that of Fig. 7. On 

 this there is only one oogonium, but many sporangia, 

 one of the latter showing the chara,cteristic four 

 nuclei. x75. 



Xote. — The antheridia, as also the oogonia and sporangia, are 

 figured in optical section. 



