EXPLANATION OF PLATE XV 



Pliysanini confntitin Maclir. ;/. /;., p. 64. 

 Fig. \. Sporangia on a bit of leaf, X 4. 



Fig. 1 a. Capillitiiim, X 800. 

 Fig. 1 /;. A single spore, X 1200. 



Pliysarum notahilr Machr., p. 80. 

 Fig. 2. A group of sporangia, stipitate form, X 10. 

 Fig. 2 a. A single spore, X 1200. 



Pliysarum fla-vicomuiri Berk., p. 93. 

 Fig. 3. A cluster of sporangia, one closed, X 10. 

 Fig. 3 a. A single spore, X 1200. 



Pliysarum trnpualr Macbr., p. 82. 

 Fig. 4. Sporangia, X 10. 

 Fig. 4rt. Capillitium, X 800. 

 Fig. 4 /;. A single spore, X 1200. 



Cratir'ium in'niuluin (Leers) Fr., p. 107. 

 Fig. 5. Sporangia, tlie stalks unusually long, X 15. 



Pliysarum pnirlralc Rex, p. 70 

 Fig. 6. A group of sporangia; the calcareous crust has fallen in all. 

 Fig. 6 a. A single sporangia, enlarged to sho\v columella, X 20. 



Pliysarum nicarar/uinsr Macbr., p. 83. 

 Fig. 7. A group of sporangia, X 15. 

 Fig. 7 a. Capillitium, strongly calcareous, X 800. 

 Fig. 7 h. A single spore, X 1200. 



See also PI. XVIL, Figs 11 and 11 «. 



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