22.1 



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palmately pinnate. Veins forked free. 



Geius LIU. Hclmi ithostachys Kaulf. 202 

 Sporangia sessile, arranged in two rows 

 c n the face of the spikes. Fronds consist- 

 ing of a fertile and sterile segment on the 

 same stipe. Sterile segment leafy, trian- 

 gular, 2-3 pinnatifidly decompound. 

 Veins forked, free ; fertile segment consist- 

 ing of a stalked spike which forms a com- 

 pound panicle. Gums LIV. Bctrycliii.ni Sw. 203 



