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palmately pinnate. Veins forked free. 
Ge1us LILT.—Helmiithostachys Kaulf. 202 
Sporangia sessile, arranged in two rows 
cn 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. Genus LIV.—Botrychium Sw. 203 
