Isxxii GENERA. 



■939. WOODWAKDIA. Clusters in separate cells along the midrib. Veins somewhat 

 reticulate at their base. p. 425. 



iii. Ptekide^. 



933. STEUTHIOPTEKIS. Clusters on the whole under surface of the fertile Frond, 

 covered by the involute margin. Barren Eroud different, p. 426. 



930. ALLOSOEUS. Clusters near the margin of frond, which is roUed in over them. 

 Indusium 0. Barren and fertile Eronds different, p. 426. 



982. WOTHOL^ITA. Clusters scattered on the margin and base of the pinnules, par- 

 tially covered by the roUed-in margin of the frond. Under side covered with chaff-like hairs. 

 p. 426. 



931. CHBILANTHES. Margin of Frond membranous : Clusters covered by its inflexed 

 portions. Erond, and Venation of its divisions, pinnate, p. 426. 



934. PTEEIS. Margiu of the Erond continuous, membranous, sharply doubled down over 

 the clusters of fruit, p. 426. 



935. ADIAWTUM. Clusters on the under side of inflexed membranous portions of the 

 frond. Venation flabeUate ! p. 426. 



iv. Hymenophylle^. 



936. TEICHOMANES. Cup entire. Caps, on a central receptacle, the point of which 

 extends beyond the cup. p. 426. 



937. HYMENOPHYLLUM. Cup of 2 valves. Caps, on a short central receptacle. 

 p. 426. 



B. Capsule without a Ring. 



V. OSMUNDE^. 



938. OSMUNDA. Caps, clustered iu a branched spike, p. 426. 



vi. Ophioglosse^. 



939. BOTKYCHIUM. Caps, distinct, disposed in a compound spike attached to a pin- 

 nate frond, p. 426. 



940. OPHIOGLOSSUM. Caps, connate, disposed in a simple, 2-rowed spike, attached 

 to an undivided frond, p. 436. 



IV. MARSILEACE^. 



941. MAESILEA. With creeping Runners, but no true Stem. Er. 2-6, stalked, on the 

 base of the L.-staBc. L. quatemate, on long stalks, p. 427. 



942. PILULAEIA. With creeping Runners, but no true Stem. Er. solitary, on a short 

 stalk at the base of the rush-like L. p. 427. 



943. SALVINIA. Plant floating. Er. membranous, clustered on a short downward branch 

 among the radical fibres, p. 427. 



944. ISOETES. Fniit membranous, placed within the concave, dilated base of the L. 

 Stem 0. p. 427. 



V. LYCOPODIACE^. 



945. LYCOPODIUM. Er. of one cell, opening by a transverse fissiure. L. alternate, in 

 2-4 rows. In some species ihere is also another form of fruit, mth 3 or 4 hunches and as 

 many large seeds, p. 427. 



