GLOSSARY. 
Raceme, a bunch of irregular flowerets. 
Rachis, the main stem from the branches upwards; sometimes used 
for the whole stem; secondary or partial, the same correspondently 
on the branches. 
Receptacle, the portion of the veins to which the spore-cases are 
attached. 
Recurved, \ , ,, , 
^ } turned or curved back. 
Reflexed, ) 
Reniform, kidney-shaped. 
Reticulated, of fine net-work texture. 
Rhizome, the part under or on the ground from which the frond 
springs, or root commonly so called, to which the fibres or real 
roots are attached ; the caudex. 
Rhomboidal, diamond-shaped, only rather broader one way than the 
other. 
Root, the main mass at the bottom of the plant whereout it grows, 
including the fibres. 
Secund, pointing one way. 
Segment, divided portion of the leaf; or the leaf itself when joined to 
its neighbour by their bases ; lobe. 
Serrate, toothed like a saw. 
Serratures, saw-like indentations. 
Sessile, tapering off without any distinct leaf-stalk, and merging 
presently in the stem. 
Siliceous, composed of a flint-like substance. 
Simple, single; plain ; uncompounded. 
Sinuate,| ^eliding . crooked • serpentine. 
Sinuous, ) 
Sinus, the inner end of an indentation. 
Soriferous, bearing the sori. 
Sorus, an aggregated mass of thecae or spore-cases. 
Spinulose, spinous; bristly. 
Spores, organs resembling buds or seeds in the lower plants. 
Stamen, pollen-bearing organs in the interior of a flower or blossom. 
Stigma, the point of the pistil or style in the interior of a flower ci 
blossom, receiving the pollen. 
Stipes, the stem or stalk of the frond. 
Stomates, the respiratory pores or openings in the epidermis. 
