272 GLOSSARY. 



SCANDENT. — Climbing. 



Segment. — One of the smaller division.s of a pinnatilid frond. 



Serrate. — With saw-like teeth ; said of margins. 



Sessile.— Without a stalk. 



Sheath. — The circle of confluent leaves in Eqitisetum. 



Sinuate. — Wavy ; said of margins. 



Sinus. — The re-entering space between two lobes. 



SORUS (Pl. Sori). — An assemblage of sporangia ; a fruit dot. 



Spatulate. — Spoon-shaped. 



Spike. — A name given to the fruiting parts of the fern allies. 



Spine. — A sharp point ; a thorn. 



Spinulose. — Thorny; set with small spines. 



Sporangium (Pl. Sporangia.)— A tiny globe in which the spores 



are produced. 

 Spore. — A one-celled body, the fruit of the higher cryptogams ; il is 



produced asexually and is the analogue of a seed. 

 Spore-case. — Same as sporangium; the case in which the spores 



are borne. 

 Sporocarp. — A capsule-like structure enclosing the sori in certain 



fern allies, as in Marsilia. 

 Sporophyll. — A leaf that bears spores, often modified for the pur- 

 pose. 

 Stalk. — Same as stipe. 

 Sterile. — Barren. Said of leaves or stems that do not produce 



spores. 

 Stipe. — The petiole or stalk of the fern leaf which bears the leafy 



portion aloft. 

 Stolon. —A trailing, or often underground, branch. 

 Stomata. — Minute openings in the leaves of plants. 

 Subulate. — Awl-shaped. 

 Ternate. — With three nearly equal divisions. 

 Tomentose. — Covered with matted wool. 

 Tomentum. — Close matted woolly hairs. 

 Tooth. — .The smallest division of a frond ; a slender prolongation 



from the sheath in Equisetum. 

 Tortuous. — Bent or twisted in different directions. 

 Tripinnate. — Three times pinnate. 

 Truncate. —Appearing as if cut off abruptly. 



