272 GLOSSARY. 



SCANDENT. Climbing. 



SEGMENT. One of the smaller divisions of a pinnatifid frond. 



SERRATE. With saw-like teeth ; said of margins. 



SESSILE. Without a stalk. 



SHEATH. The circle of confluent leaves in Equisetum. 



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 ; it 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. 



