790 GLOSSARY. 



Sepal. One of the floral leaves of the calyx. 



Septate. Divided into compartments, as the wall of the ovary ; also applied 



to fruits, as the orange. 

 Septicidal. Applied to capsules or pods in which dehiscence takes place 



along the sutures or dissepiments (p. 411). 

 Septifragal. Applied to capsules in which the wall of the fruit or carpels 



separate from the dissepiments. 

 Sericeous. Applied to a leaf surface when the hairs are extended in 



one direction giving the leaf a silky or satiny appearance (p. 54). 

 Serrate. A leaf margin in which the teeth are directed toward the sum- 

 mit, as in long Buchu. 

 Sessile. Having no stalk or appreciable support ; applied to leaves, 



flowers and stigmas. 



Setaceous. Provided with stout hairs or bristles. 

 Silicic. A broad silique-like fruit, as in the shepherd's purse. 

 Silique. A narrow, elongated, 2-valved, dehiscent capsule, as in the 



mustard. 

 Sinuate. Applied to the margin of a leaf which is strongly undulate, as 



in witchhazel. 



Sinus. The angle between two lobes of a leaf. 

 Sorosis. A fleshy, multiple fruit, as in mulberry (p. 420). 

 Sorus. An aggregate of sporangia in the ferns (p. 89). 

 Spadix. A spike in which the axis is more or less fleshy. The spike 



is usually surrounded by a large bract (spathe), as in the Jack-in- 



the- Pulpit. 

 Spathe. The conspicuous bract subtending or surrounding a spadix, as 



in the calla-lily. 

 Spatulate. Applied to leaves and leaf-like organs, which are long and 



narrow, attenuated at the base and rounded at the summit. 

 Spawn. The mycelium of fungi admixed with earth. In this form it 



is usually sold for propagation or cultivation, as. the spawn of Agari- 



cus camptstris (p. 59). 



Spermatozoids. The sperm cells of antheridia (p. 5). 

 Spermoderm. A term commonly employed by German writers to indicate 



the seed coat or the layers developed from the integuments of the 



ovule. These writers frequently use the word testa as equivalent 



to the spermoderm, not distinguishing it from the tegmen. 

 Spicate. Applied to an inflorescence having the flowers arranged in 



spikes, as in the common plantain. 

 Spike. A simple, elongated inflorescence, composed of sessile flowers 



(p. 394). 



Spinose (Spinous). Having hairs that are sharp and pointed (p. 354). 

 Sporophyll. A leaf or leaf-like spore-bearing organ (pp. 104, 120 and 



375). 



Sporophyte. The asexual generation in the Archegoniates (p. 75). 

 Squarrose. Applied to involucral bracts which are rigid, divergent or 



recurved, as in Grindelia squarrosa. 

 Stamen. The sporophyll in the spermophytes that bears the pollen grains 



(pp. 120, 298 and 379). 



Staminode (Staminodium). A sterile or aborted stamen (p. 391). 

 Stele (Central cylinder). The tissues of the primary axis within the 



ehdodermis (p. 312). 



Stereids. A name sometimes applied to stone cells. 

 Stereome. Bast fibers ; applied also to sclerenchymatous fibers which are 



not included in the fibrovascular bundle, as in the leaves of Gaultheria. 

 Stigma. The summit of the pistil which receives the pollen (p. 378). 



