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SPO- 



splenium (sple'nium) n. [L. splenium, 

 a patch.] The posterior border of 

 the corpus callosum (anat.). 

 splenius (sple'nius) n. [L. splenium, 

 a patch.] A muscle of the upper 

 dorsal region and back of the neck, 

 in two parts the splenius capitis and 

 splenius colli (ana?.). 



splenophrenic (sple'nofren'ik) a. [Gk. 

 splen, spleen ; phren, midriff.] 

 Pert, spleen and diaphragm (anat.). 



spondyl (spon'dll) n. [Gk. sphondylos, 

 a vertebra.] A vertebra. 



spondylous (spon'dllus) a. [Gk. 

 sphondylos, a vertebra.] Vertebral. 



spondylus (spon'dllus) n. [Gk. sphon- 

 dylos, a vertebra.] A spondyl or 

 vertebra. 



spongicolous (spunjlk'olus) a. [L. 

 spongia, a sponge ; colere, to in- 

 habit.] Living in Sponges (zool.). 



spongin (spun'jm) n. [L. spongia, a 

 sponge.] The material of which 

 the skeletal fibres of a Sponge 

 consist (zool.). 



sponginblast (spun'jfnblast) n. [L. 

 spongia, a sponge ; Gk. blastos, a 

 bud.] A spongin-producing cell 

 (zool.). 



spongioblasts (spun'jioblasts) n. plu. 

 [L. spongia, a sponge ; Gk. blastos, 

 a bud.] Columnar epithelial cells 

 which give rise to the skeletal 

 framework of the spinal cord 

 (emb.). 



spongioplasm (spun'jloplazm) n. [L. 

 spongia, a sponge ; Gk. plasma, 

 something moulded.] The cyto- 

 plasmic threadwork of a cell ; the 

 cytoreticulum (cyt.). 



spongiose (spiin'jios) a. [L. spongia, 

 a sponge.] Of a spongy texture ; 

 spongoid ; full of small cavities. 



spongoblast (spun'joblast) n. [L. 

 spongia, a sponge ; Gk. blastos, a 

 bud.] A sponginblast. 



spongophare (spun'jofar) n. [L. 

 spongia, a sponge ; Gk. pherein, to 

 bear.] The upper chamber-bearing 

 part of a Sponge ; cf. hypophare. 



spongy parenchyma, loosely 

 arranged tissue with abundant in- 

 tercellular spaces on the lower side 

 of a leaf (tot.). 



spontaneous generation, see 

 ablogenesis. 



sporadic (sporad'ik) a. [Gk. spor- 



adikos, scattered.] AppJ. plants 

 confined to limited localities. 

 sporange (sporanj') n. [Gk. sporos, 

 seed ; anggeion, a vessel.] A sac 

 containing spores (biol.). 

 sporangial (sporan'jial) a. [Gk. sporos, 

 seed ; anggeion, a vessel.] Pert, a 

 sporangium (dot.). 



sporangiferous (sporanjlf'grus) a. 

 [Gk. sporos, seed ; anggeion, a 

 vessel; ~L.ferre, to bear.] Sporangia- 

 bearing (&>/.). 



sporangiform (spdran'jiform) a. [Gk. 

 sporos, seed ; anggeion, vessel ; L. 

 forma, shape.] Sporangioid ; like 

 a sporangium. 



sporangiole (sporan'jiol) n. [Gk. 

 sporos, seed ; anggeion, vessel.] A 

 secondary or small few-spored 

 sporangium (bot.). 



sporanglophore (sporan'jiofor) n. 

 [Gk. sporos, seed ; anggeion, vessel ; 

 pherein, to bear.] A stalk-like 

 structure bearing sporangia (bot.). 

 sporangiospore (sporan'jiospor) n. 

 [Gk. sporos, seed ; anggeion, vessel ; 

 sporos.] A sporangium spore (bot.). 

 sporangium (sporan'jium) n. [Gk. 

 sporos, seed ; anggeion, vessel.] A 

 tiny slender-stalked capsule in 

 which spores are produced (bot.). 

 sporation, see sporulation. 

 spore (spor) n. [Gk. sporos, seed.] 

 A highly specialized reproductive 

 cell of plants (bot.) ; a falciform cell 

 of Sporozoa which bores into a 

 mother sperm cell and emerges as 

 an adult (zool.). 



spore case, an elliptical chitinoid 



case containing usually eight spores 



lying round a residual core, a stage 



in the life-history of Monocystis 



(zool.) ; a sporangium (bot.). 



spore formation, reproduction by 



encystation of germ-cells followed 



by division and free-cell liberation ; 



endogenous multiplication ; sporo- 



gony ; sporogenesis (biol.). 



spore mother cells, sixteen cells 



produced by repeated division of an 



archesporium, each in turn dividing 



into four spores (bot.). 



spore sac, a case containing spores; 



a sporangium (bot.). 

 sporetia (spdre'tia) n. plu. [Gk. 

 sporos, seed.] Idiochromidia ; 

 chromidia of generative chromatin. 



