322 GLOSSARY 
selagraph (céas, light), an instrument for recording light values automatically. 
serotinal, late, pertaining to autumn. 
social, used of plants in which the individuals are compactly grouped; ex- 
clusive, excluding individuals of other species; inclusive, permitting the 
entrance of individuals of other species. 
seciety, a subdivision of the formation, characterized by a principal species. 
sparse, scattered singly. 
spermatostrote (omépya, aros, seed), a plant migrating by means of seeds. 
sphyri‘um (o¢¢pov, ankle, talus), a succession in a talus soil. 
spongophyll (oéyyos, a sponge), a leaf consisting of sponge tissue. 
sporadophyti’um (a7opds, dos, scattered), an open formation. 
-spore (o7opd, seed, fruit), combining term for migration contrivance; sporo~ 
strote, a plant migrating by means of spores. 
stability, the condition in which the plant makes little or no response. 
stabilization, the tendency typical of succession, in which the successive 
stages become more stable. 
stasi‘um (o7dois, a standing), a stagnant pool formation; stasad, a plant of 
stagnant water. 
staurophyll (cravpds, a pale), a leaf consisting of palisade tissue. 
sterrhi’um (creppds, barren), a moor formation; sterrhad, a moor plant. 
-strote (orpdros, strewn), combining term for means of migration. 
subcopious, scattered somewhat loosely. 
subgregarious, arranged in loose groups. 
subquadrat, a quadrat of 1-8 decimeters. 
succession, complete and continuous or repeated invasion, in consequence of 
which formations succeed each other. 
symmetry, used of topography when it shows uniform changes; radial, a 
condition in which the different areas are concentric; bilateral, where the 
areas occur in two similar rows. 
syrtidi’um (cvpzis, wd0s, sandbar), a dry sandbar formation; syrtidad, a plant 
of a dry sandbar. 
taphri’um (rddpos, ditch), a ditch formation; taphrad, a ditch plant. 
telmati’um (réAya, aros, water meads), a wet meadow formation; telmatad, 
a wet meadow plant. 
testaceus, pale brick colored. 
thalassi’/um (6dAacoa, sea), a sea formation; thalassad, a sea plant. 
thallostrote (adds, shoot), a species migrating by means of offshoots. 
theri’um (yp, wild animal), a succession due to animals. 
thermi’um (6épuy, hot spring), a hot spring formation; thermad, a hot spring 
plant. 
