GLOSSARY 525 



Synergids (Syn-er'-gids), the two sterile cells in the micropylar end of the 



embryo sac, 201, 412-414. 

 Synsepalous, sepals united, 408. 

 Synthetic, the character or property of synthesis, a coming together of the 



elements forming a substance or compound, 113. 



Teleutosorus (Te-leu-to-so'-rus) , a pustule bearing teleutospores, 314. 

 Teleutospore (Te-leu'-to-spore), the spore formed in the final stage in the 



life history of the rusts, large numbers usually formed in a sorus, 



311-320. 



Tetramerous (Te-tram'-er-ous), said of flowers with their parts in four's, 407. 

 Tetraspore (Tet'-ra-spore) , name of the spores in the red algae which are 



developed in groups of four, 354. 

 Thallophyta (Thal-loph'-y-ta), or Thal'-lo-phytes, branch of the Plant 



Kingdom including the algae, fungi, bacteria, etc., 225, 228. 

 Thallose, having a true thallus, 336, 359. 

 Thallus, a plant body not having true stems, roots and leaves, which may 



or does bear the sexual organs. Characteristic of the plant body of 



the algae and fungi (the Thallophyta) and of the gametophyte of 



liverworts, mosses, ferns, etc., though sometimes restricted to the 



cellular expansions not differentiated into stems and leaf-like parts, 



231, 245, 272, 279, 334, 335, 343, 345. 

 Thyrsus, a panicle of a compact pyramidal form, as in the lilac, horse 



chestnut, etc., 149, 153. 

 Toxic, poisonous. 

 Toxin, a ptomaine poison produced by the action of bacteria in disease or 



in putrefaction, 269. 

 Trichogyne (Trich'-o-gyne) , a hair-like organ terminating the egg case or 



female sexual cell of certain algae or fungi whose function is to receive 



the sperm, 245, 261, 262. 



Trimerous (Trim'-er-ous) , said of flowers with their parts in three's, 407. 

 Tropophytes (Trop'-o-phytes)*, plants which live as mesophytes during the 



growing season, and as xerophytes during the winter or resting season, 



459- 



Tundra, a more or less treeless vegetation area in Arctic regions, 480. 

 Umbel, a flower cluster with the main flower shoot short, with the long 



flower stems arising around this axis at nearly the same level, 149, 150, 



153- 



Uredosorus (U-re-do-so'-rus), a pustule bearing uredospores, 312. 

 Uredospore (U-re'-do-spore) , applied to spores borne in pustules and 



forming the propagative stage (red rust stage) of certain rust fungi, 



311, 313, 315, 319. 



Vacuole (Vac'-u-ole), a clear space in protoplasm filled with "cell sap," 234. 

 Venter, the basal, enlarged part of the archegonium, 338, 340. 



