GLOSSARY. 857 



Teira (as a prefix) : four. 



Telradynamous : having six stamens, two of which are shorter than 



the others. 

 Tetrgsporea : non-sexual spores ; as of the Floride« ; mostly in fours. 

 Thalamus : the receptacleof a flower. 

 Thallophyte : a Cryptogamous plant which has no differentiation of 



stem and leaves. 

 Thnllus : a cellular expansion without differentiation into caulome 



and phyllome. 

 Theca : the sporangium or spore-case ; as in MosSes. 

 Throat : the opening in a Gamopetalous corolla. 

 Tissue : any union of cells. 

 Tomentose: with woolly hairs. 

 Torus: the upper end of the peduncle which supports the floral 



organs. 

 Tracheary tissue : ducts or vessels with thickened and variously 



perforated walls. 

 Tracheides : cells with markings similar to the ducts. 

 Transpiration: same as exhalation or evaporation. 

 Tri (as a prefix) : three or thrice. 



Triadetphous : the stamens united by their filaments into three sets. 

 Tribe : a group under an order or family. 

 Trichogyne: the filamentous prolongation of the carpogonium in 



some Cryptogams. 

 Trichome : a hair. 



Trifoliate : a compound leaf with three leaflets. 

 Triple-veined : with a large vein on each side of and approximately 



parallel with the midrib. 

 Tristdeale: three-grooved. 

 Truncate : as if cut square off. 

 Tuber : an enlarged portion of a subterranean stem. 

 Timicate: coated. 



Umbd : a flower-cluster in which the pedicels have a common point 

 of insertion. 



Umbellate : in or like umbels. 



Umbelliferous : bearing umbels. 



Undulate: wavy. 



Under-shrub : a very low shrub. 



Unguiculaie : having a claw. 



Uni (as a prefix) : one. 



Unsyrmnetricai flower : one in which the number of parts in each set 

 is dissimilar. 



Uredospore: a thin-walled "summer" spore of the Uredo stage, 

 formerly considered as a distinct genus ; as in the Uredinese. 



Utricle : a seed like an acheniuui, but with a loose or inflated peri- 

 carp. 



Vaeuole : the cavity in the protoplasm of the cell filled with a 

 watery fluid. 



Valvate : having valves ; (in sectivation) edges meeting without over- 

 lapping. 



