Tuberiditim 



Volutin 



pseudo-bulb of an orchid (Reichen- 

 bach) ; tuber'iform {forma, shape), 

 tuber-like. 



Tu'mor-strands, conveying infection 

 into healthy tissue and inducing 

 the growth of galls. 



Tur'gor Pres'sure, the pressure uf 

 protoplasm on the cell- wall (Salis- 

 bury). 



Tur'io, Tur'ion, add, (2) used by Mrs. 

 Arber for winter-buds, such as 

 those of Hydrocharis Linn. 



Turn'ing Cells, three small cells at 

 the base of the oogonium of Nitella, 

 derived from one at the base of 

 the oosphere. 



ty'phaceous, akin to or resembling 

 Typha Tourn. 



Ty'ponym {ovo^xa, a name), an older 

 name than the current one, based 

 on the same type (U.S. rule). 



-ule, for SociES, as Sedule, Silenule, 

 etc. (Clements). 



Ulice'tum, an association of TJlex 

 Linn. 



ulna'ceous, pertaining to Ulna Linn. 



altra-microscop'io (a/coTre'cu, I see), 

 beyond visibility by modern micro- 

 scopic means. 



nm'belloid, somewhat umbellate. 



ondec'uple, eleven sets of chromo- 

 somes (Blakeslee). 



onifa'cial, reduction to one surface 

 from bifacial ; ** suppression of 

 adaxial surface " (Adamson) ; 

 u'ni-indu'siate, having only one 

 indusium, as Cheilanihes Sw. 

 (Bower) ; unilat'eral, add, (2) 

 ^ Segrega'tion, when confined to 

 one sex (Bateson) ; unimo'dal, con- 

 fined to one shape or make (Engle- 

 dow) ; Unimodarity, the state in 

 question ; uni'strate (stratum, a 

 layer), Avhen leaf-indumentum is 

 of one kind and persistent (Balfour). 



Urcaurome (Ur, Germ. = first, -f 

 Caitlgme), the primitive stem 

 (Potoni6). 



urti'cal, urticaceous. 



Vaccine'tum, Vaccinie'tum, an asso- 

 ciation of Vaccinium Linn. 

 Vac'uome, composed of metachromatic 



corpuscles in vacuoles of Selagi- 

 nella Spring (Dangeard). 



Vag'in, a brown colouring substance 

 in certain ferns, *' a form of phle- 

 botannin " (Baseke) ; Vag'in ule, 

 the withered basal portion of an 

 archegonium enclosing the base 

 of the sporogonium (Worsdell). 



Varia'tion, add, anarogous — or 

 par'allel ~, similar variations in 

 allied species ; homorogous ~, in 

 distinct species from a morpholo- 

 gical point of view, colour, shape, 

 etc. (Vavilow). 



Varie'tum, an association of various 

 species of Festuca Linn. 



Vegeta'tion Forms, usually divided as 

 monocarpic and polycarpic (Warm- 

 ing), or woody plants, perennial and 

 annual herbs. 



velam'inous, used of roots possessing 

 velamen (Moss). 



Veld (Dutch), used for all native 

 vegetation from rich forest on 

 the south-east coast of South 

 Africa to desert in interior Karroo 

 (Pole Evans). 



Ven'tral Plate, cover of the ventral 

 area in Peridineae (Kofoid). 



vexil'lar (Worsdell), vexillary. 



Vicar'ial Species, applied to elemen- 

 tary or micro- species (Turesson). 



Vid'uae, pi. (viduus, bereft), used 

 by Crantz for unisexual plants or 

 flowers. 



Vina'cea, pi. (Lat.), grape stones. 



vi'oletform, Greene's expression for 

 violaceous. 



Viride'tum, an association of Alnus 

 viridis DC. 



Vi'tamines, accessory food-factors in 

 plants, of catalytic nature ; also 

 termed food-hormones, sitacoids, 

 vitellites, advitants ; A is fat- 

 soluble, in green leaves ; B, water- 

 soluble, abundant in legumes ; C, 

 anti-scorbutic ; the others, D and 

 E, are but little known as yet. 



vixgregar'ious, Clements's term for 

 sparse vegetation. 



volvo'cean, belonging to Volvox 

 (Janet). 



Volu'tin, a reserve material in grains 

 for the nucleo-proteids of the 



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