Gyrolith 



Half-terete 



Gy'rolith {yvpos, round ; \i0os, stone), 

 the presumed fossil fruits of Chara ; 

 Gyro'ma, (1) the annulus of Ferns ; 

 (2) the button-like shield of Gyro- 

 phora ; gy'rose, gyro' -us, curved 

 backward and forward in turn ; 

 Gy'rus (Lat., a circle) = Gykoma. 



Hab'it, HaVihLs (Lat., appearance), 

 the general appearance of a plant, 

 whether erect, prostrate, climbing, 

 etc. ; habltally, used in the United 

 States for resembling ; having the 

 habit of another plant. 



Hab'itat, Ilabita'tio (Lat., dwelling), 



(1) the kind of locality in which a 

 plant grows, as woods, moors, etc. ; 



(2) the geographic distribution or 

 limits, now termed Locality, or 

 more precisely Station ; '-- Form, 

 the impress given to the plant by 

 the habitat (Clements) ; '^ Group, 

 applied to those plants M'hich have 

 common habitats, though not re- 

 lated, as Halophytes, Hydro- 

 phytes, and the like ; '-' Ra'ces, 

 used by Magnus for those heter- 

 oecious Uredines, which are adapted 

 to respective species of host 

 (Tubeuf). 



hadrocen'tric (-|- Hadrome ; centrum, 

 the middle), Bun'dle, having the 

 hadrome in the centre surrounded 

 by the leptome (Haberlandt) ; Had'- 

 romal, also termed Had'romase, an 

 enzyme found in Merulius lacry- 

 mans, Schum. , and other Fungi, 

 which attacks the hadrome and 

 destroys its lignified cell -walls 

 (Czapek). 



Had''rome, a shortened form of Hadro- 

 mes'tome {aZphs, thick, ripe, strong ; 

 fiecTTos, filled), the xylem or woody 

 portion of a vascular bundle ; con- 

 sisting of the H YD ROME and part of 

 the Amylome ; together with the 

 Lkptome it forms the Mestome. 



Hae'matein {al/xa, ai/xaros, blood), the 

 colouring matter of Logwood ; hae- 

 mati'nus, haem'atites, haematit'ic, 

 hatmatit'icuH, haematochro'os (xp^s> 

 a tinge), blood-red; Haematochro'me 

 (xp&'Ma, colour), Cohn's term for the 



pigment of ITaematococcut pluvialis, 

 etc. ; Haematox'ylin (^v\ov, wood), 

 the colouring matter of Logwood, 

 Haematoxylon caTnpechianum, Linn. ; 

 Haemorrha'gia {f>ayia, from ^-f^yv/jLai, 

 to break forth), a disease in plants 

 when the sap is constantly exuding 

 through an external wound. 



Hair, an outgrowth of the epidermis, 

 a single elongated cell, or row of 

 cells ; '^ Cyst'oliths, pi. , structures 

 resembling cystoliths occurring in 

 trichomes ; — point'ed, ending in a 

 fine, weak point ; -^ -shaped, fili- 

 form, very slender, as the ultimate 

 divisions of the inflorescence of many 

 grasses ; Hair-breadth = Capillus ; 

 Hair'iness, hirsute, more rigidly 

 hairy than pubescent ; hair'y, pubes- 

 cence when the hairs are separately 

 distinguishable. 



harberd-, or hal'bert-shaped, hastate ; 

 -^ -headed, means the same. 



Half, (1) a moiety ; one part of that 

 which is divided into two equal 

 portions ; (2) sometimes it means 

 one-sided, dimidiate ; '-- - anat'ropous, 

 amphitropous ; '-- Breed, the pro- 

 duct of a cross- fertilization ; '^ 

 -cor'date, heart-shaped on one side, 

 '-' -cylin'dric, applied to a stem 

 flattened on one side ; — equ'itant, 

 partially equitant ; '-' -hu'mus 

 Plants, semi-saprophytes ; -^ -in- 

 fe'rior, used of an ovary when the 

 stamens are perigynous; -^ -mono- 

 pet'alous, the jietals united, but so 

 slightly as to separate easily ; ~ 

 -moon-shaped, semilunate, crescent- 

 like ; ~ -net'ted, when of several 

 layers, only the outer is netted, as 

 the corm of GlaiHuhcs commnnis, 

 Linn. ; — -race^ a form intermediate 

 between a species and a variety of it, 

 I)roducing but few seedlings of the 

 racial character, the majority revert- 

 ing to the specific type ; ~ Sibling 

 (-f Sibling), a ]iair of plants from 

 the ovaries of the same parent, or 

 pollen of the same parent (K. Pear- 

 son) ; '- -stem-clasp'ing. partly am- 

 plexicaul ; --' -supe'rior, the same as 

 half- inferior ; -^ -terete', flat on one 



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