Thallogen 



thermid 



togams; Thallogen {yfyos, race, 

 olftpring), a sTDOuym of Thallo- 

 PHYTE ; tballoid («Woy, resemblance), 

 having the nature or form of a 

 thallus ; applied to Hepaticae in 

 which the vegetative body is not a 

 leafy stem as Marchantia ; thalloi'- 

 dal (Crozier), is a synonym ; Thai'- 

 lome, a thallus-like growth ; cf. 

 Caulome ; Thal'lophyte {(pvrlv, a 

 plant), a plant whose growth is 

 thalloid, no clear distinction of leaf 

 or axis ; Thffll'ostrotfe {ffrpuros, 

 strown), a species migrating by 

 means of offshoots (Clements) ; 

 Thal'lus, pi. Thal'li, (1) a vegetative 

 body without differentiation into 

 stem and leaf; in Fungi the whole 

 of the body which does not serve for 

 reproduction ; (2) Goebel's term for 

 the organ of attachment in Temiola, 

 a genus of Podostomaceae, composed 

 of coalesced dorsiventral branches; 

 '*' Gonid'ia, the gonidia in the thal- 

 lus of a Lichen ; the Lichen thallus 

 is subdivided into <^ lepo'des, cnis- 

 taceous ; -*- pla'codes, foiiaceous ; 

 ^ thamno'des, fruticose. 



Tham'nium X {edfivos. a shrub), the 

 bushy thallus of such Lichens as 

 Cladoniarangi/erina,lloffin. ; tham- 

 noblas'tug i&\a<rrh5, a bud), used by 

 Koerber for a fruticose Lichen. 



Theba'ine (from Thebes, where opium 

 was much employed), one of the 

 crystallized alkaloids occurring in 

 the opium poppy. 



The'ca (^^ktj, a case), (1) the spor- 

 angium of a Fern ; (2) the capsule 

 of a Moss ; (3) X an anther ; (4) X 

 used by Necker for the fruit of 

 Myrtaceae; (5) J "a cell of any 

 sort" (Lindley); (6) = Ascus; 

 (7) used by Vines for the loculus of 

 an anther; (8)" a hollow space in 

 the pericarp formed by the doubling 

 of the enaocarp" (Gray); The'ca- 

 phore (<pof)6a>, I carry), the stipe of 

 a carpel, homologous with the 

 petiole; The'oaspore (<rxopek, a 

 seed) -= Ascospore; Theeaspo'rae 

 (Traverso) = Sporidia; theeaspor'- 

 oni, used of Fungi which have 



the spores in asci (Stonnonth) ; 

 theca'toB, bearing a theca ; the'oial, 

 possessing thecae or pertaining to 

 them; '- Al'gae, the hymenial 

 gonidia of Lichens ; Theeidlon, 

 Tkecid'iumX, = Achene; thecif'- 

 erous (Jero, I bear), bearing thecae 

 or asci ; the'oiger, thed^enis {gero, I 

 bear), theca -bearing, applied to the 

 hymenium of Fungi, and branches 

 of Mosses which bear setae ; 

 The'cium, a layer of tissue below 

 the epithecium, which contains the 

 sporangia in Lichens (Minks), ef. 

 Epithecium, Hypothecitjm. 

 The'in, an alkaloid in the leaves of 



Thea, the tea-plant. 

 The'ke, sometimes used for the theca 



(ascus) of Lichens. 

 thelephor'oid {Thelephorus, cISor, re- 

 semblance), like the genus Thele- 

 phorus. 

 thele'phorus (dr)\h, a ninple; <f>op4v, 

 I carry), covered with nipple-like 

 prominences. 

 thelotre'moid, having tubercular apo- 



thecia like those of Thelotrema. 

 thelyg^enous (fl^Awy, female ; ytvoi^ 

 race, offspring), inducing the female 

 element, as <-' Castra'tion, the pro- 

 duction of pistils in the male-flowers 

 of a host by UstUago. 

 Theobro'mine, the active principle of 

 the cacao-bean, Theohroma Cacao, 

 Linn. ; theobro'minus, the deep 

 chocolate brown of the seed of the 

 same plant. 

 theoret'lo {Btupir^iKUy speculative), 

 pertaining to theory as distinct 

 from practice; -^ Di'agram, a floral 

 diagram of the theoretic compo- 

 nents, not necessarily the same as 

 seen on inspection. 

 Theri'om, or Theri'on (^p, a wild 

 beast), a plant succession due to 

 animal agency (Clements). 

 Ther'mad (e«V?. l^eat, -f ad), a hot 

 spring plant (Clements); ther^mie, 

 warm ; -^ Con'stant, the sun of the 

 mean temperatures of the days of 

 active vegetation, up to some de- 

 finite phase in the plant's life, 

 minus a certain initial temperature 



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