Diploe 



OF BOTANICAL TERMS. 



Disk Flower 



cluster each forming a cell- 

 wall. After some hours of 

 rest the protoplasm of each 

 spore escapes from its cell-wall, 

 acquires cilia, and enters upon 

 a period of active movement. 



DLP'LOE, see Mesophyll. 



DLPLOGEN'ESlS, the duplication 

 of parts normally single. 



DIPLOPERiS'TOMOUS, said of the 

 capsule in mosses when the 

 peristome consists of a double 

 row of teeth. Compare Aplo- 

 peristomous. 



DIPLOSTEM'ONOUS, having the 

 stamens in two whorls, those 

 of each whorl equal in number 

 to the petals, which are in one 

 whorl. Compare Isostemo- 



NOUS. 



DIPLOTE'GIUM (pi. Dlplote'gia), 

 an inferior capsule, as in Cam- 

 panula. 



DlP'TEROUS, two-winged. 



DiREC'TION-CELLS, see Polar 

 Cells. 



DIRECTION-CdR'PUSCLES, see 

 Polar Cells. 



DIRECT' METAMdR'PHOSIS, see 

 Progressive Metamorpho- 

 sis. 



DIRECT' SUPERPOSITION, the 

 situation of accessory buds in 

 an axil above the leading bud 

 or one first formed, as is usu- 

 ally the case in superposition. 

 Compare Inverted Superpo- 

 sition. 



DIREMP'TION, see Displace- 

 ment. 



DISARTICULATE, to separate at 

 an articulation or joint, as 

 most leaves in autumn. 



DlSC, see Disk . 



DiS'CIFdRM, disk-shaped; flat 

 and circular. 



DlSCIGEROUS, disk-bearing, as 

 the woody tissue of conifers. 



DlS'COCARP, an ascocarp in 

 which the hymenium lies ex- 

 posed while the asci are matur- 

 ing, as in Peziza. The term 

 has also been applied to fruits 

 like the rose aud fig, in which 

 the receptacle is expanded and 

 forms the main part of the 

 fruit, enclosing the seeds or 

 achenia. 



DISCOID, disk-shaped; flat and 

 circular; belonging to the disk, 

 as the central florets in a head 

 of Compositae. 



DISCOID FLOWER, a head of 

 flowers in Compositae in which 

 each flower is tubular. 



DISCOID MARK'ING, see Bor- 

 dered Pit. 



D!SC0L'6R, of more than one 

 color; variegated; especially 

 having the two surfaces of a 

 leaf differing in color, as in the 

 begonias. Compare Unicolor 

 and Concolor. 



DlS'COUS, disk-shaped. 



DISCRETE', distinct; separate. 

 Compare Concrete. 



DfS'CUS, see Disk. 



DISEP'ALOUS, of two sepals. 



DISK, any flat, circular area: the 

 central part of such an area or 

 of any flat body as opposed to 

 the border; disc. Especially 

 (1) the central part of a head 

 of flowers in Compositae, gen- 

 erally bearing tubular florets 

 only; (2) the portion of the 

 receptacle of a flower between 

 the stamens and pistil, often 

 more or less dilated and serv- 

 ing as a nectary; (3) a circular 

 bordered pit, as in Coniferae; 

 (4) the circular adhesive base 

 (retinaculum) of a pollinium. 



DISK FLO'RET, see Tubular 

 Floret. 



DlSK' FLOWER, see Tubular 

 Floret. 



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