PasiUaejoncetum 



Regeneration 



an association of small species of 

 Carex Linn. 



Pu'sule, add, ~ appara'tus, peculiar 

 vacuoles in the protoplast of cer- 

 tain Peridineae (Schiitt) ; collsct'- 

 ing ~, a small specimen with a 

 duct leading to the flagellar pore 

 {id.); ~ Sack, a large bilobed 

 example in P. Steinii Jorg. (West). 



pycnoxyl'ic {^vXov, wood), the coni- 

 ferous type of wood (Seward) ; 



Cf, MANOXYLIC. 



pyrenomyce'te, relating to Pykeno- 



MYCETES. 



Py'rophobe (ttvp, trvpo?, fire), a 

 plant liable to destruction in forest 

 fires, and incapable of being 

 replaced under the altered con- 

 dition (Gates) ; Py'ropliyte {4>v^6v, 

 a plant), a tree having a thick, 

 fire -resisting bark, thus escaping 

 permanent damage from forest 

 fires {id.). 



Quad'rifid Or'gan, in the bladders of 

 Utricularia Linn,, four long, ter- 

 minal cells arising from a collar- 

 cell at the apex of a pear-shaped 

 cell ; believed to be absorptive 

 (Clarke and Gurney) ; quadri- 

 ciiia'ted (+ ciliate), having four 

 cilia (West); quad'ruple, four sets 

 of chromosomes affected (Blake- 

 slee) ; Quad'ruple Hy.'brids, hybrids 

 which in the first generation split 

 into four types (Atkinson). 



Qua'si-cir'cle (Lat. as though, -f- 

 Circle), Church's term thus 

 defined, the " ovoid curve in a 

 Log-spiral quasi-square mesh " in 

 phyilotaxis. 



Querci'on, an association of Quercus 

 Ilex Linn. 



quint'uple, five sets of chromosomes 

 affected (Blakeslee). 



Rj, Rg, etc., Chauveau's signs for 

 successive root-like organs. 



Batches, suggested in place of 

 RiiACHiDES, as plural of Rhachis 

 (Sahni) ; Ra'chitism, hypertrophy 

 of floral envelopes, especially in 

 grasses and sedges (Touchy). 



Rachil la-flaps, cf. Riiachilla. 



Rad'ical, add, (2) Vanilov's term in 

 place of Lotsy's Linneon, or super- 

 species. 



Rama'lia, pi. (Lat. sticks), " Ramuli 

 to carry out the greater part 

 of metabolic activity " (Church) ; 

 cor'tical ~, near the cortex. 



Ramel'Ius (Mod. Lat.), side branch 

 in algae (Agardh). 



rana'Iian, resembling or akin to 

 Ranales, a group including Ranun- 

 culaceae (Jeffrey). 



ranuncula'ceous, having affinity Avith 

 Ranunculus Linn. ; Ranuncule'tum, 

 an association of aquatic species of 

 Ranunculus, i.e. § Batrachium, DC. 



Ray, add, diffuse' or diverging ~, 

 scattered in the woody tissue ; 

 medul'lary ~ ; (2), limb of a 

 branchlet in Nitella Ag. ; ul'timate 

 '-', = Dactyl. 



Reac'tion, add, ~ Lev'el, bisected 

 by the surface, a few inches above 

 or below (Clements) ; ~ Type 

 (Johannsen) = Phenotype. 



Reeept', an abbreviation for Recep- 

 tacle, as in Euphorbiaceae ; Re- 

 cep'tive Papil'la, cf. Manocyst. 



reces'sive {recessus, a going back), a 

 character which tends to disappear 

 in hybrids : the opposite to domi- 

 nant. 



Reciprocal Hy'brids, add, they are 

 divided into Blend ~, Dou'ble ~, 

 Itera'tive ~, Quad'ruple ~, Selec'- 

 tive ~, Ses'qui- ~. 



Rectigrada'tion {recte, straight ; 

 gradaiio, gradation), adaptive 

 evolutionary tendency from the 

 beginning (Osborn); rectiser'ial, 

 add, (2) the orthostichy spiral when 

 the axis is conical or circular 

 (Church). 



Reduplica'tion, add, (2) used for 

 former expressions Coupling and 

 Repitlsion, i.e. Linkage (Pun- 

 nett). 



Reg, alluvial desert in Algeria. 



Regenera'tion, add, (2) of woodland 

 or forest, its renewal ; of grassland, 

 growth after burning (Tansley 

 and Chipp). 



463 



