214 



PRINCIPLES OF PLANT-TE KATOLOGY. 



Schlechtendal, F. L. v. — "Pflanzen-Missbildungen." Linnaea, 

 vol. xiii (1839), p. 383 [enations]. 



Tannes,T. — "Die Periodicitat morphologischer Erscheinungen 

 bei den Pflanzen." Yerh. k. Akad. Wetensch., Amster- 

 dam, Sect. 3, Deel ix (1903), no. 5, 148 pp., 1 pi. 



Tepper. — " Remarkable Malformation of Leaves of Beyeria 

 opaca F. v. Muell var. linearis" Journ. Linn. Soc, vol. 

 xx (1883), p. 84. 



Thomas, F. — " Teratologisches von Engstlenalp." Mittheil. 

 bot. Yer. Gesammt-Thiiringen, Bd. iv \_Rhododen droit], 

 1885. 



Treviranus. — " Ueber zwei Pflanzen-Missbildungen." Yerh. 



naturhist. Yer. preuss. Rheinlande und Westphalens, 



Bd. xvi (1859), p. 388 [enations]. 

 " Weitere Bemerknngen iiber monstrose Blatter von 



Aristolochia macrophyJla." Loc.cit., vol. xvii (1860), p. 327. 

 Yuillemin. — " Feuilles peltees et feuilles scyphiees dans le 



genre Geranium." Bull. Soc. bot. Fr., vol. liv (1907), 



p. 577. 



Weisse. — " Ueber Yeranderung der Blattstellung an anfstre- 



benden Axillarzweigen." Ber. deutscli. bot. Ges., Bd. 



xvii (1899), p. 343. 

 " Blattstellungsstudien an Populus tremtda." Festschr. 



f'iir Ascherson, p. 518. Leipzig, 1904. 

 Wilhelm, K. — u Uber einen merkwiirdigen Fichtengipfel." 



Wiesner-Festsclir., p. 528. Wien, 1908. 

 Zederbauer, E. — " Ein sclilauchartiges Blatt von Pinguicula 



alpina." ffisteir. bot. Zeitschr., Jalirg. lv (1905), pp. 



176-178. 



4. CHANGE OF POSITION. — PHYLLOTAXIS. 



This is one of the most important, and at the same 

 time one of the most difficult subjects to deal with. 

 Abnormal cases in seedlings will first be treated of. 



CoTYLEUONS. 



1. Sykcotyly. — It is an exceedingly frequent event, 

 of which De Vries figures many instances in his great 

 w T ork on mutations, for the two cotyledons, in plants 

 belonging to a great variety of natural orders, to 

 become more or less intimately fused to form a single 

 organ : a phenomenon termed by him " Syncotyly.'* 

 De Vries figures such cases in Mercurialis annmis 



