182 



PRINCIPLES OF PLANT-TERATOLOGY. 



Schlechtendal, von. — "Abnorme Bildungen." Loc. cit., 



Jahrg. xiv (1856), pp. 69-74, 731-734. 

 "'Abnorme Pflanzenbildungen." Loc. cit., Jahrg. xv 



(1857), pp. 873-880 [phyllody of bracts]. 

 Schmitz. — "Zur Dentung der Euphorbia-Bliithe/" Flora, 



Jahrg. liv (1871), pp. 417-422, 433-443, pi. iv. 

 Schkoetek. — " Uber die Mutation en der Hirschzunge " 



(Scolopendrium) . Yerli. Sclivveizer. Naturf.-Ges. Luzern, 



88 Jahresvers. (1906), p. 321. 

 Siracusa, Jannelli, G. — " Sopra alciuie interessanti anomalie 



vegetali." Malpighia, Bd. xxi (1907), p. 533. 

 Tammes, T. — " Ein Beitrag zur Kenntniss von Trifolium 



pratense quinquefoUum de Vries." Bot. Zeifc., Jahrg. lxii 



(1904), pp. 211-225. 

 Velenovsky. — " Yergleichende Studien iiber die Salix-Bliiie" 



Beih. Bot. Centrbl., vol. xvii (1904), p. 123. 

 Vetter. — "Lathyrus Aphaca L. var. foliata" Bull. Soc. 



Murithienne Valais, ix (1879), p. 83. 

 Vries, de. — Die Mutationstheorie, vol. i, pp. 570-574. (Tri- 

 folium.) Leipzig, 1901. 

 Species and Varieties : their Origin by Mutation, 



pp. 353-354. London, 1905. 

 Vuillemin. — " Une serie de feuilles d'Orme a ramification 



laterale." Rev. gen. bot., vol. xiv (1902), p. 51. 

 " Sur les causes de l'apparition des formes dites 



anomales." Compt. Bend., vol. cxliii (1906), p. 320. 

 Walpers. — "Eine Monstrositat an den Blattern von Trifolium 



repens." Linnaea, vol. xiv (1840), p. 362 

 Widenmann, A. von. — " Ueber geschlitzte (laciniate) Blatt- 



formen." Jahresber. Yereins vaterl, Naturk. Wiirttem- 



berg, Bd. xlix (1893), Sitzb., pp. 55-60, pi. i. 

 Wigand. — " Beitrage zur Pflanzenteratologie.^ Flora, Jahrg. 



xxxix (1856), pp. 703-719, pi. viii. 

 Wolfe. — Theoria generationis. Halae ad Salam, 1759. 

 Wydler. — " Ueber Verdoppelung der Blattspreite." Flora, 



Jahrg. xxxv (1852), pp. 737-743, pi. ix. 



2. SIMPLIFICATION. 



The phenomena included under tins heading are 

 much rarer than those belonging to the previous 

 section. Many of them must be regarded as progres- 

 sive in nature, others, again, as retrogressive. Under 

 the latter may possibly be included the enations and 

 ascidia of foliage-leaves, and the staminody of foliage- 



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