75] yillgemeine Systematik. 3|3 



a dichotomous manner and a detailed description of the leaf of each species 

 is given, whilst numerous figures help to illustrate the special points. The 

 book contains a great deal of useful information and the general part is 

 written in a easily comprehensible style." 



461. Worsdell, W. ('. The principles of morphology. I— II. (New 

 Phytol.. IV, 1906, p. 124—133, 163—170.) 



Nach einer Einleitung behandelt Verf. zunächst die Fragen des 

 Generationswechsels und des Ursprungs der Sporophyten. Er gibt seiner 

 Auffassung in folgendem Schlusssatz Ausdruck: „The three morphological 

 categories of organs, viz., the leaf stem and root, which have persisted and 

 remained distinct each frora the other ever since the antiphytic generation 

 attained any development find their natural origin, therefore, in the capsule,^ 

 seta and foot or sucker respectivelj of the primitive Bryophjtic sporogonium. 

 They have become more and more distinct from each other over since." 



Im 2. Teil bespricht Verf. die Evolution des Sporangiums. Hier lautet 

 sein Resümee wie folgt: „It is obvions from all that nos been said above, 

 the the Sporogonium of the primitive Bryophyte is at once the homologue: 

 I. of every type of foliar organ: 2. of every type of sporangiophore ; 3. of 

 every type of sporangium whether eu- or leptosporangium, no matter in what 

 group of plants it may occiir; 4. of the entire sporophyte. This is tlie doctrine 

 of variously-graded homologics. The deductions from this idea are appa- 

 rently, but only apparently, absurd; thus: the sporogonium of a Eryophyle 

 nust for instance, be rigidly homologous both with a oak-tree and with eveiy 

 Single nucellus contained by every ovule of that oak-tree. 



The idea may be yraphically represented thus: 



sporophyte 



eusporanguim 



ovule 



sporogonium 



i \ 



leaf i leaflet 



I 

 leptosporangium 



Siehe J. M. Ühamberlaiu in Bot. Gaz., XL (1905), p. 392. 



C. K. Schneider. 



462. York, Harlan H. The Hibernacula of tlie Ohio water plants, 

 (Ohio Nat., V, 1905, p. 291—293, Fig. 1—3.) 



Abgebildet werden Hibernacula von Ufricularia vulgaris. Verf. zählt 

 auch andere Genera auf, die Winterknospen entwickeln, deren Charakter er kurz, 

 skizziert. C. K. Schneider. 



XII. Allgemeine Systematik. 



463. Boniiier, (iastoii. Remarques sur la comparaison entre le» 

 Angiospermes et les Gymnospermes. (Rev. gen. Bot., XVII [1905], 

 p. 97 — 108, avec 6 figures dans le texte.) 



In bezug auf den Hauptunterschied zwischen Gymnospermen und Angio- 

 spermen kommt Bonnier zu folgendem Resultat: 



