7] Descripth-systematische Botanik. 7 



linder seemed to be that of au origiually paienchymatous Strand oceupying 

 the coutre of the stem in which more cm- less continuous development of con- 

 ducting tissue is differentiated. How the cylinder is to be delimited before 

 the development of vascular tissue is not very clear, since the initial strati- 

 fication described by Hanstein admittedlj^ fails to serve in the light of Dr. 

 Schoute's result for the phanerogames and Mr. Boodles for the ferns. If 

 the mere development of vascular tissue is all that is required to constitute a 

 central cylinder. then the not infreijuent development of vascular Strands in 

 the cortex associated with parenchyma must sureh' militate against the ex- 

 altation of the central cylinder to a rank of eminently different order from 

 the external tissue." 



„In Dr. Jeffreys opinion. a very different view must be taken of the 

 internal parenchyma in angiosperins and the more highly developed ferns." 

 .... „Dr. Jeffrey agrees with most other investigators in regarding as the 

 pi-imitive form of cylinder the solid rod of xylem surrounded by phloem and cut off 

 from the cortex b^' an endodermis. Phloem is then said to appear within the 

 rod of xylem, and after the appearance of a few leaf traces an internal endo- 

 dermis arises, cutting off the internal phloem from a central parenchyma now 

 appearing. This central parenchyma is continuous with the cortex through 

 the leaf-gaps and is regarded as „intruded cortex" — a view diametrically op- 

 posed to that discussed above." .... 



„If the perhaps rather misleading term ,intruded cortex' be replaced 

 by the term .ground parenchyma' or .grouud tissue' we arrive at the concep- 

 tion of a ground-tissue System through which run the vascular Strands. In 

 the most primitive case the vascular System is a solid Strand, in others a 

 hollow cylinder, enclosing ground tissue; in others again it is a network of 

 conducting Strands. This offers a very simple and natural method of regard- 

 ing the vascular System of plants, and entirely obviates the necessity for 

 any abstract distinction between vascular tissue, potential-vascular tissue. and 

 non-vascular tissue which likewise may develop vascular tissue. but which does 

 not belong to the vascular System." 



21. Gilles. Etüde morphologique et anatomique du Sablier 

 [Hura crepitans L.y. (Ann. Inst, colon. Marseille, ann. 13, ser. 2. III. p. 43 

 ä 120, 3 pls. et figs.) 



Nicht gesehen. 



22. Gothan, W. Zur Anatomie lebender und fossiler Gymnosper- 

 menhölzer. (Diss. Berlin 1905.) 



Siehe Jahrgang 1906 des Jahresberichtes. 



23. Günther, Willy. Beiträge zur Anatomie der Myrtifloreu mit 

 besonderer Berücksichtigung der Lythraceae. (Inaug.-Diss., Breslau, 

 1906, 39 pp.) 



Die Ergebnisse der Arbeit werden besprochen im systematisch-morpho- 

 logischen Teüe des Jahresberichts unter „allgemeine Systematik''. F. Fedde. 



24. Gui2;nard. L. Quelques observations sur le Cordyla afrkana. 

 (Journ. de Bot., XIX, 1905, p. 109 — 124, figg. 1—12.) 



Aus den Angaben des Verf.s über die anatomischen Verhältnisse sei 

 folgendes hervorgehoben : 



Stamm: Vom jüngsten Stadium an zeigen die Zweige im Querschnitt 

 gegen die Mitte des Rindenparemchyms hin und in ringförmiger Anordnung 

 15 — 20 Secretkanäle schizogenen Ursprungs, deren zuerst einfacher Saum am 



