()\2 Anatomie. 



g., Javaniciis-g., Hybridus-g., Robinsü-g., Zosterifolius-g , Pectinatus-g... 

 Pusillus-g. and Confervoides-gr oup. 



The number of species mentioncd is 53; but not all 

 are anatomically examined and consequently some of the groups. 

 may be provisional ones. 



With regard to the evohition-direction of the Single charac- 

 ters (which Variation of a Single character is to be looked upon 

 as the primary one?), the author remarks as foUows: K It 

 seems most probable, that the existence of bundles in the bark 

 is the primary stage from which the evolution has spread into 

 two directions of which one has led to a reduction to but one 

 ring of SLibepidermal bast-bundles, while the other led to the 

 entire loss of bark-bundles. 2. Forms with isolated bundles in^ 

 the axial cylinder are looked upon as representing the older 

 type while those with united bundles are held to be younger. 

 3. In general, leaves provided with a sheath and ligula have to 

 be considered as to be primitive while the sheathless ones, 

 with a free axillary ligula must be looked upon as derivations 

 from the former, there is however some uncertainty if one tries-. 

 to apply this principle to the single species. 4. The questiorr 

 of the shape of the leaf is not so easy; but the author thinks 

 that the thin, broad submerged leaf is primary, while the floating 

 leaf; the thin, linear submerged leaf and the thick, linear sub- 

 merged leaf are derived from the former. 



Lastly Mr. Raunkiaer shows how easily one may ana- 

 tomically settle the vexed question : „what is Potamogeton 

 fliiitaus Roth? It becomes at once clear that P. fluitans 

 auct. comprises two quite different forms, viz. 1. a barren form 

 which has numerous bark-bundles in the stem, C-endodermis. 

 and oblong axial cylinder with c. 8 vascular bundles more or 

 less touching each other; 2. a fruiting form (the Neckar-plant) 

 which has no bark-bundles, 0-endodermis and more rounded 

 axial cylinder with c. 8 always quite separated vascular bundles. 

 The first of the two forms is a hybrid between P. liicens and 

 P. natans, the other is an independent species belonging to 

 the Polygo/ii/olliis-gvoup. The author has examined 3 speci- 

 mens from the P et er sb u rg-h er ba r i u m which probably 

 are original specimens ot Roth, alle these belong to the 

 Neckar-plant; consequently the name oi P. // uif ans Roth shoulö. 

 be kept for this form and not for the hybrid. The last can 

 not Claim an independent name being no species. 



The treatise is illustrated with 9 groups of anatomical 

 figures in the text. C. H. Ostenfeld. 



Schmied, H., U e b e r C a r o t i n i n d e n W u r z e 1 n v o n Dracaena 

 und anderer Liliacecn. (Kleinere Arbeiten des pflanzen- 

 physiologischen Instituts der Wiener Universität. Oester- 

 reichische botanische Zeitschrift. 1903. No. 8.) 



Verf. beobachtete eine lebhafte hell- bis orangegelbe Färbung 

 der Wurzeln einiger Liliaceen, welche den Gattungen Dracaenay. 



