240 Chemisches. — Personalnachrichten. 



of the uld World species in which „lobed palisades" have been ob- 

 served; there is no stereome in the leaf, and the midrib is com- 

 posed of one large and two very fine mestome-strands. The stem 

 above ground has no endodermis but a completely closed sheath of 

 stereome which surrounds a Single band of collateral mestome- 

 bundles. In the stolons, on the other hand, there are two distinct 

 steles, each surrounded by an endodermis, besides that an arch- 

 shaped group of stereome Covers the outer face of each stele. The 

 tuberous roots owe their increase in thickness to the development 

 of a secondary cortex and of secondary mestome-strands, besides 

 that the center of the root is occupied by a large parenchyme, a 

 true pith. T. Holm. 



Holm, T., Medicinal plants of North-America: 2. Canlophyl- 

 htm thalictroides (L.) Michx. (Merck's Report. XVI. p. 94—96. 

 f. 1 — 15. April 1907.) 



The internal structure of the vegetative organs shows the fol- 

 lowing points of interest. The roots are storageroots, but some con- 

 tain fungal hyphae in the cortex, hence they may, also, be design- 

 ated as mycorhizae. None of the tissues, however, were found to 

 be hypertrophied by the presence of these hyphae. Increase in 

 thickness was observed to take place in most of the roots, but only 

 to a small extent, and never beyond the formation of secondary 

 leptome and hadrome. A pith was noticed in some roots. but not in 

 others. The very short internodes of the rhizome have no endoder- 

 mis and no sheath of stereome, thus the cortical parenchyma passes 

 insensibly over into the central pith. The mestome-strands (mostly 

 eighteen) are located near the peripher}'-; they are collateral and 

 constitute one circular band. A much firmer structure is exhibited 

 by the long internode of the stem above ground, where a coUen- 

 chyma is developed beneath epidermis, and a closed sheath of 

 stereome inside the cortex; but there is no endodermis. The me- 

 stome-strands (about forty five) are collateral and arranged in one 

 circular band. Very interesting is the fact that the leptome contains 

 Wide secretary ducts, hitherto not known to occur in the Berberi- 

 deae. These ducts are especially frequent in the larger ribs of the 

 leaves. The structure of the petioles is identical with that of the 

 stem. The leaf is dorsiventral, and the stomata lack subsiding cells. 

 There is only one very broad mestome-strand in the midrib, with 

 several very wide ducts in the leptome. T. Holm. 



Personalnaehriehten. 



Dr. E. Fischer, Privatdozent d. Bot. a. d. Univ. Strassburg 

 i. E. erhielt den Titel Professor. 



Dr. H. Kniep habilitierte sich in Freiburg i. B. für Botanik. 



Ernannt: Dr. K. Domin zum Dozenten f. syst. Bot. a. d. k. k. 

 böhmischen Univ. Prag. — Dr. E. Ch. Jeffrey zum Prof. für Pflan- 

 zenpathol. a. d. Harvard Univ. 



Ausgegeben: 3 September 1907. 



Vorlag voa Gustav Fischer iu Jena. 

 Buchdruckerei A. W. Sijthoff in Leiden. 



