384 Angfewandte Botanik — Personalnachrichten. 



'■o 



thyrsoid inflorescences, and red drupes clothed with acid-secreting 

 hairs, Rhus glahra L. is recognized as official, and the drug consists 

 of the dried fruit. The drupes have a sour, astringent, not unplea- 

 sant taste, and are often eaten by the country people with impunity, 

 beside that they make a cooling drink infused in water. A streng 

 decoction, or the fluid-extract diluted, affords a very effective gargle 

 in angina, especially in combination with potassium chlorate. The 

 sour taste of the fruit depends upon the presence of malic acid 

 contained in the pubescence which covers the surface. In regards to 

 the other parts of the plant, the bark and the leaves are astringent 

 and are largely used, especially the leaves, in tanning leather, and 

 also in dyeing, For this purpose Rhus glabra is largely cultivated 

 in Virginia, where the annual crop amounts to seven or eight 

 thousand tons, and is coUected between July and the appearance 

 of the fruit. The seedling resembles that of Rh. typhina, described 

 and ligured by Lubbock, but is perfectly glabrous. Characteristic 

 of the root-structure is the development of very wide, resiniferous 

 ducts in the primary as well as the secondary leptome. In regard 

 to the stem ducts are here visible not only in the leptome, but also 

 in the pith; the stele is surrounded by a pericycle of thick-walled 

 stereome, and much libriform occurs in the hadrome. We find in 

 the leaf-blade a typical dorsiventral structure, and the midrib repre- 

 sents a stele being composed of 3 to 4 collateral mestome-strands 

 enclosing a central pith. In contrast to the midrib the lateral veins 

 are not steloid, but contain only one mestome-strand with a duct 

 in the leptome, and surrounded by a thinwalled parenchyma-sheath. 

 Large, Single rhombic as well as aggregated crystals of calcium- 

 oxalate abound in the pneumatic tissue, and in the water-storage- 

 tissue of the midrib. Finally the bright crimson color of the drupes 

 is due to the cell-sap contained in the hairs, which cover the sur- 

 face; these hairs are mostly clavate, seldow fusiform, and consist 

 generally of three cells. Theo Holm. 



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Seit der letzten Publikation sind folgende Arten als Neu-Erwer- 

 bungen zu erwähnen: 



Pseiidornonilia alhotnarginata Saccharotnyces cartüaginosus 



[Geiger. [Frees. 



„ rubescens „ „ niger Lindner. 



„ mesenterica „ „ hominis Busse. 



„ cartilaginosa „ „ pathogen. Curtis. 



Saccharoinyces cartilaginosus ^ „ Binot. 



[Lindner. „ gramdatiis Vuille- 



[min et Legrand. 



iVusseseben : 4 April lOll. 



Verlag von Gustav Fischer in Jena. 

 Buchdruckerei A. W. Sijthoff in Leiden. 



