352 Agricultur. — Necrologie. Nachtrag. 



upon four oi the largest plantations in this region Some oi the more 

 important points which have been brought out by these studies were the 

 following: The catalp reaches its best growth upon very rieh soil. It 

 should be protected by shelter belts of taller trees to prevent the defo- 

 liation of the trees by hard winds, which in some places is a very 

 serious evil. The trees should be planted very closely together to cause 

 seli pruning and force a straighter growth. Cutting back will often cause 

 much straighter growth to be produced than iirst. 



Part, li, by Dr. vonSchrenk, treats of the diseases of the catalpa. 

 The wood is very durable and is remarkably free frorn fungus attacks 



Polyporus versicolor (L.) Fr. destroys the heartwood very rapidly 

 after it once gets entrance. It gains entrance by means of old rotten 

 branches which break off in such a manner as to leave a hole into the 

 tree trunk. The sporophores were found oniy on live trees. We have 

 here a close adaptation of the fungus, which usually grows only upon 

 dead wood, i. e., wood cut or broken from the tree, while here it grows only 

 on the wood of the living tree. The fungus which destroys the wood 

 of the living tree stops its growth when the tree is cut. The 

 heart wood is changed into a pulpy soft, spongy mass, which is readily 

 broken, does not crumble into a powder, and retains the semblance of 

 wood fibres. It is of a straw yellow color. 



A second form of decay turns the wood to a brown color. St is 

 tough, very brittle, and füll of cracks. This decay is always found near 

 the'ground. The rotten wood crumbles to a fine powder. The fruiting 

 bodies resemble Polyporus (Poria) vaporarius but does not seem to be 

 the same. It is named Polyporus (Poria) catalpae n sp. 



P. Spaulding. 



ANONYM, L. J. Celakovskv. (Oesterreichische botanische 

 Zeitschrift. Jahrgang LW. * Wien 1903. p. 52—58. Mit 

 1 Portrait.) 



Eine kurze Biographie. Dafür aber eine umso trefflichere 

 Schilderung der Verdienste des Verstorbenen um die ver- 

 gleichende phylogenetische Morphologie und um die Floristik 

 Böhmens, deren bedeutendster Vertreter Ceiakovsky war. 



Matouschek (Reichenberg). 



HALACSY, EUGEN VON, Theodor von Heldreich, ein 

 Nachruf. (Magyar botanikai iapok. Ungarische botanische 

 Blätter. Jahrg. I. Budapest 1902. No!" 11. p. 325—336. 

 Mit 1 Bildnisse.) In deutscher Sprache. 



Leben und Wirken des für die griechische Flora so verdienstvollen 

 Mannes mit einem vollständigen Verzeichnisse der von Heldreich ver- 

 öffentlichten Abhandlungen. Matouschek (Reichenberg). 



achtrag. 



Als Mitglieder sind der Gesellschaft beigetreten: 



Mr. L. Newton Brain, Mycologist to the Imperial Department for the West- 



Indies, Barbados. 

 Fr. Keeble, Lecturer in Botany in University College Reading (England). 

 W. W. Schipper, Gymnasiallehrer, Winschoten (Niederlande). 

 Societe Linneenne de Bordeaux ä Bordeaux (France). 



Ausgegeben: 14. April 1903. 



Commissions-Verlag: E. J. Brill in Leiden (Holland). 

 Druck von Gebrüder Gott helft, Kgl. Hofbuchdrucker in Cassel. 



