Bd. XCIX. No. 13. XXVL Jahr.gang. 



Botanisches Ceiitralblatt. 



Referirendes Organ 



der 



Association iiiteriicatioiiale des Botanistas 



für das Gesammtgebiet der Botanik. 



Herausgegeben unter der Leitung 

 des Präsidenten: des Vice-Präsidenten: des Secretärs : 



Prof. Dr. R. v. Wettstein. Prof. Dr. Ch. Fiahault. Dr. J. P. Lotsy. 



und des Redactions-Commissions-Mitglieds : 



Prof. Dr. Wm. Trelease. 



von zahlreichen Specialredacteuren in den verschiedenen Ländern. 

 Dr. J. P. Lotsy, Chefredacteur. 



»j ^Q I Abonnement für das halbe Jahr 14 Mark lOHC 



durch alle Buchhandlungen und Postanstalten. 



Alle für die Redaction bestimmten Sendungen sind zu richten an Herrn 

 Dr. J. P. LOTSY, Chefredacteur, Leiden (Holland), Rijn-en Schiekade 113. 



Penhallow, D. P., The anatomical c hang es in the 

 structure of the vascular cylinder incident to 

 the Hybridization of Catalpa. (American Naturalist. 

 XXXIX. March 1905. p. 113—136. fig. 1-8.) 



From an anatomical comparison of the wood of Teas' 

 hybrid Catalpa, with that found in the species C kaempferi, 

 C. speciusa and C. bigiwnioides, the author reaches the con- 

 ckision that C. speciosa is not in any way concerned in the 

 production of Teas' hybrid and that the hybrid is a result of 

 the crossing of C kaempferi and C. bignoiiioides, with a deci- 

 ded dominance of the Japanese parent. This conciusion 

 agrees with that which has been reached by Professor Sargent 

 from the study of external characters. E. C. Jeffrey. 



Shoemaker, D. N., n the d e v e 1 o p m e n t o f Hamamelis 

 Virginia na. (Botanical Gazette. XXXIX. April 1905. p. 248 

 —264.) 



The anthers are biloculamental from the first, the micro- 

 spore when artificially germinated produces a pollen tube with 

 plugs of callus, a feature not observed in connection with 

 normal growth. Only one of several macrospores, which appear 

 in the ovule is functional^ the germinating macrospore is 

 nourished by a Strand of tissue from the chalaza. Fertilization 

 takes place in May, months after pollination. The embryo 

 grows slowly and the germination of the seed takes place 

 generally only after two years. E. C. Jeffrey. 



Botan. Centralbl. Bd. XCIX. 1905, 21 



