4 Physiologie. 



toplasmas und riss allmählich die Stärke mit. Bei Mimulus ist von 

 vorneherein Protoplasmabewegung vorhanden, doch vermag sie die 

 Statolithenstärke nicht zu bewegen. Nach Umkehrung treten die 

 gleichen Erscheinungen auf. Schliepp. 



Holden, H. S., Some Wound Reactions in Filicinean 

 Petioles. (Ann. of Bot. XXVI. p. 777—793. PL 73-74. 1 Textfig. 

 1912.) 



It is clear from a study of Fern petioles that the extent of the 

 response of these organs to traumatic Stimuli shows considerable 

 Variation. In the more specialised tissues, epidermis, endodermis 

 and vascular elements the response to traumatic Stimuli is less great 

 than in the simpler cortical parenchyma. Moreover different species 

 were modified to a different extent. The petiole, when injured, at- 

 tempts to Protect the wound by the formation in the cortex of a 

 päd of more or less well development cambiform tissue; this may 

 Cover the affected part with meristematic tissue, or, if the response 

 is less perfect the cortical cells at or near the seat of injury merely 

 elongate, or elongate and undergo a certain number of transverse 

 divisions. The less mature the region affected to more marked is 

 the response, the response is relatively weak in the region of the 

 insertion of the pinnae and strongest in the meristematic apical 

 Zone, it is relatively stronger in all parts of the petiole in those 

 forms that produce bulbils, probably because the tissue in these is 

 more adaptable. The cells on the surface of the wound are not as 

 a rule suberized but appear to be protected by the scab-like remains 

 of the injured cells. A production of gum during the further develop- 

 ment of the injured petiole was a common result of wounding. No 

 secondary growth in thickness was found except in an exceptional 

 specimen of Woodwardia orientaüs, where it seemed to be due to 

 bacterial infection. In cases where the result of a traumatic Stimulus 

 is the elongation of the cells near the affected area various stages 

 of pathogenetic, amitotic nuclear division occur. 



Isabel Browne (London). 



Jaccard, P., Baiais de sorcieres chez l'epicea et leur 

 dissemination. (Journ. forestier suisse. p. 87—95. 2 pl. 1911. j 



L'auteur decrit et figure un certain nombre de balais de sorcieres 

 globuleux sur epic^as ainsi qu'un curieux exemplaire d'epic^a com- 

 pletement globuleux decouvert ä Horgen et reste nain (28 cm 

 de hauteur) malgr6 son äge evalue ä 15 ou 20 ans. 



Passant en revue les divers cas connus d'epiceas globuleux, ceux 

 en particulier decrits par Schröter, Moreillon, Hesselman etc. 

 et s'appuyant d'une part sur les resultats des cultures de Tubeuf 

 etablissant le caractere hereditaire des balais de sorcieres de l'epi- 

 cea, d'autre part sur les donnees recentes concernant la rdapparition 

 souvent tres tardive de caracteres latents provenant d'ascendants 

 eloignes, l'auteur cherche ä expliquer la distribution tres sporadique 

 de ces curieuses anomalies. 



La transmission de caracteres latents ä travers plusieurs gene- 

 rations pouvant aussi bien se realiser par les grains de pollen que 

 par les graines, il suffiirait en somme qu'un seul individu anormal 

 produisit du pollen fertile pour que, par l'intermediaire des fleurs 

 femelles d'un individu normal et par suite des graines qui en pro- 



