344 Varietäten, Descendenz, Hybriden. — Physiologie. 



Wheldale, M., Die Vererbung der Blütenfarbe bei Antirrhi- 



num majus. (Ztschr. für ind. Abst. und Vererb.lehre. III. p. 311 — 333. 



1910.) 



Verf. hat gleichzeitig mit Baur Versuche über die Vererbung 



der Blütenfarbe bei Antirrhinum majus gemacht. In vorliegender 



Arbeit wird ein Vergleich gemacht zwischen Wheldale's und 



Baur's Resultaten betreffs der Blütenfarbe und es zeigt sich dass 



die Ergebnisse übereinstimmen. W. A. Goddijn (Leiden). 



Dalf, E. M., Transpiration and Behaviour of Stomata in 

 Halophytes. (Ann. Bot. XXV. 98. p. 485-505. 13 figs. 1911.) 



The experiments have reference to the different views as regards 

 succulence of halophytes. Seh im per regarded these plants as 

 essentially xerophilous, Stahl saw in the sueculent habit a cora- 

 pensation to reduce transpiration no longer regulated because the 

 stomata cannot close, while Rosenberg obtained the result that 

 the stomata have the power to close. In this paper loss of water 

 due to transpiration is estimated by measuring the total transpiring 

 surface and observing loss of weight during withering. In the case 

 of such leaves as Sueda and Salicornia, details are given for mea- 

 suring area of transpiring surface by tracings and by coating leaves 

 or shoots with celluloidin which forms a film that can be removed 

 and measured; figures and curves show that results can be obtai- 

 ned with a relatively small error. These lead to the conclusion that 

 typical halophytes (Salicornia annaa and Sueda maritima) have a 

 high rate of transpiration which is comparable with, or even greater 

 than, that of a typical mesophyte such as Vicia faba. The absorption 

 of water by green parts of halophytes when compared with that of 

 mesophytes shows that when not turgid these plants are able to 

 absorb water freely over their whole surface, and that in this 

 respect they resemble certain mesophytes (Rumex sp. and Plantago 

 lanceolata), they have also a certain capacity for storing water. 



The observations on the stomata of halophytes are given as 

 preliminary. Statistics are given as to distribution and number 

 p. sq. cm., and by direct Observation the stomata were seen to close, 

 even on young shoots of Salicornia annua where the stomata had 

 not attaine d their füll size. The stomata of Salicornia and Aster 

 tripolium are not sunken nor protected by cuticle to any extent, 

 but rather resemble those of a typical mesophyte in being superfi- 

 cially placed, capable of opening and closing, and sensitive to light 

 and changes in humidity of the atmosphere. The stomata of Sali- 

 cornia appear to lose power of movement after the flowering period 

 and remain permanently closed. Those of Aster tripolium were 

 observed to be open in air nearly saturated with water vapour, but 

 closed in air with 75 p.cent. relative humidity; in winter this power 

 of movement diminishes. The stomata of Sueda maritima and Atri- 

 plex portulacoides have never been observed open. In the case of 

 Sedum acre and 5. album, the stomata are unprotected' and meso- 

 phytic in character, and the plants show a high rate of transpiration 

 per unit area. W. G. Smith. 



Halket, A. C, Some Experiments on Absorption by the 

 aerial parts of certain Salt- Marsh Plants. (New Phytol. 

 X. p. 121-139. 1911.) 

 After reviewing published work in the same direction, experi. 



