244 Morphologie, Teratologie, Befruchtung, Cytologie. 



Kusano, S., Furt her S tu dies on Aeginetia indica. (Bull. Coli. 

 Agric. Tokyo Imperial Univ., VIII. 1. 1908.) 



The author describes his studies on the germination as well as 

 on the development of Aeginetia indica, a parasitic plant widely 

 distributed in Japan belonging to the Ovobanchaceae. 



The microscopically small embryo, which shovvs no morpholo- 

 gical differentiation at all, consists merely of epidermal cells and a 

 Single or two central rows of cells, thus resembling nearlj'- that 

 of Orohanche. 



The mode of germination is quite different from that of the latter 

 and is perhaps unique. First of all, without any multiplication of 

 cells, some epidernial cells at the raicropylar end of the embrj^o 

 swell up to nearly four times the original diameter, becoming thus 

 very turgescent and globular, and protrude through the testa. Some 

 of these globular cells then grow out to long hairs, often septate or 

 branched. If their tips come in contact with a host-root, they attach 

 themselves firmly to the latter and then coil up or contract over 

 their whole length, whereby the seedling is drawn close to the host. 

 The author thinks that these hairs are physiologicall)^ similar to the 

 root-tendrils described by Pfeffer, though morphologically quite 

 different. Chiefly on the ground of the above described conduct, 

 the author believes that these hairs possess all the characters of a 

 typical tendril and he proposes the name of "hair-tendril". First, 

 when the hair-tendril comes in contact with the hostplant, the rapid 

 increase of cells begins and the parenchymatous tissue thus derived 

 pushes out, breaking all hair-tendrils, and comes in direct contact 

 .with the hostplant, forming a very conspicuous tubercle upon the 

 latter. The frontal portion of this tubercle penetrates into the cortex 

 of the host-root and forms a primarj^ haustorium. 



The author has experimentally proved that the germination of 

 seeds of Aeginetia indica is due to the chemical Stimulus of substances 

 excreted hy the host-root. In nature, it is found parasitic only on 

 Monocotyledons, but its seeds can germinate b}^ the chemical Sti- 

 mulus, not onl}^ of man}^ Monocotyledons, but also of Pteridophytes 

 and Dicotyledons. Further growth of seedling was however observed 

 only on some Monocotyledons, so that the author concludes that the 

 Stimulus causing the germination and that inducing further growth 

 belong to quite a different category. 



The author has tried also to determine the nature of substances 

 concerned in this Stimulus, but so far he has obtained only negative 

 results. S. Ikeno. 



Linsbauer. K. und E. Abranowiez. Untersuchungen über 

 die Chloroplastenbewegungen. (Sitzungsber. Kais. Ak. Wiss. 

 Wien. math. nat. Kl. CXVIII. Abt. I. Mit 2 Doppeltafeln. 46 pp. 

 1909.) 



Die wichtigeren Ergebnisse lauten : 



1. Die Bewegungen der Chloroplasten von Leinna trisulca und 

 Fnnaria hygronietrica weisen in ihrer Beeinflussung durch verschie- 

 dene Agenzien mehrfache Analogien mit der Plasmaströmung auf: 



ä) Aetherwasser (1%) sistiert die sich beim Uebergang ins Dunkle 

 normalerweise einstellenden Bewegungen, während hierdurch die 

 Annahme der Profilstellung aus der Epistrophe bei direkter Insolation 

 nicht nur nicht gehemmt, sondern sogar beschleunigt wird. In posi- 



