﻿608 E. Jacobsso n-Stiasny, 



sperm hervor (112, p. 17). »Die Eizelle konnte sich bei aus- 

 bleibender Befruchtung ungewöhnlich vergrößern, ja einmal 

 bestand sogar eine sehr große Wahrscheinlichkeit, daß sich 

 ihr Kern mehrfach zu teilen vermochte, so daß mindestens 

 132 freie Kerne zu zählen waren.... Ist meine Deutung- 

 richtig, so wäre hier eine echte Parthenogenesis vorhanden, 

 allerdings auf einer sehr niedrigen Stufe stehen geblieben« 

 (112, p. 73). Eine ziemlich ausführliche Schilderung der Ver- 

 hältnisse liegt ferner von Cunningham für Fiats Roxbnrghii 

 vor. Über die Entwicklung von Archespor und Makrosporen 

 fehlen hier die Angaben. »The centre of the nucellus is occupied 

 by a huge embryo-sac. . . there do not, as a rule, appear to 

 be any oosphere, synergidae or antipodal cells only in one 

 case I have been able to detect anything which might possibly 

 be taken to represent an oosphere and synergidae, and in 

 that the appearances were doubtful, and such as could only 

 correspond with elements of very abortive character« (22, 

 p. 32). »Within the general mass of nucellar parenchyma. . 

 and immediately around the embryosac, a certain number of 

 small flattened cells... are present. Immediately beneath the 

 apical cap. . . is a large and peculiar cell of this type. . . in 

 close relation to the outer surface of the apex of the embryo- 

 sac (22, p. 32).« »The . . .cell continues to increase more and 

 more in prominence, pressing down, invaginating and apparently 

 ultimately penetrating through the apex of the embryosac, and, 

 at the same time, the peripheral cells shoot out into long 

 horn-like processes. . . a series of three cells arises within 

 the central cell arranged in linear series. . . At a period when 

 the embiyogenic cell already has begun to enlarge, . . . the sac . . . 

 continues, in some cases at all events, to retain its original, 

 Single . . .nucleus. A little later, however, this disappears and 

 is replaced by a large number smaller secondary ones, which 

 are scattered over the inner surface of the wall of the sac 

 and at the same time an increase in the substance of the 

 network of cytoplasm seems to occur« (22, p. 34). Nach 

 dieser Schilderung würden wir es bei dieser Fiats- Art mit 

 ganz ungewöhnlichen Verhältnissen zu tun haben indem der 

 primäre Embryosackkern jede Fähigkeit einer Teilung ver- 



