268 Ostenfeld. 



generative parthenogenesis); this has hitherto not been found in the 

 phanerogams. 



The definition I gave for apogamy in my paper of 1906 was 

 perhaps rather indistinct; it runs: "that it comprehends all cases 

 where a plant gives seeds, developed from the ovules, without fer- 

 tilization, whether the egg-cell or other cells of the embryo-sac or 

 a cell from the nucellus are the starting point" (1. c, p. 233, foot- 

 note). The last-named case was intended to correspond to the 

 apospory which Rosenberg had then found. Now, I shold prefer 

 to use the following short definition, employing the terminology given 

 by H. Winkler. Apogamy is the apomictic development of 

 a sporophyte from one or several cells of the gametophyte, 

 assuming that the number of chromosomes is unreduced. Thus 

 I include in apogamy both Winkler's apogamy and his somatic 

 parthenogenesis, making no sharp distinction between the apomictic 

 development of the "vegetative egg-cell" and that of the other 

 gametophyte cells, but considering the former case only as a special 

 case of apogamy. 



H. Winkler in his excellent account of parthenogenesis and 

 apogamy in plants ( 1908) has put together all the then known cases 

 of apogamy in its different forms. Since then, several new cases have 

 been found, especially with regard to the phanerogams. In the 

 following I restrict myself to the phanerogams and the considerations 

 expressed apply only to these and among them especially to the 

 dicotyledons, with the apogamy of Hieracium as main point of view. 



A list of the hitherto known cases of apogamy (in my sense) 

 among phanerogams will have the following appearance: 



Monocotyledones. 

 Triuridaceae: Sciaphila nana Bl. (V. A. POULSEN, 1905). 

 Burmanniaceae : Bnrmatinia coelestis Don. (A. Ernst, 1909). 

 Thisiiiia clandesiina Miq. (K. MEYER, 1909). 

 Thistnia javanica J. J. Sm. (A. ERNST and Ch. 

 Bernard. 1909). 



Dicotyledones. 

 Saururaceae: Hoiittuynia javanica Thbg. (Shib.\ta and Miyake, 



1908). 

 Moraceae:[?] Fiais kirta Vahl, and perhaps other species (Treub, 



1902), 



