11 



him. Thu duvelopment proper of the embryo-sac was 

 completely luft out of account, but the development of 

 the embryo of this pkmt, beginning with the two-celled 

 stage, was treated very thoroughly. It is quite clearfrom 

 his letter-press and from his figures, that the whole deve- 

 lopment takes place In the same way as in the species 

 examined by myself. The same can be said of the other 

 cases, in which he has stated or figured something regarding 

 tho ovules of Podostemaceae namely Castelnavia princeps 

 Tul et Wedd.') Eydrohryum olivaceum Gardn. ^j and 

 Tristicha hypnoides S p r e n g ^). On the last named C a r i o ^) 

 had already made observations which seemed to indicate 

 an agreement with the other Podostemaceae as regards 

 the development of the ovule. This is of some little im- 

 portance, because this plant déviâtes in the structure of 

 its flowors from the majority of the species of the order. 

 If the development of the ovule hère corresponds to what 

 I found in the species examined by me this agreement 

 constitutes an additional reason for supposing, that the 

 order is extremely uniform in its embryogeny, in which 

 it differs so widely from the other Angiosperms. I hâve 

 already remarked, that much to my regret, I hâve only 

 ripe seeds of Tristicha, but no younger stages. In the 78"' 

 Versammlung Deutscher Naturforscher und Aerzte in 1900 

 at Stuttgart E. von Wettstein made a comm unication : 

 „Ueber Entwickelung der Samenanlagen und Befruchtung 

 der Podostemonaceen". So far he has not published anything 



1) Warming, 1. c. Plate XIV. Fig. 9—21. 



2) W a a m i û g, Ibid. 6 Raekke, Nat. og math. Afd. VII. 4; 

 1801, p. 37, fig. 34. 



3) Warming, Ibid. 6 Raekke, Nat. og math. Afd. IX. 2. 

 1899. p. 113, fig. 6. 



4) R. C a r i o. Anatomisclie Untersuchung von Tristicha hypnoides 

 Spreng Botan. Zeitung. 1881 S. 73, Taf. I. Fig. 20—24. 



