6 Dansk Botanisk Arkiv, Bd. 2 Nr. 10. 



about upon the flowers, they catch hold with extended claws and 

 thus clutch the fissure of the anthers. When the insects next remove 

 the foot, while keeping hold of the fissure of the anthers, the pul- 

 villus is passed through the fissure of the anthers up into the corpus- 

 culum, and gets the latter fixed upon it (Robertson, Zander and 

 others). The corpusculum with the pollen-masses having been ex- 

 tracted, the appendages turn, so that the pollen-masses, during 

 the moving about of the insects upon the flowers, constantly turn 

 the edge, in which the chink of the pollen-mass is formed, towards 

 the fissure of the anthers (Hildebrandt), by which means the 

 pollen-mass is placed with the chink-forming edge in towards the 

 stigma (Rob. Brown). It is the pollen-mass alone, which is pulled 

 up into the fissure of the anthers (Robertson); we must, however, 

 add that the whole of the pollen-mass apparatus also may be pulled 

 up into the fissure of the anthers, which explains that the corpus- 

 cula may sometimes be found fixed inside the fissure of the anthers 

 towards the stigma. After that the pollen-masses have been torn 

 off, the remnants of the appendages fixed upon the corpuscula will 

 act, as the pulvillus did before, by which means the insect may 

 happen to become encumbered with the curious dichotomous com- 

 bination of corpuscula (Hildebrandt). 



Literature. 



1. F. Hildebrandt: Ueber die Befruchtung von Asclepias comuti. Bot. 

 Zeit. 1866. 



2. H. Müller: Die Befruchtung der Blumen durch Insekten. Leipzig 1872. 



3. Corry: On the Structure and Development of the Gynostegium etc. 

 — Trans. Linn. Soc. 2 ser. vol. 2. 1881—87 Bot. 



4. Robertson: Notes on the mode of Pollination of Asclepiadeæ. Bot. 

 Gaz. XI, 1886. 



5. Rob. Brown: On the Organs and mode of Fecundation in Orchideæ 

 and Asclepiadeæ. — Trans. Linn. Soc. XVI, 1833. 



