412 Fr. J. Mathiesen. 



pollen-grains deposited especially upon the lower part of the 

 stigma — the part which is in contact with the anthers 

 (Fig. 16, M). For the rest, the pollen-grains fall out very 

 easily, and it is very common for masses of pollen-grains to 

 be found scattered everywhere in the flower: on the corolla, 

 the filaments, the style, etc. Even if the stigma ripens shortly 

 before the anthers — which I found to be the case in the 

 district of Holsteinsborg — the two organs nevertheless very 

 soon become simultaneously functional and this throughout 

 the greater part of the life of the plant, so that self-polli- 

 nation is possible. That Bartschia, in many places in Green- 

 land, produces ripe fruit, I saw in 1884, from the fragments 

 of such fruit which had remained over from the preceding 

 year." 



According to Kerner (II, p. 301) wind-pollination takes 

 place regularly in Bartschia, in a similar manner as for in- 

 stance in Lathræa, at the end of the flowering period: the 

 style in the older flower withers, the filaments are elongated 

 and carry the anthers outwards, the latter separate and 

 pollen, which may have been left in the anthers is scattered 

 by the agency of the wind, and may pollinate the younger 

 (upper) flowers of the inflorescence. This probably explains 

 the fact mentioned by Lind man that the anthers may pro- 

 ject beyond the edge of the corolla. This author also men- 

 tions the same variations in the length of the style as those 

 of which Warming speaks. 



Also in the material at my disposal there were flowers 

 in which the anthers protruded, and it was generally the 

 lowermost (oldest) flowers of the inflorescence in which this 

 was the case. 



Aug. Schulz differs from Warming in finding that in the 

 Riesengebirge (Bibi. bot. No. 10, 1888, p. 74 — here cited 

 from Knuth) the length of the style, in relation to the corolla. 



