— 30 



to make out the typical plan. Fig. 5 (p. 3]) shows the diagrams most 

 common. 



The seeds vary much in size and shape, 

 most subterranean seeds however are bigger than 

 those of the terminal panicle. 



Seed is to be found abundantly in autumn 

 beneath the mouldering sheats in old stubbles as 

 well as in new. I never found it germinating in 

 the field, but K. Dorph-Petersen, director of 

 the Danish seed controll station, has been kind 

 enough to test it in the laboratory. For this 

 purpose two small samples of seeds were col- 

 lected from plants growing in the same place, 

 one sample of the common epiterranean seed 

 and one of the subterranean seed. Both sam- 

 ples sprouted rather slowly; in the course of 

 a month about 50 per cent germinated but no 

 difference in rapidity of germination was ob- 

 served between the two samples. From this it 

 becomes certain that the amphicarpous seed is 

 vital as is the common seed. 



At the top end of the fruit between the enve- 



-d lopping bracts I found a dried-up, two-branched 



stigma and one or two emptied anthers, the last 



not more than about 0,1mm. in length. In 1908 



.'b pollen were found in young anthers. 



Danthonia hreviaristata {Danthonia calycina 

 X Sieglingia decumbens) is a hybrid as shown 

 by F. Vierhapper^). 



Of this hybrid I have examined a dried spe- 

 Fig 4. S. decumbens. cimen kept in the botonical museum at Copen- 



n, b, c and d floral ^ ^ 



buds, e secondary in- hagen but matched, identified and labelled by 



spTkS''o7the%iter! Vierhapper himself. It has been collected at 

 raneantype: all were the beginning of the flowering state which makes 

 with lhe^sheats°sTze 2/3, ^^ difficult to see the difference between floral 



buds and vegetative ones in the basal parts of 

 the plant. I examined two buds, situated as in S. decumbens and 

 much alike these. In one of these I found a flower, which had a 

 two-branched stigma and two anthers not quite emptied for pollen. 



j- 



1) Oesterr. hot. Zeitschr. 1903 p. 225. 



