367 



Fig. 2 (Vi). 

 V. tricolor maritima 

 from Læsø : lateral 

 petals emarg, spur- 

 bearing petal acum. 



9. The form of the spiir-bearing petal: 

 Commonly the spiir-bearing petal both 



in arvensis and tricolor is truncate or 



faintly emarginate; but in the dunes of 



the northern part of West-Jutland and 



upon Læsø types of tricolor are found, 



where this petal is pointed (Clausen 



1921, p. 209, fig. 1). I therefore disting- 



uish the following two types: 



Pointed {acum — acuminata): fig. 2. 



Not pointed {n.acum = non acum- 

 inata). 



10. The lateral sepals: 



I have found a special character of 

 these in some tricolors from dunes upon 

 Læsø. The lateral sepals are somewhat 

 incised at the tips: (fig. 2j. This character was not previously 

 known, and perhaps Læsø is the only place in the world, 

 where it can be found; and probably it came into existence 

 there endemically, by a mutation: 

 Lateral sepals entire {integ = integerrima). 

 Lateral sepals emarginate {emarg = emarginata). 



11. The epidermis-cells of the petals: 



The surface of the petals of the majority of pansies from 

 the gardens is velvet-like. This character is due to the epi- 

 dermis-cells, which are extended to many densely placed small 

 microscopic papils (fig. 3 a). The common wild types have 

 not so large and so densely placed epidermis-papils, that the 

 surface becomes velvet-like; but at Hadsund (Jutland) I 

 have found a type of tricolor growing wild with velvet-like 

 petals. This character I call velutina {veliit). 

 Common, not velvet-like petals: non-velutina {n.velut). 



12. The pollen-grains: 



In a dry state the pollen-grains are shrunken, but they 

 are able to absorb water very quickly. Then they swell and 

 assume a characteristic form: seen from the edge they are 

 ellipsoidal with a protuberant equatorial-belt (fig. 3 6), 

 but seen from above they appear either 4- or 5-edged (fig. 

 3 d^ e), less frequently 3- or 6-edged (fig. 3 c, /). It is the 

 protuberant equatorial-belt giving them this edged appearance. 



