178 



Fr. J. Mathiesen. 



in other heterostylous species are again met with here. The 

 stigma of the short-styled flower is smaller, with smaller 

 papillae, but the pollen-grains are larger (see fig. C\). On the 



Fig. 6. Primula sibirica. 

 Л, Base of plant in bloom, tlie foliage-leaves are marked in their order from below up- 

 wards, 1, 2,3, 4; the uppermost, 4, subtends the main fiud, which has already developed 2 

 foliage-leaves (g). B, a foliage-leaf. C, short-styled flower. D, long-styled flower. C" 

 and X)^, the corresponding stigmas, pollen-grains and stigma-papillae, in the same size' 

 respectively. E, a long-styled flower, ssen from behind. F, the stigma level with the 

 distal parts of the anthers ; the stigma papillae are illustrated to the left. G, a long-styled 

 flower with much protruding style. H, a similar one, with still longer style. I, anther. J 

 longitudinal section through the distal part of the peduncle ("/i); « and a', 2 subtending leaves; 

 b, pedicel; c, a rudiment of the second flower. (Alten Fjord, Xorway). (A — / from Warming 1886.) 



other hand the stigma is larger in the long-styled species, the 

 papillae are also larger, but the pollen-grains smaller (i)^). 



