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 l ). On the 



Fig. 6. Primula sibirica. 

 A. Base of plant in bloom, the foliage-leaves are marked in their order from below up- 

 wards, 1, 2, 3, 4\ the uppermost. 4, subtends the main bud, which has already developed 2 

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

 and D 1 , the corresponding stigmas, pollen-grains and stigma-papillae, in the same size, 

 respectively. E, a long-styled flower, seen 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. /, anther J 

 longitudinal section through the distal part of the peduncle ( ,0 /i); a and a', 2 subtending leaves; 

 ft, pedicel; c, a rudiment of the second flower. (Alten Fjord, Norway). (^1 — / from Warming 1886.) 



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

 papillae are also larger, but the pollen-grains smaller (D 1 ). 



