154 O. Hagerup. 



The following literature has been used (complete list of literature 

 available is given in Gigers monograph). 



Brenner, M., 1909: Några Linnaea-former i Finland (Medd. af Soc. 



pro fauna et flora Fennica, h. 34, p. 89 — 97 og h. 35, pag. 56). 

 Giger, Emil, 1913: Linnaea borealis L., eine monographische Studie 



(Beihefte zum Bot. Centralblatt, Band XXX, Zweite Abt.). 

 Gundersen, 1910: Recherches anatomique sur les Caprifoliacées 



(Thesè; Paris). 

 Leist, K., 1889: Über den Einfluss des alpinen Standortes auf die 



Ausbildungder Laubblätter. (Mittheil. d. Naturf. Gesellsch. v. Bern.) 

 Norman, J. M. 1895: Norges arktiske Flora, II, pag. 324. Kristiania. 

 Petersen, O. G., 1901: Diagnostisk Vedanatomi, pag. 93. Kobenhavn. 

 Poppius, B. R., 1903: Blombiologiska iakttagelser (Acta Soc. pro fauna 



et flora Fenn. 25, No. 1). 

 Schröter, C, 1904: Das Pflanzenleben d. Alpen, I. p. 235. 

 Sernander, R., 1891: Studier öfver skottbyggnaden hos Linnaea 



borealis L. (Bot. Notiser 1891, p. 225). 

 Silen, F., 1905: Blombiologiska iakttagelser i Kittilä Lappmark 



(Medd. af Soc. pro fauna et flora Fenn., h. 31. p. 88). 

 Sylvén, N., 1906: Om de svenska Dikotyledonernas första förstärk- 



ningsstadium; 1 (Kungl. Svenska Vetenskapsakademiens Hand- 



lingar, Band 40, No. 2, p. 65). 

 Wagner, A., 1892: Zur Kenntniss des Blattbaues d. Alpenpflanzen 



und dessen biol. Bedeutung. (Sitz. Ber. der Wien. Akad., math.- 



nat. CL, p. 615, Bd. C 1, Abt. 1). 

 Wittrock, V. B., 1879: Om Linnaea borealis (Bot. Not. 1878, p. 17, 



49, 83, 122 and 1879, p. 9, 137). 

 — 1907: Linnaea borealis (Acta Horti Bergiani, Bd. 4, No. 7). 

 Wydler, H., 1859: Morphologische Mittheilungen (Flora N. R. 17, p. 1). 



Germination. According to the literature Linnaea .seldom 

 produces germinable seeds in Central Europe, while seeds 

 from the North germinate within a few weeks. Wittrock has 

 found a seedling grown under natural conditions. The further 

 development of the seedling has been examined through cul- 

 tures by Giger; the results are briefly as follows: the germinable 

 power of the seeds lasts for at least three years, and the deve- 

 lopment of the seedling proceeds slowly, especially at first ; 

 during the second year the main axis, consisting of 2 — 4 inter- 

 nodes, inclines horizontally towards the ground, and becomes 



