318 



and hydrochloric acid (Raciborski 1893) the reaction for myrio- 

 phyllin, which was found by the latter in the leaf-appendages; 

 on the ovarial outgrowths it is however less purely red in 

 colour than from the leaf-appendages, more brownish red. 



M. a. has formed fruits at several places, in Greenland 

 (Septbr.) at TunugdliarQk, 60°50' N. L., in Iceland (Aug.) among 

 other places at Breidalur; fruits from here have developed 

 embryos. The small quantity of fruit in the material is possibly 

 due, for Myrioyhyllum as for Hippuris, to the fact, that the 

 collections were in general not made in the autumn. 



Sylvén (1. с.) has only described and figured seedlings of Ж. a. 



Vegetative propagation probably occurs readily, even if the 

 winter-buds are not found, on detached parts of shoots as in 

 other regions (Sernander 1901; Glück 1906 etc.). 



M. alterniflorum is on the whole a more northerly species 

 than M. spicatmn, and a greater number of specimens have 

 been collected than of the latter. Both species have generally 

 a more slender appearance than is common in Denmark, possibly 

 connected with the less favourable conditions of life ; this refers 

 less to M. a. which is a slender species in any case. The 

 Greenland specimens of this species are not so strong as those 

 from Iceland, but there are only 3 individuals from the latter 

 country. 



CalUtrichaceae. 



Material from East and West Greenland, Iceland and the 

 Færoes together with a very few samples from Finmark. 



The following species have been found: C. autumnalis L., 

 C. hamulata Ktz., C. stagnalis Scop, and C. venia L. 



C. stagnalis which is a species belonging to the temperate 

 and warm regions e. g. found at Ceylon (Hegelm. 1864, p. 59, 

 ScHENCK 1886 a p. 161) has not been gathered in Greenland and 



