202 



Fr. J. Mathiesen. 



p. 307. Pax and Knuth, 1905, p. 188, etc. Ostenfeld, 1910, 

 p. 61. 



Alcohol material from Jugor Schar ( 9 ls 1882), collected by Th. 

 Holm. Herbarium material from Arctic America (var. arctica Knuth, 

 Herschell Island 13 ; 7 1906, A. H. Lindström); Arctic Siberia (Chaba- 

 rowa, August, 1894, H. Fisher; Wajgatsch, July, 1875, Fr. R. Kjell- 

 man and À. N. Lundstrom); also from Central Europe (the Alps, the 

 Carpathians). 



This plant developes long and short shoots alternately 

 on the same axis (see fig. 19, A) and is similar to A. lactea, 



which is described by 

 Wydler, as having the 

 densely leaved rosettes 

 separated by long-jointed 

 internodes. 



In the species here de- 

 scribed, the peduncles are 

 terminal (thus differing 

 from A. lactea), the reju- 

 venescence must therefore 

 be effected by means of 

 axillary buds (fig. 19, B). 

 During the summer in 

 which the parent-shoot 

 forms its peduncle, some 

 of these buds develop 

 into lateral shoots similar 

 in structure to that of 

 the parent-shoot. The 

 length of the long-jointed internodes varies greatly, from 

 5 cm down to a few mm, and sometimes even less, so that 

 the plant becomes almost cushion-like. 



The rosettes are generally bent towards the ground, or' 

 even rest on this, in which case adventitious roots may 

 develop, and facilitate the vegetative extension of the plant; 



Fig. 19. Androsaces chamaejasme. 

 A, a small specimen from Herschell Island, (see 

 the text); the plant shows the withered remains of 

 4 peduncles, the one furthest to the left is the 

 youngest, the middle one the oldest, (Va). B, ro- 

 sette with 3 rejuvenation buds, ( 2 /i)- C, re- 

 juvenating shoot, where the change from long 

 internodes to the densely leaved rosettes has taken 

 place twice, ( s /i). (A from Herschell Island, JSand 

 C from Wajgatsch.) 



