478 Fr. J. Mathiesen. 



The winter-buds are provided with a number of bud-scales; 

 these as well as the foliage-leaves leave real leaf-scars on 

 the mesocorme on decaying. Adventitious roots are devel- 

 oped rather abundantly, especially from the basal part of 

 the mesocorme, they generally occur in connection with 

 innovation buds; the adventitious roots are somewhat 

 swollen. 



The innovation-buds arise from the axils of the scale- 

 leaves; the lower buds on the mesocorme do not generally 

 develop any further, but remain as reserve-buds; as in P. 

 Oederi it is the buds which occur in the axils of the inner- 

 most scale-leaves formed during the summer previous to 

 that in which the parent-shoot flowered, which are the most 

 vigorously developed. Usually only two of these buds ex- 

 pand, but the number may be more, in a single case I counted 

 as many as 6. 



During their first summer the adventitious-shoots always 

 bear two fully-expanded foliage-leaves; as in the main- 

 shoot the terminal bud is protected by scale-leaves. In case 

 flowering does not take place in the following year, — it 

 may occur, but no doubt only exceptionally, — a rosette 

 of foliage-leaves is developed, followed in turn by scale- 

 leaves, and then, after passing through still another winter 

 the shoot, in the majority of cases, succeeds in flowering. 



In a specimen from Ignerit (Greenland) in which 2 of 

 the basal buds on the mesocorme had developed further, 

 one of them had formed rosettes of foliage-leaves for 4 suc- 

 cessive summers, and the other for even 5. 



In a winter-bud (the specimen in question was collected 

 by N. Hartz, on the 18th of February 1892, on Danmarks 

 0, East Greenland) there were found young foliar organs 

 and flowers, all of which were highly developed; in the 

 young flowers the separate parts were quite distinguishable 



