88 Knud Jessen. 



importance must be attached to the number of the vascular 

 bundles and their course in the leaf-stalk of Rubus. And as 

 the group Cylactis (Raf.) Focke in this as well as in most 

 other points has not previously been anatomically investigated 

 I shall give a description of the present case. With the ex- 

 ception of some individual variations the facts are as follows: 

 As in all the species investigated by Fritsch, and as in the 

 two other species mentioned here, so also in the present spe- 

 cies three vascular bundles enter the leaf-stalk; after a course 

 of about one cm. the two upper divide each into two bundles, 

 and in the whole length of the stalk up to a few mm. from 

 the leaf-blade there are five bundles; at this level one lateral 

 bundle on each side unites with the median one, but the 

 latter divides again into three before the stalk passes into 

 the leaf-blade. The bundles are stiffened by a fibrous tissue 

 along the sieve-tissue. 



As regards the structure of the flower of Rub. Chamæ- 

 morus Warming says in his notes: "Both in northernmost 

 Norway and in Greenland I found the cloud-berry to be purely 

 dioecious and the degree of abortion of the one sex was almost 

 the same in both places. If I may point out any differences 

 it would be that: (1) The Greenlandic flowers are perhaps 

 slightly smaller than the Norwegian; the diameter of the 

 latter I have found to vary between 2% and 3% cm. as 

 regards the male flowers and to be about 2 1 / 2 cm. for the 

 female flowers; the Greenlandic were 2 — 2 V:, cm. for both 

 kinds of flowers, but the material in hand was extremely 

 sparse. (2) The Greenlandic appear to have slightly less 

 rudimentary stamens in the female flowers and likewise 

 slightly less rudimentary pistils in the male flowers than 

 have the Norwegian. In the former the stamens had a some- 

 what larger anther, in the latter the carpel was more highly 

 developed and the ovule was even indicated, as the figures 

 show." .... "As regards the flower it may be added, 



