Some Observations on the Genus Kubus. 1G7 



The last mentioned modification reminds one of ß. fissus, although it seems 

 to differ from this subspecies by considerably longer filaments. It can 

 perhapa, be the form of It. fissus, which Mr. Krause (Ber. der. Deutsch. Bot. 

 Ges. 1886, page 81) marked with 7, 13. 



The variety coujungens has, in regard to the form of the leaflets on the 

 turiones, a very great likeness to R. sulcatus, although, by the armature on 

 the turiones, and tbe form of their terminal leaHet, it makes itself known as a 

 variety of R. suberectus. It gives also a remarkable illustration of 

 the fact, already several times alluded to, that two species, subspecies or 

 varieties closely connected with each other, can produce forms which cor- 

 respond with each other, or are what is called aualogous. Like as R. fruti- 

 cosus, also R. suberectus, for instance, can, in the western part of the Scan- 

 dinavian peninsula, produce forms that more or less approach R. sulcatus. 



Et. * fissus Lindl. Syn. Ed. 2, pag. 92; Lindeb. Herb. Rub. Scand. n. 27. 



This subspecies appears on open places along the western coast. viz, in 

 Salland, at Falkenberg and Tvååker (Lindeb. 1. c), and in Norway, at Grimstad, 

 Christiansand, Mandal, Laurvik (Lindeberg), Porsgrund, and Nötterö. 



acicularis F. Aresch. in Blvtt, Norg. Flora, pag. 1156; aculeis turionum 

 gracilibus, aciculiformibus, creberrimis, subrectis. 



This variety is found at Nordre Aarö and Nötterö, on the south coast of 

 Norway (Herb. üniv. Christ.). It corresponds in evety other respect, even by 

 its short filaments, with R. fissus. 



R. * fissus agrees, in all respects, with the form that grows in Denmark, 

 as well as in the north of Germany and England. In the north of Germany, 

 to judge from the description given by Krause (Ber. d. Deutsch. Bot. Gesells. 

 188b', page 81), it seems to have a wider spread, than was before supposed, 

 and varies also in the eastern part of this country. It also appears, according 

 to the account of the just mentioned author, as if the variability of this sub- 

 species tended in the direction of R. suberectus. Its extension on the Scan- 

 dinavian peninsula shows, that it is a more or less western, maritime form. 

 I therefore consider it to be very probable, indeed, nearly certain that R. 

 fissus has originated from II. suberectus, and that it has arisen under the 

 influence of a prevailing maritime climate, in the west of Europé. It is there- 

 fore aualogous to 11. fruticosus. That intermediate forms arise between the 

 -ubspeeies and the |>arent species itself on the börders of the area of their 



Lun.ls Univ. År-skrift. Tom. XXII. - T2 



