93 



to this form and in part according well in habit with the cited 

 hgure by Crouan. Some other specimens gathered at „Ile Ho- 

 lavre, dans le Golfe du Morbihan" are nearly related to f. australis, 

 but much smaller, the branches slightly thinner and very short, 

 thus somewhat differing from typical specimens of the form, and 

 ought perhaps to be considered as a separate form of the species. 

 The plant recorded by Ba t ters 1. c. as typical i. coralloides fully 

 coincides with f. australis in the sense here tåken, according to 

 specimens kindly communicated to me. Typically developed spe- 

 cimens of this form appear to be scarce with us. I have seen but 

 some few ones, but others partly approaching f. australis partly 

 f. norvegica have more often been met with. As such an inter- 

 mediate form I regard the specimens figured by Kjellman 1. c. 

 pl. 5, fig. 9 — 10, however, most nearly related to f. norvegica. 

 Cp. pl. 16, fig. 24—31. The figures 24 — 25 represent the present 

 form from Haugesund, fig. 26 a somewhat differing specimen from 

 Storfosen near Bejan, fig. 27 — 30 British specimens (from Cumbrae) 

 and fig. 31 a French specimen (from Morlaix). 



Of the form flaoelligera I have not seen typically developed 

 Norwegian specimens, but those represented on pl. 16, fig. 32 — 37 

 I gotthrough the kindness of Dr. Bornet „dragué å 1'embouchure 

 de la reviére de Morlaix (Finistére)". It is analogous to the form 

 alcicornis of L. tophiforme. The branches are rather irregularly 

 divided, with very short axes, spreading almost in one plane, either 

 subcylindrical or compressed, of about the same thickness as those 

 of f. australis, with rounded or almost truncate ends. Some other 

 specimens „jeté a la cote de St. Malo (Ille-et-Vilaine)" at least in 

 part belong to the same form, or forming transitions to f. australis. 



The form suhsimplex is closely connected with f. australis, 

 distinguished by the entire or almost entire absence of lateral bran- 

 ches, the whole frond being simple or nearly simple, and either 

 straight or angularly bent. Cp. pl. 16, fig. 38 — 42 (British speci- 

 mens). Of this form I have not seen any characteristic Norwegian 

 specimen, either, but only transitions to it. 



The species is as to the structure characterized by its rather 

 small cells. They are in a longitudinal section of a branch 7-9 



