168 



„ 2. A larger and older specimen of the plant. 

 „ 3. An older specimen forming transition to f. typica, with 

 the upper branches partly denudated. 



PI. 8, 



L. frutieulosum f. flexuosa. 



Fig. 1. An old specimen most nearly related to this form, with 

 an apparently coarse hypothallus, which, however, in 

 fact being caused thereby, that it is much infested with 

 L. flavescens. 

 „ 2. A specimen nearly related and probably referrible to f. 

 flexuosa, but on the other hand showing close affinity 

 to certain forms of L. tophiforme, or, perhaps, being a 

 hybrid between these two species. 



PL 9. 



L. fornicatum f. robusta. 



Fig. 1. An older specimen, hollow, but not yet opened itself in 

 the lower part. 



„ 2. A younger specimen apparently freely developed on the 

 bottom, and seems to have been branched from the 

 centre, but here already a small cavity formed. 



„ 3. A younger specimen nearly covering the one half of a 

 muscle (Mytilus modiolus). The other and lower half 

 of the shell not visible in the figure is partly covered 

 with L. delapsum, and both species grow over an earlier 

 founded individual of L. Stromfeltii. 



,, 4. A specimen with the apex of the branches truncate in the 

 part turning upwards, or here and there nearly disc- 

 shaped. 



PL 10. 



L. dimorphum. 

 Fig. 1. The upwards turned part of a specimen with the ends 



