174 



L. coalescens. 

 Fig. 15 — 20. Habit-figures of the plant. 



L. Icevigatum. 



Fig. 21 — 23. Habit-figure of a younger Norwegian specimen (fig. 

 22) and fragments of two Helgolandian. 



L. squamulosum. 

 Fig. 24 — 26. Habit-figures of the plant. 



PL 20. 



L. congregatum. 



Fig. 1 — 3. Habit-figures of the part of the plant that has turned 

 upwards. 



„ 4. A specimen seen from below, with the lower part of the 

 branch-systems denudated. 



„ 5. A similar specimen with new local formations partly cove- 

 ring the rubbing parts of the denudated branches, 

 and new branches here and there in development. 



„ 6. A similar specimen with numerous new-developed branches. 



PL 21. 



L. nodulosum. 



Fig. 1 — 6. Habit-figures of the plant; fig. 4 an old specimen with 

 the ultimate branches somewhat denudated. 



L. tophiforme f. typica. 

 Fig. 7, 10. Habit-figures of the form. 



L. tophiforme f. squarrosa. 

 Fig. 8 — 9. Habit-figures. 



PL 22. 



L. flabellatum f. Granii. 

 Fig. 1. Habit-figure of a younger individual. 



