167 



forming crust-like expansions, partly here and there 

 new branches in development. 



L. fruticulosum f. glomerata. 

 Fig. 3. Habit-figure of an older and typical specimen of the form. 



PL 5. 



L. fruticulosum f. fastigiata. 



Fig. 1. Habit-figure of a specimen nearly encompassing a stone. 



„ 2, 5, 6. Specimens freely developed on the bottom. 



„ 3. Tvo specimens freely developed on the bottom but ana- 

 stomosed. 



„ 4. A specimen apparently in the act of loosening itself from 

 the stone, to which it appears to have been more clo- 

 sely fastened. 



„ 7. A specimen somewhat approaching f. typica. 



P. 6. 



L. fruticulosum f. corymbiformis. 



Fig. 1. Habit-figure of an older specimen of the plant partly 

 being hollow. 



„ 2. A specimen with most of the upper branches denudated. 



„ 3. An old specimen forming transition to f. typica, however, 

 most closely related to the present form. The branches 

 are much denudated, the plant rather hollowed especi- 

 ally by boring-muscles, and the cavity later occupied 

 by other animals, as Mytilus and Pecten, the shells of 

 which are partly projecting. 



PL 7. 



L. fruticulosum f. flexuosa. 



Fig. 1. A smaller but fully developed specimen, larger but other- 

 wise closely coinciding with two specimens from Hauck's 

 herbarium of his L. fasciculatum. 



