— 204 — 



the antheridial stands in Chondria dasyphylla, explains as Ihe central 

 cells and the cells which bear the spermatia-forming cells as pericentral 

 cells. As a transverse section of the antheridial stands (Fig. 19 C) 

 shows, cavities are present among the filaments in the interior. 



Fig. 19 E shows a part of the antheridial stand more magnified, 

 seen from above, and fig. 19 D a transverse section of the peri- 

 central cells with the same magnification; we see that each cell of 

 the pericentral cells bears 3 — 4 antheridia. 



This species occurs in shallow water both on sheltered and 

 more open exposed coasts. In sheltered localities, e. g. in the 

 lagoon where it is a common and characteristic species in the 

 communities of algae which grow upon the roots of the mangroves, 



I te-/ 



/.Lis 



^200/ 



aQ 



D 



Fig. 19. Acantlioioliora spicifera (Vahl). nob. 



A, trichoblast with a young antheridial stand (200 : 1). B, older antheridial stand (75 : 1). 



C, transverse section of an antheridial stand (150 : 1). D, part of the same more magnified 



(400 : 1). E, the same seen from above (400 : 1). 



the habit of the plant is more slender, the ramuli are more openly 

 placed and bear fewer spines just as the colour of the plant is 

 often darker. 



The plant has been found with tetraspores, antheridia and 

 cystocarps in the months January— March. This species is very 

 common at the shores of the Islands. 



Orifflthsia globifera (Harv.) J. Ag. 



J. Agardh, "Epicrisis", 1876 p. 67. De-Toni, "Sylloge Alg.", 

 Vol. IV, p. 1280. Gr. corallina"^ var. globifera Harvey, "Nereis, 



