323 



Fig. 325. Dasya ocellata (Gratel.) Harv. 

 Apex of plant. 

 (About 350:1). 



about 15 |ii thick. At the summit of the main filaments the ramuli 

 are bent upwards covering the growing point entirely. 



The cortical layer is highly developed, covering the stems quite 

 densely from base to summit. The specimens found form dense 

 dark red-brown tufts 

 about 4 cm high or even 

 more. They are richly 

 ramified and on the 

 whole vigorously de- 

 veloped. The breadth 

 of the branch-system 

 with the covering ra- 

 muli is nearly a half 

 cm. 



The stichidia are 

 cylindrical to conical, 

 running out in a shorter or longer sterile point. The stalk is 

 composed of 1. to 7 or more cells. 



Dasya ocellata was found growing upon the roots of the mang- 

 roves to which it is fastened by means of a small disc. It was growing 

 in a sheltered locality and in shallow water. It had tetrasporangia 

 in the month of January. 



Only found once, St. Thomas: Bovoni Lagoon. 



Geogr. Distrib.: Bermuda, Mediterranean Sea, Morocco, wanner 

 parts of the European Atlantic coast. 



5. Dasya corymbifera J. Ag. 



J. AGARDH, In Historiam Alg. Symbol* (Linnsea, vol. 16, 1841, p. 31); 

 Spec. Alg., vol. II, p. Ill, p. 1219. CROUAN, Fl. Finistere, p. 159. ZANAR- 

 DINI, G.. Iconogr. Phyc. Med.-Adriat., vol. II. pi. 59. 



Dasya orbuscula var. mucilaginosum Grn., Alg. mar. Finistere, No. 286. 



Dasya venusta Harv., Phyc, Brit., pi. 225. 



The specimens reach a heigth of about 5 7 cm. They have 5 

 pericentral cells; the cortex is not much developed, the central cells 

 being clearly seen through it. The ramuli are monosiphonous with 

 thicker, 50 -60 ^ thick, cells at their base, thinner upwards, becom- 

 ing very slender at their summit. The branches of the ramuli are 

 spreading in all directions. 



Tetrasporic plants were the only ones found. The stichidia are 

 developed on the summit of a branch in the ramuli. They have gene- 



21* 



