173 



6. Ectocarpus breviarticiilatus J. Ag. 



J. Agardh, Nya alger fran Mexico (Ofversigt af K. Vetensk.-Akad. 

 Forhandl. 16. Jan., 1847, p. 7). 



Ectocarpus hamatus Gr. in Maze et Schramm, Essai de classification 

 des Algues de la Guadeloupe, 2e Edit. 1870-1877, p. 111. 



VicKERs, A., Phycologia Barbadensis, part 11, pi. 29. 



By means of original specimens collected by Liebmann near 

 St. Augustin in Mexico and determined by J. Agardh I have 

 been able to see that Ectocarpus hamatus of Crouan, so well 

 figured in the "Phycologia" of M"*^ Vickers belongs to this species. 

 As the description of J. Agardh is rather deficient and M"^ Vickers 

 in her "Liste" does 



not give any descrip- — --' t '~'~~- — — ^^ 



tion of it I here men- 

 tion it in a little more 

 detail. 



The plant forms 

 rather large tufts, 2 — 

 4 cm high or even 

 more, and these tufts 

 are again composed 

 of thinner and thicker 

 rope-like spongy mas- 

 ses. By means of the 

 numerous hooks and 

 short bent ramuli, 

 spread along the main 

 filaments the whole 



becomes twisted together just as in Ectocarpus tomentosus. The 

 growth takes place at any point in the filaments. These are 

 about 27 p thick. The length of the cells is usually 1 — 2 times 

 their own diameter, rarely a little shorter or longer. 



The plurilocular sporangia are nearly spherical in shape or 

 somewhat ovoid (Fig. 136 b). They are placed nearly at right 

 angles upon the filaments and have a very short stalk consisting 

 only of a single small cell. The length of the sporangia is about 

 62 p ; the breadth about 57 p. 



Unilocular sporangia were not found. 



Instead of hooks the ramuli sometimes run out into thin 

 rhizoids (Fig. 136 d). 



Several small roundish or more irregular discoid chromato- 

 phores are present in each cell (Fig. 136 h). 



12 



Fig 136. Ectocarpus breviarticulatus J. Ag. 



a, a branch with young plurilocular sporangia. 



b, cells with chromatophores and a ripe pluri- 

 locular sporangium, c, a hookformed ramulus. 



(/, a branch with rhizoid-like apex. 

 (a, c and d, about 90 : 1 ; Z;, about 190 : 1). 



