104 SEAWEEDS 



plurilocular sporangia leads to a certain amount of 

 hesitation in adopting the presumption that these 

 always contain gametes or even potential gametes. 

 It recalls the difficulty presented by the case of 

 Ectocaiyms secundus, which possesses plurilocular 

 sporangia and antheridia (sec p. 68). Zostcrocarpus, 

 a genus recently founded by M. Bornet, appears to 

 be most nearly related to Kjellmania, especially in 

 the mode of formation of the sori of sporangia. 



The Geographical Distribution is mainly in the 

 North Atlantic and Arctic oceans. Stictyosiphon 

 occurs in the Mediterranean and South Atlantic, 

 Kjellmania in the Baltic, Striaria in the North 

 Atlantic and Mediterranean, and Ptdctospora in the 

 Arctic and North Atlantic. Striaria and Phl-ceospora 

 are British. Some authors regard species of 

 Pklceospora, probably correctly, as belonging to Sticty- 

 osiphon (e.g. Phlceospora tortilis), which accounts for 

 the presence of that name in British marine floras, 

 while others restrict Stictyosiphon to the single 

 species S, adriaticus. 



ENCCELIACE.E. 



General Characters. Though none of the Enccdi- 

 acece attain great size, the order is remarkable for the 

 great diversity of the forms assumed by the thallus, 

 including frond-like, filamentous, club-shaped, glob- 

 ular, hollow, reticulate, &c. shapes, though they 

 agree in none of them having a definite system of 

 branching. They arc of parenchymatous structure and 



