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 
Ectocarpus secundus, which possesses plurilocular 
sporangia and antheridia (sce p. 68). Zosterocarpus, 
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 Phlwospora in the 
Arctic and North Atlantic. Striaria and Phleospora 
are British, Some authors regard species of 
Phlwospora, probably correctly, as belonging to Sticty- 
osiphon (e.g. Phleospora tortilis), which accounts for 
the presence of that name in British marine floras, 
while others restrict Stictyosiphon to the single 
species S. adriaticus. 
ENCGELIACEA. 
General Characters—Though none of the Enceli- 
acce attain great size, the order is remarkable for the 
great diversity of the forms assumed by the thallus, 
including frond-hke, filamentous, club-shaped, glob- 
ular, hollow, reticulate, &c. shapes, though they 
agree in none of them having a definite system of 
branching. They are of parenchymatous structure and 
