PH ZOPHYCEAi 89 
The sori of unilocular sporangia are produced opposite 
the whorls, and the obovate sporangia arise as lateral 
outgrowths of filaments produced by the superficial 
cells, 
Stilophora (of which S. rhizodes is British, North 
Atlantic, and Mediterranean, and 8S. taberculosa, like 
Halorhiza, Baltic) has a filiform thallus with axial 
strands of cells which grow in length by division of 
the cells immediately below the apex, and a mantle 
of tissue enveloping this 
central axial tissue. The 
mantle consists of a few 
layers of parenchymatous 
cells, and originates in the 
branches of the axial series 
below the growing-point. 
The cells of the mantle 2 ; 
diminish in size towards Fic. oh —Beaophora rhizodes. 
the exterior. Ultimately, Lengel zetio ot, eroxin 
through the separation of Pemk) 
the axial tissue, the interior of the thallus becomes 
hollow. It differs further from the above forms 
and approaches the Chordariaccw in having both 
unilocular (obovate) and plurilocular sporangia, the 
latter with the loculi in one row. Both unilocular 
and plurilocular sporangia arise as lateral outgrowths 
of hairs produced by the superficial cells. 
