400 ALLAX HANCOCK PACIFIC EXPEDITIONS VOL. 3 



PLATE 51 



Fig. 1. Ceramium equisetoides, a short tetrasporangial branch, x 200. 



Fig. 2. Ceramium Camouii, tip of a sterile branch of the tj-pe, x 300. 



Fig. 3. Ceramium Camouii, portion of a tetrasporangial branch 

 showing cortical involucre, x 300. 



Fig. 4. Ceramium affine, a branch of a specimen from the tjpe col- 

 lection bearing tetrasporangia, x 240. 



