128 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 26 



PLATE 11 



Fig. 1. Callithamnion rupicolum Anders. Upper part of a spermatangial 

 plant, X 80. 



Fig. 2-3. Callithamnion soccoriense Taylor. Fig. 2, upper part of a spermatan- 

 gial plant, X 33; Fig. 3, Detail of spermatangial clusters, X 105. 



Fig. 4. Callithamnion uncinatum sp. nov. Branching habit of an upper part 

 of a plant of the type collection, X 40. 



