120 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 26 



PLATE 7 



Fig. 1, 5. Antithamnion pseudocorticatum sp. nov., from the type collection. 

 Fig. 1. A young determinate branch showing pairs of adaxial 

 branchlets from each basal cell. These produce cortication by con- 

 tinued growth, X 600; Fig. 5, a later stage showing clasping cortical 

 filaments, X 250 . 



Fig. 2. Antithamnion sublittoral S. & G. part of a sterile plant, X 60. 



Fig. 3. Antithamnion secundatum Gard. A mid-part of a sterile plant, X 120. 



Fig. 4. Crouania attenuata (Ag.) J. Ag. Mid-part of a sterile plant, X 170. 



