196 ALLAN HANCOCK. PACIFIC EXPEDITIONS VOL. 17 



PLATE 12 



Fig. 1. Acrochartiuin sinicolum (Dawson) Papenfuss. Habit 



of a plant of the type collection. X 161. 



Fig. 2. Acrochaeliitin liancockii (Dawson) Papenfuss. Basal 



part of a filament of the type collection. X 462. 



Fig. 3. Helm'tnthocladia calif ornica (J. Ag. ) Kylin. Part of a 



plant from Point Dume, southern California. X 0.7. 



Figs. 4-5. Gelidiclla stidiidiospora Dawson, from the type col- 

 lection. Fig. 4. Part of a mature tetrasporangial plant 

 to show habit. X SO. Fig. 5. A tetrasporangial stichidium 

 shown semi-diagramaticalh- in median f)ptical view. 

 X 156. 



Figs. 6-7. Gelidiella hancockii Dawson. Fig. 6. Habit of a plant 

 from Isla Angel de la Guarda, D. 288-40. X 4.6. Fig. 7. 

 A tetrasporangial branchlet from the t\ pe collection. 

 X 32. 



