1917 



Muenscher; Key to Phaeophyceae 



269 



16. SORANTHERA Postels & Ruprecht 



1. SoRANTHERA uLVoiDEA Post. & Rupr. Illustr, Algar. p. 19. Fig. 25 



Plant body a brown inflated sac, usually oval or nearly round; sac 



composed of two layers of tissue, the inner of large nearly colorless cells, 



the cortical layer of small colorless cells. Sori very abundant and evenly 



distributed over the surface of the plant. 



Usually growing on Rhodomela Larix or Odonthalia ssp. near the low 



tide line on somewhat muddy shores. 



17. COILODESME Stroemfelt 



Plant body hollow, cylindrical or oval; stipe very short and incon- 

 spicuous; holdfast minute, disc-like. The expanded sac composed of two 

 or three layers of tissue, the inner layer of large mostly colorless cylindri- 



26 



Soranthera ulvoidea Coilodesme bulligera Coilodesme californica 



PLATE 58 



Fig. 25. Sketch of large and small plants, attached to Rhodomela 

 Larix. X !• 



Fig. 26. Sketch of plant. X 0.5. 



Fig. 27. Sketch of plant on CystophyUum r/emiiwfnm. X 0.5. 



