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Puget Sound Marine Sta. Pub. 



Vol. 1, No. 25 



sporangia very abundant, scattered irregularly throughout the surface 

 of the tube-like plant body. 



In quiet coves according to Saunders (13) p. 420. 



22. MYRIONEMA Greville 



1. Myrionema strangulans Grev. Crypt. Fl. p. 300. Fig. 32 



Plants forming small dark-brown patches on other algae, five to ten 



mm. or more in diameter; composed of a flat layer of decumbent cohering 



filaments from which arise the short, simple erect filaments; sporangia on 



short stalks or sessile between the erect filaments. 



Growing on Ulva Lactuca and other algae in the lower littoral zone. 



Scytosiphon 

 lomentarius 



30 



Myelophycus 

 intestinalis 



Myrionema 

 strangulans 



Ralfsia 

 verrucosa 



PLATE 60 



Fig. 30. Sketch of plant. X about 0.25. 



Fig. 31. Sketch of plant. (After Saunders.) X about 0.25. 



Fig. 32. a, Sketch of a top view of a "patch" on Ulva Lactuca; u, 

 Ulva cells ; b, sketch showing rows of cells ; s, sporangium. X about 400. 



Fig. 33. Diagram of a vertical section through a thallus showing 

 closely connected filaments. X about 400. 



