192 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 17 



PLATE 10 



Fig. 1. Erythrocladia ectozotca Dawson. Part of a colony from 



the type collection showing its appearance on the stalk 

 of Tuhularia. 



Figs. 2-3. Acrochaetium spiculiphilum Dawson, from the type 

 collection. Fig. 2. A plant at the surface of the host 

 showing both prostrate and erect, branched filaments. 

 Fig. 3. A branched filament at the surface of the host. 

 Fig. 4. A young plant with only prostrate filaments 

 deep within the host. 



Figs. 5-6. Acrochaetium ascidiophilum Dawson, from the type col- 

 lection. Fig. 5. A plant as viewed laterally b\' means of 

 a vertical section through the test of the host, showing 

 the deeply penetrating endozoic filaments and the short, 

 free filaments. (Only the surface line of the host indi- 

 cated.) Fig. 6. A branched, free filament bearing mono- 

 spores. 



Fig. 7. Cruoriella hancockii Dawson. Part of a vertical section 



through the type specimen showing a young tetra- 

 sporangium within the immersed nemathecium. 



Figs. 8-9. Peyssonelia rubra var. orientalis Weber van Bosse. 

 Fig. 8. Part of a tangential vertical section through a 

 tetrasporic plant of D. 7242, Bahia Agua Verde, Baja 

 Calif., showing the rounded appearance of the hypo- 

 thallial cells. Fig. 9. Part of a radial vertical section 

 through a tetrasporic plant of D. 3245, Punta Pal- 

 milla, Baja Calif. 



Fig. 10. Peyssonelia clarioncnsis Taylor. Part of a vertical 



section through a vegetative portion of the type speci- 

 men. 



Figs. 11-14. Cruoriopsis mexicana Dawson. Fig. 11. Part of a verti- 

 cal section through a vegetative portion of D. 4280. 

 Fig. 12. Part of a vertical section through a tetra- 

 sporangial portion of the type specimen. Figs. 13-14. 

 Two carpospore chains from D. 4280. 



