EXPLANATION OF PLATES 



PLATE 9 



Hormiscm sphaerulifera S. and G. 

 Fig. 2. A, basal portion of filament showing intramatrical rhizoids. B, 

 vegetative cells in the median portion of the filament. C, an empty sporangium. 

 X 25. 



Hormiscia grandis (Kyliu) S. and G. 



Fig. 3. A, basal portion of filament showing numerous intramatrical rhizoids. 

 B, two zoosporangia of moderate size. C, a long typical zoosporangium, empty. 

 D, moderate sized vegetative segments. X 80. 



Soiitniscia penicilliformis (Roth) Fries 

 Fig. 4. A, sporeling with rhizoid penetrating a filament of Ulothrix flacca. B, 

 basal portion of a young filament, showing a few intramatrical rhizoids. C, 

 characteristic zoosporangia. D, young vegetative segments. X 80. 



Bhizodonium lubricum S. and G. 



Fig. 5. A, terminal portion of a young filament with short segments. B, 

 terminal portion of a filament with long, ' ' resting segments. ' ' X 160. 



Ulothrix pseudoflacca f. maxima S. and G. 

 Fig. 6. A, B, vegetative filaments. C, sporangia. X 250. 



Codium dimorphum Svedelius 



Fig. 7. A young utricle with an empty sporangium. X 80. 

 Fig. 8. A terminal portion of a utricle, showing the extremely thick, lamellate 

 and tuberculate end wall. X 100. 



Codium intertextum var. criTjosum M. A. Howe 



Fig. 9. Portion of the end wall of a utricle, showing internal modifications. 

 X 100. 



Codium Setchellii Gardner 



Fig. 10. Tj^iical utricle and sporangium, showing the scars of three previous 

 sporangia. X 80. 



Fig. 11. Showing different forms of utricles and sporangia. 



This plate is from Gardner, New Pac. Coast Mar. Alg. IV, 1919, pp. 487-496, 

 pi. 42. Fig. 9 was labeled Codium adhaerens. 



[326] 



