216 Fitst Annual Report 
Heterosiphonia subsecunda (Suhr) Falk. 
(Figure 124) 
Hpiphytic on other alge. Stichidia .8 mm. in length. 
Dasya pacifica Harv. 
(Figure 125) 
Occasional in beach wrack. Stichidia .45 mm. in length. 
CERAMIACEAE 
Spermothamnion snyderae Farlow 
(Figure 126) 
Occasional in small colonies on the under side of ledges in the 
lower tidal zone. Sporangia .1 mm. in diameter. 
Griffithsia sp. 
(Figure 127) 
A common epiphyte on the alge of the lower tidal zone. Spor- 
angia .08 mm. in diameter. Dr. Setchell says of this plant: ‘‘The 
specimens all have tetraspores. I wish very much that it might be 
found with cystocarps. Until then we shall be uncertain as to the 
genus. Griffithsia is perhaps hardly to be applied to this plant. In 
all probability it is more likely to belong to one of the related genera, 
but it is impossible to decide this with certainty until we have the 
eystocarpiec fruit.’’ 
Callithamnion rupicolum forma pygmaeum Collins 
(Figures 128 and 129) 
An oceasional epiphyte on other alge of the lower tidal zone. 
Sporangia .07 mm. in diameter. Cystoearps .2 mm. in diameter. 
Antithamnion floccosum (Muell.) Klein 
An epiphyte on Nereocystis. 
Spyridia filamentosa (Wulf.) Harv. 
Rare in the beach wrack. 
Ceramium codicola J. Ag. 
(Figure 130) 
Common on Codium mucronatum, length commonly 1 em. 
Centroceras clavulatum (Ag.) Mont. 
Abundant on the rocks of the upper tidal zone. 
Microcladia coulteri Harv. 
Epiphytie on Prionitis. 
