THE GREEN ALGAE OF NORTH AMERICA 141 



7. PRASINOCLADUS Kuckuck, 1894, p. 261. 

 Plants filamentous, branching above ; filaments formed of 

 compartments, those below empty, the terminal containing 

 green cells ; cells with band-shaped chromatophore and red 

 stigma. Reproduction by cells becoming 4-ciliate, otherwise 

 unchanged. 



P. SUBSALSUS B. M. Davis in P. B.-A., No. 564; Englenop- 

 sis subsalsa Davis, 1894, p. 388, PI. XIX. Filaments monil- 

 iform, when mature about }{ mm. long, at first simple, then 

 di-tri-chotomously branching ; cells oblong, 12-20X6-9 /a; chro- 

 matophore bright green, usually extending round the cell, with 

 no pyrenoid ; compartments of filament about the same size as 

 the cells, separated from each other by 1-4 thin, hyaline cross- 

 walls ; cilia at the lower end of the motile cells. Forming a 

 thin coating, velvety or gelatinous, on pebbles, Spartina, etc. ; 

 salt marshes and sheltered rock pools. Fig. 29. Mass., Me. 



Oltmanns, 1904, p. 136, proposes the family Chlorodendraceae 

 for this and a few other forms, as being perhaps the nearest rela- 

 tives of the Flagellates among the green algae ; but while the 

 resemblance is striking, the line of connection with undoubted 

 members of the Tetrasporaceae is so continuous, from Prasino- 

 cladus subsalsns through P. lubricns Kuckuck, Ecballocystis pid- 

 vinata Bohlin, E. japonica Yendo, and CoHinsiella tuberculata 

 Setchell and Gardner, that the inclusion of all these forms in 

 the Tetrasporaceae seems justified. 



8. COLLINSIELLA Setchell and Gardner, 1903, p. 204. 



Frond gelatinous, solid or later hollow, composed of pyri- 

 form cells, on dichotomous, gelatinous stalks tapering down- 

 ward from the cells ; all enclosed in the general gelatine. 

 Chromatophore band-shaped, with one large pyrenoid ; zo- 

 ospores (?) formed from the contents of the cells. 



C. TUBERCULATA Setchell and Gardner, 1903, p. 204, PI. 

 XVII, figs. 1-7; P. B.-A., No. 909; Ecballocystis Willeana 

 Yendo, 1903, p. 199, Pi. VIII, figs. 1-15. Frond dark green, 

 firmly gelatinous, tuberculate; cells 12-20X9-12 /u; cells divid- 

 ing, one daughter cell remaining in position, the other pushing 

 on, at the end of the tapering stalk ; this division many times 

 repeated ; lower part of the frond attached to the substratum by 

 filamentous outgrowth from the lower cells. Zoospores (?) 8-16, 

 or sometimes more, in the cells in the middle and upper part 

 of the frond. Forming minute tubercles on stones in pools. 

 Fig. 30. 



Vancouver Isl. to Cal. 



