1922] TAYLOR—PHAEOPHYCEAE 437 
tative methods of reproduction are present in most forms. Sav- 
VAGEAU (20) reports finding egg and sperm production on one 
individual of Halopetris scoparia, but could only find one type of 
gametangium in Cladostephus. If this observation is confirmed, it 
will either force Halopetris into the Cyclosporales, a removal of the 
whole family from its present position, or necessitate a wider inter- 
pretation of the Phaeosporales. The family as understood here 
includes the Choristocarpaceae of Lemmanaes 
Family 4. Asperoc ductive organs formed by 
the metamorphosis of, or as an outgrowth from, a superficial cell; 
growth intercalary. This family corresponds to the Encoeliaceae, 
Striariaceae, and Myriotrichaceae of KyELLMAN, the latter two 
representing simpler forms with the same essential construction. 
Plants are derived from a simple filament, becoming parenchymat- 
ous, either cylindrical or flattened. All stages can be traced. 
Gametangia with isogametes and sporangia are present, and con- 
siderable portions of the life history are known, especially of Aspero- 
coccus and Scytosiphon (10). The statement of YENDo (43) that the 
products of the plurilocular sporangia of Phyllitis are not gametes, 
but give rise to a microscopic gametophyte, requires confirma- 
tion. 
Family 5. Chordariaceae——Thallus differentiated into axial 
and assimilative filaments, branched, meristem localized; sporangia 
5 wepetracd pernliative filaments or modified segments therefrom. 
, the final short branches of the axial filaments 
turn watwartl and form a close cortex rich in chromatophores. 
Since both sporangia and gametangia are known in these genera, 
the life history is probably the same as that of Ectocarpus. The 
Elachisteaceae of KJELLMAN represent a reduced epiphytic group, 
and may best be incincest $ in the causes 
Family 6. D R organs formed by the 
metamorphosis of, or as an outgrowth from, a fea (or corticating) 
branch cell; growth trichothallic. The main axis in these forms is 
ramified, and produces short corticating branches, as well as (in 
some) delicate free ones. Little is known regarding the develop- 
ment of these genera; unilocular sporangia only are present, and 
there may be the same life history as in Dictyosiphon. 
