434 
THE SEAWEEDS 
Lejolisia Bornet. Griffithsia Agardh. Bornetia Thuret. Monospora 
Solier. Pleonosporium Naegeli. Callithamnion Lyngbye. Spongoclonium 
Sonder. TIaloplegma Montague. Euptilota Kiitzing. Rhodocallis 
Kiitzing. Ptilota Agardh. Dasyphila Sonder. Muellerena Schmitz. Psilo- 
thallia Schmitz. Pallia Harvey. Antithanvnion Naegeli. Crouania J. 
Agardh. Lasiothalia Harvey. Galiya Harvey. Ptilocladia Sonder. 
Spyridia Harvey. Bracebridgia J. Agardh. Haliacantha J. Agardh. 
Ceramium Wiggers. Thamnocarpus Harvey. Wrangelia Ag. 
Family DELESSERIACFAE. 
Plants usually foliaceous, simple, sometimes bushy, alternately or infre- 
quently dichotomously branched, the branches membranous or infrequently 
subcylindrical ; growth from an apical cell producing an axial row that 
originates connected lateral cell rows of several degrees to produce a mem- 
brane and sometimes also a cortex ; sporangia tetrahedral, usually in super- 
ficial sori ; spermatangia in sori ; procarp borne on a supporting cell which 
first segregates a special segment from which sterile cells are formed and 
then two lateral cells, both giving rise to four-celled carpogenic branches, 
or one forming such a branch and the other a second group of sterile cells ; 
auxiliaries developed from the support after fertilization; cystocarp with 
a basal fusion cell and branched gonimoblasts, the inner cells of which are 
sterile, the outer (or the outermost) carposporangial, the whole invested by 
a thin, inflated, osteolate pericarp. 
Kylin differentiates three types in the Delesseriaceae, viz. : — 
(1) Typical Delesseriaceae. — Hypoglossum Kiitzing. Chauvinia 
Harvey. Pliytimorpha J. Agardh. Apoglossum J. Agardh. 
Hemineura Harvey. Caloglossa (Harvey) J. Agardh. Claudea 
Lamouroux. 
(2) The Nitophyllum type. — Nitophyllum Greville. Platyclinia J. 
Agardh. Pachyglossum J. Agardh. Martensia Hering. 
(3) The Sarcomenia type.— Sarcomenia Sonder. 
Probably Sonder ella Schmitz and Sonderia F. v. Mueller also. 
Family DASYACEAE. 
Plants bushy or with long, cylindrical primary branches, these coarse in 
simple specimens to more slender in bushy types; primary axes bearing 
radially or dorsiventrally monosiphonous branched filaments of limited 
growth which may be free or united into a network ; growth not continuous 
from a persisting apical cell, the successive segments before cortication pro- 
ducing laterally a new growing point displacing the preceding apex, which 
