NEMATOPHYCER. 127 
OrverR IV. NEMATOPHYCE2A. 
Multicellular alge, chlorophyllose, membranaceous or fila- 
mentous, with or without branches. Vegetation either terminal, 
limited or unlimited, forming an articulate thread, or in the 
beginning terminal, and afterwards lateral, forming a mem- 
branaceous thallus of a single stratum. Cell multiplication by 
repeated division in one or two directions. 
Propagation by oospores, or by zoogonidia. 
Divided into the following families :— 
A. Vegetation by division of the cells at first in one, and 
afterwards in two directions, forming a membranaceous thallus. 
Famity I. Unvacez.—Thallus membranaceous formed of one 
stratum of cells, either plane or expanded, or tubular, or saccate. 
B. Vegetation by division of the cells in one direction, 
forming a cellular series or articulate thread. 
Famity IJ].—Spuzrorpiex.—Articulate thread not branched, 
articulations greatly elongated, cylindrical, multilocular, chloro- 
phyll mass distributed in ring-like bands. 
Propagation by resting spores, which, before germination, 
break up into zoospores. 
Famity III. Conrervacrz.—Articulate thread, simple or 
branched, vegetative articulations cylindrical, fructiferous always 
more or less swollen. Chlorophyllose mass effused, or parietal, 
often more or less regularly spiral. 
Propagation by macro- and micro-gonidia. 
Famity IV. PiraopHoracea.—Cladophora-like plants, 
with terminal vegetation. Articulate threads branched. 
Propagation by neutral, quiescent, cask-shaped spores 
(agamo-hypnospores). 
Famity V. C£pocontacea#.—Articulate thread either 
branched or not branched; articulations short. 
Propagation by oospores after sexual fecundation. 
Famity VI. Unorricuz#.—Articulate thread not branched, 
sometimes laterally connate; articulations short, at times very 
short. 
Propagation by macro- and micro-gonidia. 
Famity VII. Curootzripa.—Aérial alge. Articulate 
thread branched, cell membrane firm, filled with an equally dis- 
tributed oleaginous golden or reddish endochrome, 
Propagation by zoogonidia. 
Famity VIII. Cuarornorrm.—Aquaticalge. Articulate 
thread dichotomously branched, ramuli sometimes aggregated in 
a fasciculate or penicellate manner. Chlorophyllose mass 
usually collected in transverse bands. » 
Propagation by zoogonidia,—Rabh, Alg, Eur. 111, 286. 
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