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1 CSM 
Special Morphology and C. 
Ai Lao ? on) a F | ito he x O44 9, 
* Ta) *% x ‘ _ vw ~ . } oS, , 
oe alle se akan che Pane yee de eet rae PP A ea a) ie en i : 
Fly | An tanls ip or all aie lias is bg sty 6A Awe 
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lasstfi 
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a 
cation. 
alkali, and still are for that of iodine. Gigarthina helmin- 
thochortos furnishes ‘worm-moss,’ but is usually adulterated 
with other species of marine Algz. | 
It cannot be said that there is at present any classifica- 
tion of Algez on a truly scientific basis. In its place a 
Fic. 387.—The gulf-weed, Sargassum natans, with globular berry-like swimming- 
bladders (natural size). 
selection may be made of typical forms, round which the 
rest group themselves. | , 
The NostTocacE form filiform unbranched rows of cells. The 
filaments are free in Oscéllatoria ; while in /Vostoc they are enclosed in > 
gelatinous envelopes, and by the melting of these are often united into 
larger colonies. The vegetative cells, which are capable of dividing” 
into daughter-cells, contain a homogeneous or granular protoplasm of a 
255 
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