[VoL. 2 
776 ANNALS OF THE MISSOURI BOTANICAL GARDEN 
lated genus. She concluded that the carbohydrates existed in 
the form of hemicelluloses, probably as pentosans. 
Glycogen, although frequently found in the ‘‘blue-greens,’’ 
where, as held by some authors (Fischer, ’05), it functions 
as the chief reserve carbohydrate, has been demonstrated in 
but one case, as far as is known, in the Chlorophyceae, and 
that by Beyerinck (’04) in Chlorella variegata. 
Simple sugars.—The nature of the simple sugars in the 
group is indefinite. Klebs (’96) reported a substance in the 
cells of certain Heterokonteae that reduced Fehling’s solu- 
tion, but this means little since most algae contain non- 
carbohydrate reducing substances made up chiefly of tannins 
and tannoidal bodies. Tihomirov (’10) used the phenyl- 
hydrazine method as modified by Senft (’04) for the detection 
of osozone-forming sugars in algal tissues in this group, 
chiefly those of Codiwm bursa and C. tomentosum. After a 
period of thirty days, for these two forms, yellow amorphous 
deposits appeared in the cells indicating a sugar reaction. 
The definite sugars these osozones represented could not be 
determined, but he suggests the possibility of dextrose and 
d-galactose. It seems evident that they must be present in 
very small quantities in the tissues investigated. 
PHAEOPHYCEAE 
Polysaccharides.—Starch is conspicuously absent from the 
great group of ‘‘browns,’’ but there are, however, certain less 
highly condensed polysaccharides present. Schmiedeberg 
(85) speaks of a dextrin-like compound which he isolated 
from Laminaria. He gave to it the name ‘‘laminarin’’ and 
the general formula, 10(C601005)-9H20. There seems, how- 
ever, to be some confusion regarding his method of arriving 
at these figures. Torup (’09) was able to extract a dextrin 
from Laminaria sp. with warm water, that gave dextrose on 
hydrolysis. This could be isolated only during the winter 
months. He called it ‘‘kreftin.’’ Kylin (’13), extracting 
crushed Laminaria saccharina, Fucus vesiculosus, and Asco- 
phyllum nodosum, obtained a dextrin-like compound similar 
to that described by Schmiedeberg and he retained Schmiede- 
