20 MISSOURI BOTANICAL GARDEN BULLETIN 
paper three unusually interesting genera are discussed, 
namely, Tremellodendron, Eichleriella, and Sebacina. Of 
the first named, seven species are described; of the second, 
five; and of the third, fourteen species. Among these, eleven 
species are new and several new combinations are given. 
Davis, A. R. Ann. Mo. Bot. Gard. 2:771-836. Studyin 
the distribution and intensity of action of the digestive an 
other ferments in marine algae, some results of special sig- 
nificance have been obtained. Ferments digesting starch and 
related carbohydrates were isolated, but no ferment digesting 
either cane or malt sugar could be identified. Likewise, no 
enzyme was found which would digest the cellulose walls of 
plants, and none affecting simple esters. In all cases the fer- 
ments isolated were found to act with unusual slowness, but 
it is suggested that certain inhibiting agents are responsible 
for the low rate. It seems possible that tannoid compounds 
may be important in this connection. 
Duggar. B. M. Ann. Mo. Bot. Gard. 2:403-458. Among 
the more important parasitic root fungi of economic plants 
are Rhizoctonia Crocorum, the violet root felt fungus so long 
well known in Europe, and R. Solani, the common American 
species. In this study an account is given of the distribution 
of these two fungi throughout the world, a description of the 
types of diseases induced by them, and an exposition of the 
morphological and pathological differences between the 
— together with notes upon other species less well 
nown. 
Greenman, J.M. Ann. Mo. Bot. Gard. 2:573-626. This 
article marks the beginning of a series which will constitute 
a monograph of the genus Senecio or groundsel. This large 
genus of composites is particularly well represented in the 
western United States and southward, and the material for 
the study has been collected for a period of years. The first 
article includes descriptions of thirty-two species represent- 
ing a few sections of the subgenus Eusenecio. 
Knudson, L. Ann. Mo. Bot. Gard. 2: 659-664. In this 
study it is shown that one of the hexose sugars, galactose, is 
injurious to green plants when employed at concentrations 
which, in the case of cane sugar, fruit sugar, milk sugar, and 
malt sugar, would promote growth. 
Merrill, M. C. Ann. Mo. Bot. Gard. 2 459-506. In ex- 
perimental work on the relations of plants to nutrients and 
to deleterious agents it is necessary to grow control plants 
with the roots immersed in distilled water; but such control 
