33i 
Sources of Nitrogen in Plants . 
Woronin’s Mycorhiza was found on species of Salix and 
Populus , and on Conifers, Corylus , and a few other plants. 
Since Truffles ‘do not exist in Finland,’ the mycelium in 
question cannot belong to that fungus, but Woronin thinks 
it not improbable that a Boletus is here concerned. 
Woronin then goes on to remark that Kamienski had 
already discovered the symbiosis of which Frank makes so 
much, in 1882, in a work on Monotropa Hypopitys 1 , pointing 
out the same thing in Fagus sylvatica and the Coniferae, 
whence the priority belongs to this observer. 
The note by O. Penzig has reference to Frank’s remarks 
about Gibelli’s study of the chestnut-disease, and may be 
taken as admitting generally the possibility of Frank’s con- 
clusions, though protesting against some details which do not 
concern us at present. 
M. Reess also adds a few notes on the subject of Elapho - 
myces and other root-fungi 2 , and he too points out that 
Kamienski’s paper contains the germ of the matter. Reess 
states that the hyphae of Elaphomyces not only enter between 
the outer cortical cells of the pine-root, but drive the cell-wall 
before them as vesicles into the lumina. As regards common 
growth, distribution, occurrence, &c. of the mycelium on the 
roots, Reess states that the anatomical and other facts con- 
cerning Elaphomyces and pine-roots accord with Frank’s facts 
about the Mycorhiza of Cupuliferae. 
Reess also states that he has repeatedly seen fungus- 
envelopes on the roots of other plants as well as the pine. 
He has also investigated Kamienski’s fungus on Monotropa , 
and finds his observations in some points differing from 
those of that observer : he believes the Monotropa-tungus 
to be different from Elaphomyces , but cannot be sure. Reess 
admits that these and Frank’s root-fungi must take nutriment 
from the roots ; but regards the rest of the conclusions as 
needing much more careful investigation. 
The above criticisms are replied to by Frank in an article 
1 Mem. de la Soc. Nat. des Sc. Nat. et Math, de Cherbourg, T. xxiv. 
2 Ber. d. deutsch. bot. Gesellsch. 1885, p. 293. 
