As arum europaeum and its Mycorkiza, 775 
a deeply seated mycorhiza as in Asarmn . In cases of ectotrophic mycorhiza 
root-hairs may be absent altogether. 
In conclusion, my thanks are due to my sister, Miss Alice M. Schwartz, 
for her kind assistance with the drawings. 
Summary and Conclusions. 
1. The roots of Asarum europaeum are inhabited by a fungus which is 
limited to the cortical region abutting on to the steles of young roots. 
2. This fungus is very similar to those found in Thismia Aseroe and 
Neottia Nidus- avis. 
3. Thick-walled swellings are to be found on some of the hyphae, 
representing a resting stage of the fungus. These correspond with those on 
the fossil fungus on roots of Amyelon radicans. 
4. The fungus forms an endotrophic mycorhiza in most respects similar 
to those found in other roots. 
Bibliography. 
1. Groom, Percy (’94) : Contributions to the Knowledge of Monocotyledonous Saprophytes, 
Journal Linn. Soc., read Dec. 20, 1894. 
2. (’95) : On Thismia Aseroe and its Mycorhiza. Annals of Botany, vol. ix, 
No. xxxiv, June, 1895, p. 327. 
3. Magnus, Werner (’00) : Studien an der endotrophen Mykorrhiza von Neottia Nidus-avis. 
Jahrb. f. wiss. Bot., xxxv, 1900, p. 205. 
4. Stahl, E. (’00) : Der Sinn der Mykorrhizenbildung. Jahrb. f. wiss. Bot., 1900, p. 539. 
5. Weiss (’04) : A Mycorhiza from the Lower Coal-measures. Annals of Botany, vol. xviii, 
April, 1904. 
6. Ternetz, Charlotte (’04) : Assimilation des atmospharischen Stickstoffs durch einen torf- 
bewohnenden Pilz. Ber. d. Bot. Ges., xxii, 1904, p. 267 ; Jahrb. f. wiss. Bot., xliv, 1907, 
P. 353- 
7. Gallaud (’05) : Etudes sur les mycorhizes endotrophes. Rev. Gen. Bot., xvii, 1905. 
8. Osborn (’09) : Lateral Roots of A 7 tiyelon radicans and their Mycorhiza. Annals of Botany, 
vol. xxiii, October, 1909. 
