1 75 
Recent Work on Endotrophic Mycorhiza. 
to light. There is, for instance, that of Monotropa among Ericales. 
This plant has been investigated by more than one worker. The 
cytological facts are well-known, hut the physiological nature of the 
association between plant and fungus still awaits experimental 
investigation. 
Such a scheme as that outlined above is consistent with the 
view held by Bernard and by the writer of the present paper, 
namely:—that the phenomenon of mycorhiza in plants is only an 
expression of the warfare waged continually by all organisms 
against parasitic invasion of their tissues. The flowering plant 
possessing mycorhiza has done more than hold the invader in 
check ; it has turned the intrusion to its own advantage. 
BIBLIOGRAPHY. 
1. 
Bernard, Noel, 
1899. 
“ Sur la germination du Neottia nidus-avis." Comptes 
rend. CXXVIII, S. 1253-1255. 
2. 
a •• 
1900. 
“ Sur quelques germinations difficiles.” Rev. gen. 
Bot. XII, 108. 
3. 
a a 
1902. 
“ Etudes sur la tuberisation.” Rev. gen. Bot. 
XIV, pp. 5, &c. 
4 . 
a a 
i i 
“ Conditions physiques sur la tuberisatiou chez les 
vegetaux.” C. R. Acad. d. Sc., CXXXV, S. 
706-708. 
5. 
a a 
1904. 
“ Recherches experimentales sur les Orchidees.” 
Rev. gen. de Bot. 
6. 
a a 
i i 
“ Le champignon endophyte des Orchidees.” 
C. R. Acad. Sc., CXXXVIII, pp. 828-830. 
7 . 
a a 
1905. 
“ Nouvelles especes d'endophytes d’Orchidees.” 
C. R. Acad. Sc., CXL, pp. 1272-1273. 
8. 
it a 
1906. 
(a) “ Symbiose d’Orchidees et de divers Cham¬ 
pignons.” C. R. Acad. Sc., CXVII, pp. 52-54. 
9. 
a a 
1 1 
(b) “ Les champignons orchidees, leur role et leur 
utilisation.” 
10 . 
a a 
1908. 
“ La Culture des Orchidees dans ses rapports avec 
la Symbiose.” Gand, 1908. 
11 . 
a a 
1909. 
Ann. Sc. Nat. Bot., t. IX, No. 1, p. 1. 
12. 
a a 
i i 
Bulletin de 1’Institut Pasteur, No. 9. 
13. 
Burgeff, Hans. 
“ Die Wurzelpilze der Orchideen.” Jena, 1909. 
14. 
Rayner, M. Cheveley 
“ Obligate Symbiosis in Calluna vulgaris." Ann. 
Bot., Vol. XXIX, Jan., 1915. 
15. 
Gallaud, I. “ 
Etudes sur Ies mycorhizes endotrophes.” Rev. gen. de 
Bot., t. XVII, 1905, p. 5. 
16. 
Kusano. “ Gastrodia data and Armilleria mellea." Journ. of Agric., Tokio, 
Vol. IV, No. 1, 1911. 
University College, Reading. 
