Kelley — x — Mycotrophy 



Included are the ectotrophic mycorrhizae which have mantle and 

 Hartig net. There is said to be resorption of nutrient salts. These 

 mycorrhizae are obligatory for many forest trees. With some species, 

 ectendotrophic forms are found. 



Selected chapters of the manuscript were read by Dr. G. R. Bisby, 

 of the Imperial Mycological Institute; by Dr. D. T. MacDougal; 

 by Dr. M. C. Rayner, of Bedford College ; and by Dr. H. E. Young, 

 Dept. of Agriculture and Stock, Queensland. None of these is 

 responsible for views expressed by the author. Above all, the author 

 is indebted to Dr. Frans Verdoorn, whose unflagging patience has 

 brought the book through difficult times. 



The Author 



Dr. J. A. HijNER of the Netherlands, who worked at the California 

 Institute of Technology, during 1948, just sent us a preliminary report 

 in which he claims, on the basis of experimental data, that vitamins 

 are essential for growth of Rhizoctonia isolated from Cymbidium; 

 specifically, folic acid or para-aminobenzoic acid with thiamin. He 

 considers that in nature these growth substances are suppHed by ger- 

 minating orchid seeds, which are known to contain them. He also 

 points out localization of fungi in tissues of the host which he believes 

 due to antibiotics produced by the host. 



Attention might still be drawn to the small symposium edited by L. 

 Blaringhem at the occasion of the Exposition Internationale, Paris 

 (1937) : — Symbiose et Parasitisme, I'oeuvre de Noel Bernard. 89 pp. 

 Paris : Masson. Other very recent publications which have not been 

 referred to in the book: — Bahme, R. B. (1949) : Nicotinic acid as a 

 growth factor for certain orchid embryos. Science 109 :522-3. — 

 Baumgartel, T. (1940) : Mikrobielle Symbiosen im Pflanzen- und 

 Tierreich. 132 pp. Braunschweig (Lithoprint ed. 1946. Ann Arbor, 

 Mich.: Edwards Bros.). — Kramer, P. J. & K. M. Wilbur (1949) : 

 Absorption of radioactive phosphorus by mycorrhizal roots of pine. 

 Science 110:8-9. — Magrou, J. (1943) : Des orchidees a la pomme de 

 terre. 203 pp. Paris. — Peyronel, B. (1939-40) : Luce, humus e mi- 

 corrizia. Atti d. R. Ace. Sc. di Torino 75:13 pp. — Schaede, R. 

 (1948) : Die pflanzlichen Symbiosen. ed. 2. 187 pp. Jena. 



