“…response of Lentinus omphalodes to tlie tbree 3-indolecarboxylic acids was different in every ca.se, if tlie higher concentrations, 100 [i.m per flask, were considered (tbe lower coiicenlrations were all inactive). 3-Indoleacetic acid was distinctly inhibiting, wbich could be expected from earlier experiences of various workers (Leonian & Lilly t937, Murdia 1939, Bhargava 1946, Richards 1949). 3-IndoIepropionic acid was quite neutral, while 3-indoIe nbulyric acid evidently promoted growth.…”