Agaricus bisporus, strain Al, needed 20 to 25 days to give the
maximum yield in shaken flasks (see Fig. 6). With Coprinus comatus,
strain L, the maximum was reached earlier and the yield was three to
four times as high as with Agaricus bisporus. Unless stated otherwise, our
shaken cultures of Agaricus bisporus were harvested after 21 days, and
those of Coprinus comatus after 14 days. Both organisms were thus
harvested near the end of the phase of rapid growth.