The base may be bulbous, or only swollen
(incrassated), and it may root in the ground.
[Illustration: Sections of gill bearing mushrooms.
Gills adnexed
Gills free
Gills adnate
Gills decurrent
Gills sinuous
Gills serrated
Pileus umbonate
Pileus umbilicate
Margin involute
Margin revolute]
THE GILLS.
The gills or lamellae are the radiating parts, like knife blades, that
extend from the centre to the margin underneath the cap. They contain
the spores. The group of mushrooms that have gills are called Agaracini
or Agarics. The gills vary in color; sometimes they change color when
mature. When they are close together they are called crowded, and when
far apart distant. There are often smaller gills between the others, and
sometimes they are two-forked (bifurcate), and are connected by veins.
They are narrow or wide, swell out in the middle (ventricose), are
curved like a bow (arcuate), and have a sudden wave or sinus in the edge
near the stem (sinuate).
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