Minimum size

• The minimum cap diameter must be at least 15 mm for closed cap, veiled and open mushrooms and 20 mm for flat mushrooms.

Length of stalk

• The length of the stalk is measured:
  • from the veil for closed and veiled mushrooms.
  • from the gills under the cap for open and flat mushrooms.
• Sizing is compulsory for mushrooms in “Extra” Class according to following table:
• Mushrooms of Classes I and II must meet the specified size ranges if the terms “small”, “medium” or “large” are indicated.

• Closed, veiled and open mushrooms
  Diameter of cap		Maximum length of stalk
  Size	Size limits	Cut mushrooms	Uncut mushrooms
  Small	15 – 45 mm	1/2 of cap diameter	2/3 of cap diameter
  Medium	30 – 65 mm
  Large	50 mm and over

• Flat mushrooms
  Diameter of cap		Maximum length of stalk
  Size	Size limits	Cut mushrooms	Uncut mushrooms
  Small	20 – 55 mm	2/3 of cap diameter
  Large	50 mm and over