no idea what these are, need to get a book about mushrooms

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Garden centre

• 
  Mushroom Plugs Shiitake Mushrooms
  £6.95 at Suttons Seeds
• 
  Mushroom Grain Spawn (50g) Button Mushrooms
  £3.75 at Suttons Seeds
• 
  Mushroom Button Grain Spawn (100g)
  £4.95 at Suttons Seeds
• 
  Mushroom Plugs Oyster Mushrooms
  £6.95 at Suttons Seeds
• 
  Mushroom Straw Kits Oyster Mushrooms (1 Bag)
  £11.75 at Suttons Seeds