How many grams is 1 tablespoon of sliced mushrooms?

1 tablespoon of sliced mushrooms (sliced white mushrooms) weighs

4.4g

That's 0.2oz. An Australian 20ml tablespoon holds 5.9g.

A level US or UK tablespoon (15ml). USDA doesn't measure a tablespoon of this, so this is a sixteenth of its cup weight.

Other amounts of sliced mushrooms

Where these numbers come from

USDA FoodData Central, SR Legacy, food 11260: “Mushrooms, white, raw”. USDA lists these household measures for it:

1 cup, pieces or slices = 70g
1 cup, whole = 96g
1 large = 23g
1 medium = 18g
1 slice = 6g
1 small = 10g
0.5 cup pieces = 35g

Fractions of a cup are the cup weight scaled down. The tablespoon figure is the cup weight divided by 16, since USDA doesn't list a tablespoon for this ingredient. The teaspoon is a third of the tablespoon. Metric-cup figures assume a 250ml cup, and Australian tablespoons hold 20ml. Weights under 10g are rounded to 0.1g, everything else to the nearest gram. Full source list.