can you help me identify this mark?

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My mom bought a plate in Taiwan in the 1970's and this is on the bottoms of  blue and white ceramics , Thank you! I am new to this 

[peterp]

This is from the Qing dynasty. It has been made over a long time.
Could you upload some closeups of the front decoration (partial), showing the variations of blue clearly, and also one of the whole back, to show the details more clearly...?

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peterp thank you for your response : )

[peterp]

I cannot tell exactly when this was made. This design was made virtually throughout the Qing dynasty. I guess about mid-Qing. It depicts Lingzhi mushrooms.
The blue decoration, type of foot rim and this specific kind of mark mean it was made at Dehua kiln (Fujian province).

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peterp, thank you again!!! I cannot believe how much knowledge you have and are willing to share with me.