Dryopteris (various) Ferns

I have a number of Dryopteris ferns that are planted in a shady and dry area of the garden which I understood was OK conditions for them. However, given the lack of rain and heat we've had this summer, it appears that some of them have simply died. The crowns have gone soft and there is no obvious sign of life. Can I assume that they are completely dead? Is there any benefit in just leaving them in the ground to see if there is any new growth in the spring.
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I've a couple of Matteuccia struthiopteris ferns which always wither away during July leaving only their somewhat softish crowns to 'ride the storm' so to speak .
All the other ferns have got through though .
Yours may well be OK ; let's hope so !