Unknown Spider sp.

Unknown Spider sp.

Observation - Unknown Spider sp.. Description: We found this in a crevice in a Poplar in our garden, quite big, about 3-4cm in width. Hope someone could let us know what it is, thanks!

We found this in a crevice in a Poplar in our garden, quite big, about 3-4cm in width. Hope someone could let us know what it is, thanks!