By assigning the 10c "satinado" - both Solari and GJ - they forget that all these stamp were printed on COATED paper and had some varnish added to the print later. To a rather small extent, though, so that explains the "semi mate".
I will not go into the matter of luminescence here, as it is a continuum of OBA's in the paper pulp AND the coating denoted by FF, Ff, fF and ff whereas the first is the front and the second the back; "f ' is less white than "F"!
It is VERY STRANGE that Solari has made this distinction only for the Fungi series as the 3 Flowers sets have different fronts as to OBA as well! At least ff and FF should have been used there!
The first 3 stamps have the same type of pockmarked surface. Not round holes but irregular shapes in a high frequency! The Flowers have this type of paper too, but usually to a lesser extent.
The second 50c stamp is "normaL"
rc2493