How to distinguish between Lepista nuda and L. sordida

[MaxRum]

NUDA: not very distinctive, rather delicate, weakly flower like when fresh, slightly unpleasant when crushed.
SORDIDA: weak, often with aromatic component, sometimes more or less cyanidic or slightly rancid.

Is it sordida the flour-fungoid smell and nuda the aromatic ???

[MaxRum]

This is helpful:
Flora Georgia
Flora Agaricina

Spores: Obovoid, pole with apiculum more acute than other pole, verricose
(6.2) 6.5 - 7.1 (7.5) × (3.8) 4.2 - 4.9 (5)
Q = (1.3) 1.4 - 1.6 (1.7) ; N = 22
Me = 6.8 × 4.5, Qe = 1.5

[adampembs]

No, I mean what is the size of the mushroom?

[MaxRum]

The size is within the range of both, but admittingly in the median of nuda and higher end of sordida: cap 75mm across; height 42mm; stipe: 9mm; lamella 6.5mm wide.

[adampembs]

I think you are right with L. sordida. It's always hard with a single fruitbody, but the stem diameter is a better fit, along with the other characters. All of the L nuda I've seen has been much more robust. The only L. sordida I've found was noticeably smaller, so much so that I first thought it was Laccaria amethystina.

[MaxRum]

Thank you Adam - I am considering the smell as a good character too. The Maltese sordida are always a bit more robust than the norm. but maintaining the brownish tones of the pileus in wet conditions.