Parasola

Parasola species on calcareous soil, apparently terrestrial but lot of organic litter within and above soil (broad leaved) accompanied by Acanthus mollis.

Without setae in the cuticle.

Gills not deliquescent

Cheilocystidia numerous, broadly utriform,

Spores wide, apple-shaped or wide ovate

Germpore wide

Spore size:

8.6 [9.6; 10.1] 11.1 x 7.8 [8.4; 8.7] 9.3 µm

Q = 1 [1.1; 1.2] 1.3; N = 27; C = 95%

Mean = 9.9 × 8.5 µm; Qe = 1.2

Spores too short for plicatilis, and hairs missing for auricoma - What about P. lactea ?

Thank you CF for your reply and tip. I can mount in 3% KOH later just for completeness. I was actually mounting the slide for cystidia (and basidia) and the spores were there 'as a bonus' where I photographed as well. First time I see this species and have experience with it. Unlike plicatilis, it did not open and became blackened when immature specimens were put in water ex-situ. Happy!

As promised here is a picture of the spores in KOH (4%). They are charcoal grey with a fine hint of brown.

I just read in a key* the following element :

Average length of basidiospores under 10.5–11 μm, Basidiospores often remain immature = P. lactea (= P. leiocephala)

* From: The genus Parasola : phylogeny and the description of three new species

János G. Szarkándi, Geert Schmidt-Stohn, Bálint Dima, Shah Hussain, Sándor Kocsubé, Tamás Papp, Csaba Vágvölgyi & László G. Nagy (2017)