Chlorophyllum sect. Ellipsoidospororum

Falcão, Erica S., Ferretti-Cisneros, Nathalia U., Silva-Filho, Alexandre G. S., Koroiva, Ricardo & Wartchow, Felipe, 2025, Chlorophyllum tenue sp. nov. (Agaricaceae, Basidiomycota) from the Brazilian Caatinga semiarid region, European Journal of Taxonomy 976, pp. 182-193 : 189

Key for identification of the species of Chlorophyllum sect. Ellipsoidospororum ( Ge et al. 2018; Dutta et al. 2020; Loizides et al. 2020; this work)

1. Light brown to yellow-brown irregular patches on white to light orange pileus ............................. 2

– Furfuraceous squamules arranged on white to light grayish brown or dark cream pileus ............... 3

2. Basidia 2-spored; widely distributed (Africa, Asia and Americas) .... C. hortense (Murrill) Vellinga

– Basidia 4-spored; restricted to Southeast Asia................ C. demangei (Pat.) Z.W.Ge & Zhu L.Yang

3. Pileus with grey to grey orange furfuraceous squamules on white ground; stipe subcylindrical then slightly enlarged at base, white to light brown, turning brown to red where bruised or handled; annulus simple; cheilocystidia 28–50 × 6–10 µm; pileus covering formed by hymenidermic layer made up of clavate slightly thick-walled elements, with terminal elements mostly narrowly clavate ........................................................................................... C. africanum Z.W.Ge & A.Jacobs

– Pileus with reddish brown, light brown to rosy beige squamules on grayish brown to dark cream ground; stipe cylindrical-equal, radicant, not changing color when bruised, annulus upper central, double, thin, white to light brown, cheilocystidia 24–27.5 × 5.1–8.2 µm; pileus covering elements versiform (broadly clavate, clavate to slender clavate sinuous)............................... C. tenue sp. nov.