Largent, Karstedt & Capelari & Baroni & Largent & Bergemann, 2019

Karstedt, Fernanda, Capelari, Marina, Baroni, Timothy J., Largent, David L. & Bergemann, Sarah E., 2019, Phylogenetic and morphological analyses of species of the Entolomataceae (Agaricales, Basidiomycota) with cuboid basidiospores, Phytotaxa 391 (1), pp. 1-27 : 20

Entoloma subgenus Cuboeccilia Karstedt, Capelari & Largent , subgen. nov. (MB 822178)

Etymology:—‘cubo’ referring to the cuboid shape of basidiospores and ‘eccilia’ to the genus Eccilia .

Type species:— Entoloma omphalinoides (Largent) Blanco-Dios, Tarrelos 17: 36. 2015. [≡ Leptonia omphalinoides Largent, Mycotaxon 125: 22. 2013.]

Description:— Basidiomata omphalinoid or collybioid. Pileus convex or plane, often umbilicate or with center depressed, surface glabrous to squamulose, hygrophanous. Pileus context thin. Lamellae decurrent, narrow, subdistant or distant, often greyish. Stipe cylindrical, longitudinally striate, slightly fibrillose, fibrous, hollow. Basidiospores cuboid without elongated angles. Basidia clavate, hyaline, thin-walled. Cheilocystidia and pleurocystidia present, abundant or dispersed (sparse), fusoid, fuso-ventricose, ventricose or ventricose-rostrate. Pseudocystidia absent. Lamellae trama composed of subparallel hyphae. Pileus trama composed of hyphae radially entangled. Pileipellis a trichoderm with transition to a cutis, with tangled and prostrate hyphae. Stipitipellis a cutis. Clamp connections present. Refractive hyphae absent or rare.

Distribution:— AUSTRALIA. ( Largent et al. 2013b – Leptonia omphalinoides ), PAPUA NEW GUINEA. ( Horak 1976 – Entoloma cf. infundibuliforme Petch (1917: 315)) and BRAZIL. ( Karstedt & Capelari 2015 – E. largentianum Karstedt & Capelari (2015: 70)) .

Distinctive characters:—Omphalinoid or collybioid basidiomata with umbilicate or depressed pileus, adnate, emarginate-decurrent or decurrent lamellae, cuboid basidiospores and fusoid cystidia.

Comments:—Historically, Cuboeccilia appears to comprise the species with cuboid basidiospores of Clitopiloidea (Romagn.) Largent ( Romagnesi & Gilles 1979, Noordeloos 1992, Largent 1994). Clitopiloidea is characterized by having a hygrophanous, smooth, glabrous, slightly to distinctly depressed to infundibuliform pileus, adnate to decurrent lamellae, a stipe that is fibrillose-striate and fusoid cystidia. However, Cuboeccilia differs from the description of Clitopiloidea which is described as having basidiospores cuboid to isodiametrical with 5 angles in profile view ( Largent 1994, Noordeloos 1992). The type species of Clitopiloidea , Entoloma cyathus ( Romagnesi & Gilles 1979: 617) Noordeloos & Co-David (in Co-David et al. 2009: 167), has four to six-angled basidiospores that are not cuboid ( Romagnesi & Gilles 1979), and therefore the name Clitopiloidea should not be applied to species with cuboid spores.

Entoloma subgenus Cuboeccilia is represented presently by three tropical species from different continents as indicated under distribution above, Leptonia omphalinoides , E. cf. infundibuliforme ( Horak 1976, ZTMyc42836, old number ZT72/487) and Entoloma largentianum . The morphological differences among these species can be found in Karstedt & Capelari (2015).