Parasola Redhead, Vilgalys & Hopple

Zhu, LiYang & Bau, Tolgor, 2025, Emendation of morphology and infrageneric standards of Parasola (Psathyrellaceae, Agaricales) and its species diversity in China, IMA Fungus 16, pp. e 143796-e 143796 : e143796-

Parasola Redhead, Vilgalys & Hopple

Description.

Basidiomata small to medium-sized, most terrestrial, sometimes fimicolous or lignicolous. Pileus radially sulcate or almost glabrous, veil absent, sometimes with brown hair, center with depressing disc or not. Lamellae adnate or free, withering or partial deliquescent at age. Stipes hollow, most glabrous. Basidiospores flattened or not, subglobose, ellipsoid, ovoid, rounded subtriangular, rhombic, subpentangular, hexagonal in front view, ellipsoid or lentiform in side view, germ pore central or eccentric. Basidia monomorphic or dimorphic, usually 4 - spored, occasionally 2 - spored. Lamellae trama regular, colorless or in brown hue. Lamellae margin infertile, cheilocystidia abundant, subglobose, utriform, ellipsoid, sublageniform or subcylindrical. Pleurocystidia are mainly present, subglobose, utriform, sublageniform or subcylindrical. Original pileipellis a hymeniform, secondary pileipellis is a subcutis when present. Caulocystidia is only present at the upper part of stipes. Clamps present and sometimes present pseudoclamps.

Two sections in Parasola are inferred based on molecular data, scoring of macro- and micro-morphological traits (Fig. 5 ). Macromorphologically, consistent characters supporting the two sections include the pileus shape and the lamellae-stipe attachment type, while micromorphologically diagnostic features encompass the presence or absence of secondary pileipillis, and the basidia morphological type.

Figures

Figure 5. Selected morphological characteristics and ecological information of species in Parasola were mapped with the consensus tree of three-locus dataset (ITS + LSU + tef 1 - α) conducted by one representative collection for each species. Species in sect. Conopileae, transitional taxa and typical taxa of sect. Parasola were enclosed in blue, green and yellow frames respectively. Features of species were given under the consensus tree. Uncertain state for a taxon was given as “ - ”, other abbreviations were presented and explained