Rickenella fibula Raithelh., Metrodiana
Creators: name: Funez, Luís Adriano
name: Monteiro, Marcela
name: Costa-Rezende, Diogo Henrique
name: Alves-Silva, Genivaldo
name: Drechsler-Santos, Elisandro Ricardo
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Fungi
Basidiomycota
Agaricomycetes
Cantharellales
Cantharellaceae
Rickenella
Rickenella fibula

description: Rickenella fibula (Bull.) Raithelh., Metrodiana 4: 67.1973.
(Figs. 2-3)
Macroscopic characters: Basidiomata small, omphalinoid. Pileus 3–4 mm diameter, hemispheric at first, becoming convex to nearly plane with a shallow central depression and slightly wavy margin in age; surface dry to hygrophanous, glabrous to the naked eye and finely pubescent under a lens, yellowish orange to orange, deep orange to brownish at the central depression. Lamellae 18–20, decurrent to deeply decurrent, furcate or transvenose, white to yellowish white, up to 2 mm wide; lamellulae 1–2 of different lengths between the two complete lamellae, edge entire, concolorous, intervenose, not to occasionally forked. Stipe central, 12–15 × 0.2–0.5 mm, cylindrical to subcylindrical, often curved, equal or slightly tapered downwards and upwards, cartilaginous, solid, white to yellowish white, somewhat translucent; surface covered with finely pubescent; basal mycelia white. Odor and taste not distinctive. Microscopic characters: Basidiospores (4.8–)5.0–6.7 × (1.6–)2.0–2.8(– 3.0) μm, Q = (1.43–)1.51–1.82(–2.0), Qm = 2.3 ± 0.7, ellipsoid, thin-walled, hyaline, smooth, inamyloid. Basidia 14.5–20 × 3.6–4.3 μm, clavate, 4-spored, thin-walled; sterigmata 3.6–4 μm, often clamp connections at the base of the basidia. Pleurocystidia 36.5–51.1 × 5.2–8.4 μm, narrowly lageniform to subcapitate, often with subcapitate apex, hyaline, thin-walled, inamyloid. Cheilocystidia similar to pleurocystidia in shape and size. Lamella trama regular to subregular, hyphae 8.5–17.7 μm wide, cylindrical or subfusoid, thin-walled, hyaline, inamyloid. Pileus trama subregular, hyphae 3–12 μm wide, thin-walled, hyaline, inamyloid. Pileipellis as a cutis with scattered pileocystidia, hyphae 3–12 μm wide, cylindrical or subfusoid, thin-walled, hyaline. Pileocystidia similar to pleurocystidia in shape and size. Stipitipellis a cutis with scattered caulocystidia, hyphae 3–11 μm wide, with cylindrical elements, hyaline, thin-walled. Caulocystidia similar to pleurocystidia in shape and size. Clamp connections present.
Specimens examined: BRAZIL, SANTA CATARINA, Grão Pará, Serra do Corvo Branco, 17.III.2020, L.A. Funez & W.I. Ribeiro-Nardes 8951 (FLOR); Urubici, Parque Nacional de São Joaquim, 01. V.2019, D.H. Costa-Rezende, L.A. Funez & M. Monteiro 584 (FLOR); Estrada geral da Santa Bárbara, 02. V.2019, L.A. Funez, M. Monteiro & D.H. Costa-Rezende 8948 (FLOR); 8949 (FLOR); 19.IX.2019, L.A. Funez, W.I. Ribeiro-Nardes & M. Comin 9097 (FLOR); 26.III.2019, L.A. Funez, T. Kossmann, D.H. Costa-Rezende & D.K.S Guimarães 9155 (FLOR); 30.I.2020, L.A. Funez, W.I. Ribeiro-Nardes & M. Comin 9422 (FLOR); 28°9’38’’S, 49°37’5’’W, 21. V.2019, F. Bittencourt, L.A. Funez & D.H. Costa-Rezende 1278 (FLOR).
description: Published as part of Funez, Luís Adriano, Monteiro, Marcela, Costa-Rezende, Diogo Henrique, Alves-Silva, Genivaldo & Drechsler-Santos, Elisandro Ricardo, 2023, Rickenella fibuLA (Repetobasidiaceae: Basidiomycota): a tiny species with large distribution also occurs in Brazil, pp. 1-10 in Iheringia, Série Botânica (e 2023008) (e 2023008) 78 on pages 4-6, DOI: 10.21826/2446-82312023v78e2023008, http://zenodo.org/record/10987668