Fungalpedia – Note 3070, Vizzinia
Vizzinia Ševčíková & Kolařík.
Citation when using this data: Senanayake IC et al. 2023 – Fungalpedia.
Index Fungorum, Faceoffungi, MycoBank, GenBank.
Classification: Incertae sedis, Incertae sedis, Agaricomycetidae, Agaricomycetes, Agaricomycotina, Basidiomycota, Fungi.
Etymology: in honor of the mycologist Alfredo Vizzini for his excellent contribution to mycology.
Diagnosis: Genus Vizzinia (see below) differs from Marasmiellomycena by basidiomata turning brownish on handling, distinctly squamulose pileus, floccose or floccose-fibrillose stipe, weakly amyloid spores, and absence of cheilocystidia (Consiglio et al. 2021).
Basidiomata strongly omphalinoid to omphalinoid-clitocyboid-marasmioid. Pileus small, squamulose, translucently radially striate-furrowed. Lamellae often whitish, thick, distant, intervenose, adnate-decurrent to long-decurrent, with lamellulae of various length. Stipe cylindrical, fistulous, covered with floccose fibrils, often darker on the lower part, strigose at the lowest part of the base. Context thin, turning brownish on handling. Odour non-distinctive. Basidiospores colourless, thin-walled, smooth, congophilic, cyanophilic, weakly amyloid. Basidia slightly amyloid at apex. Hymenial cystidia absent. Subhymenium filamentous, consisting of intertwined short elements. Hymenophoral trama metachromatic. Pileipellis a cutis with frequent or rare pileocystidiod elements. Caulocystidia present. Thromboplerous hyphae and clamp connections present.
Notes: The genus Vizzinia contains two species viz. V. dominingense and V. nigripes and it forms a well-supported lineage clearly represents a new genus. This genus matches optimal thresholds well at the genus level according to Vu et al. (2018); which is 98.2% based on LSU barcodes and 94.3% based on ITS barcodes. The closest matches with NCBI was P. fimbriatum with 96.64–96.37% (Vizzinia nigripes type) and 97.59%–97.36% (V. domingense type) based on LSU; P. omphaliiforme reference species with 84.28% (V. nigripes type) and 90.19% (V. domingense type) based on ITS. Consiglio et al. (2022) mentioned that “these groups of species will probably be considered as independent genera, especially the albodescendens/omphaliiforme and domingense/nigripes pairs”. In spite of these claims, they preferred to describe these species as Porotheleum domingense and P. nigripes. We could not avoid solving this new genus, if we want to justify the existence of the genus Marasmiellomycena and we believe that our new species M. pseudoomphaliiformis makes clear enough the relationship between omphaliiforme and domingense/nigripes lineages.
Type species: Vizzinia nigripes (Angelini, Vizzini, Consiglio & M. Marchetti) Ševčíková & Kolařík.
Other accepted species: Species Fungorum – search Vizzinia.
References
Entry by
Indunil C. Senanayake, Innovative Institute for Plant Health/ Key Laboratory of Green Prevention and Control on Fruits and Vegetables in South China, Ministry of Agriculture and Rural Affairs, Zhongkai University of Agriculture and Engineering, Haizhu District, Guangzhou 510225, Guangdong, China., Center of Excellence in Fungal Research, Mae Fah Luang University, Chiang Rai 57100, Thailand., Guangdong Provincial Key Laboratory for Plant Epigenetics, College of Life Science and Oceanography, Shenzhen University, 3688, Nanhai Avenue, Nanshan, Shenzhen, Guangdong 518055, China., University of L’Aquila, Department MeSVA, sect. Environmental Sciences, Via Vetoio, 67100 Coppito (AQ), Italy.
Published online 31 August 2026