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| Mycena cristinae J.S. Oliveira, in Oliveira, Vargas-Isla, Cabral, Cardoso, Andriolli, Rodrigues, Ikeda, Clement et Ishikawa, 2021. |
Abstract
A new luminescent lignicolous fungal species, Mycena cristinae sp. nov., is proposed from the Central Amazon forest. This is unique and supported by morphological evaluation along with LSU- and ITS-based phylogenetic analyses. The basidiomata have mostly fuscous olivaceous brown pileus, adnate to subdecurrent and distant lamellae, and stipe with slightly bulbous base (basal mycelium absent). It also has inamyloid and/or weakly amyloid basidiospores, ramose cheilocystidia and a pileipellis composed of an aerated tangle of slender, diverticulate hyphae forming a coralloid pellicle overlaying the hypodermium. The luminescence is evident in the basidiomata (especially the stipe) and in the mycelium on the substrate. The LSU phylogenetic trees reveal that M. cristinae is sister to M. coralliformis within the Mycenaceae clade. In the ITS trees, it forms a unique lineage grouping with undetermined Mycena taxa. Morphological data support M. cristinae as a different species compared to previously described taxa.
Keywords: Agaricales, Amazon forest, Mycenaceae, phylogeny, taxonomy
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| Macroscopic view of Mycena cristinae (J.S. Cardoso & F. Andriolli JS347, holotype -INPA 287129). A: basidiomata in situ, at night, using camera flash. B: basidiomata in situ, at night, without camera flash. C: basidiomata and mycelium on the substrate in situ, at night, without camera flash. D: pileus surface. E: hymenophore. F: stipe base. G: stipe base accompanied by fragment of the substrate with bryophytes. H: whole set of basidiomata. D-H photographed in lab using camera flash and room light. Bars: 10 mm. Photos: Francisco Farroñay (A-C); Julia S. Cardoso (D-H). |
Mycena cristinae J.S. Oliveira, sp. nov.
Diagnosis: Pileus 7–22 mm diam, striate-sulcate, grayish brown or fuscous olivaceous brown. Lamellae adnate to subdecurrent, 10–14. Stipe pale olivaceous, with slightly bulbous base without mycelium. Basidiomata and mycelium luminescent, with a green-yellow light. Basidiospores 6.7–8.7 × 4.7–6 µm, inamyloid or weakly amyloid. Cheilocystidia ramose. Pileus trama dextrinoid: 1) the hypodermium, upper layer of inflated, pale brown hyphae; 2) lower layer similar to the lamellar trama. Pileipellis a coralloid pellicle of slender hyphae overlaying the hypodermium. Lignicolous.
Jadson J.S. Oliveira, Ruby Vargas-Isla, Tiara S. Cabral, Julia S. Cardoso, Fernando S. Andriolli, Doriane P. Rodrigues, Takehide Ikeda, Charles R. Clement and Noemia K. Ishikawa. 2021. The Amazonian luminescent Mycena cristinae sp. nov. from Brazil. Mycoscience. 62(6); 395-405. DOI doi.org/10.47371/mycosci.2021.05.004
Researchgate.net/publication/354644984_The_Amazonian_luminescent_Mycena_cristinae_sp_nov_from_Brazil
