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 Add this item to the list  Mycena luxaeterna
    

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 Summary:Mycena luxaeterna Desjardin, B.A. Perry & Stevani, Mycologia 102 (2): 463 (2010) [MB#515160] 
 MycoBank #:515160 
 Epithet:luxaeterna 
 Rank:
 
 Authors:Desjardin, B.A. Perry & Stevani 
 Authors (abbreviated):Desjardin, B.A. Perry & Stevani 
 Literature:
 
 Page #:463 
 Year of effective publication:2010 
 Gender:Feminine 
 Date public:2010-04-13 08:59:01 
 Remarks:Distinctive features of Mycena luxaeterna include: a small, plano-convex, umbilicate, viscid, greyish brown to greyish yellow pileus; subdecurrent, pallid lamellae that develop orange-resinous edges when dried; a translucent, white, thickly gelatinous stipe that strongly emits yellowish green light when observed in the dark; a lignicolous habit on small sticks; strongly amyloid, moderately-sized basidiospores; narrowly fusoid, obtuse cheilocystidia and a lack of pleurocystidia; non-gelatinous subhymenium; a thick ixotrichodermium pileipellis with diverticulate terminal cells that is not readily separable when fresh; no differentiated hypodermium; strongly dextrinoid tramal tissues; a thin ixocutis stipitipellis embedded in a thick gelatinous matrix that is not readily separable when fresh; and caulocystidia similar in morphology to the cheilocystidia and the pileipellis terminal cells.
In the field, M. luxaeterna is strongly reminiscent of Roridomyces (Mycena) roridus (Scop.) Rexer; however, the hymeniform pileipellis of the latter removes Roridomyces from consideration. The thick ixotrichodermium-type pileipellis of M. luxaeterna is very similar to those of members of sect. Hygrocyboideae (Fr.) Sing. (e.g., M. epipterygia (Scop.:Fr.) S.F. Gray and allies). In the latter species, however, the pileipellis is readily separable, and the lamellae edges are separable as an elastic thread formed from clavate, apically diverticulate cheilocystidia embedded in a gelatinous matrix. If one overlooks the thick ixotrichodermium pileipellis and thick layer of gelatin on the stipe surface, M. luxaeterna shares many similarities with members of sect. Insignes Maas. Geest., such as M. pseudoclavicularis A.H. Sm. from Oregon, and M. roriduliformis (Murr.) Dennis from Jamaica. Mycena pseudoclavicularis differs in forming a lubricous (not gelatinous) stipe with densely diverticulate cortical hyphae, larger basidiospores (8.1–9.8 × 4.5–5.6 µm), broader cheilocystidia (6.5–10 µm), has pleurocystidia, and grows on debris of yellow pines (Maas Geesteranus 1992). Mycena roriduliformis differs in forming a lubricous (not gelatinous) stipe, smaller basidiospores (4.5–4.9 × 2.5–3.0 µm), fusiform to subclavate cheilocystidia 7–17 µm diam that are often apically lobed, and a cutis-type pileipellis (Maas Geesteranus 1992). Lastly, M. luxaeterna shares many features with members of sect. Euspeireae Maas Geest., although M. luxaeterna lacks a gelatinous subhymenium, lacks pleurocystidia, and lacks separable pileus and stipe pellicles. Within sect. Euspeireae, the most phenetically similar species is M. euspeirea (Berk. & M.A. Curtis) Sacc. known currently from Cuba, British Honduras and Venezuela. Mycena euspeirea differs in having a pileus and stipe with separable pellicles, smaller basidiospores (5.8–6.1 × 2.7–2.9 µm), broader cheilocystidia (9–10 µm), distinct pleurocystidia, a gelatinous subhymenium, and smooth pileipellis hyphae (Maas Geesteranus 1992). Four new species belonging to sects. Insignes (viz., M. conspersa Maas Geest. & de Meijer, M. demissa Maas Geest. & de Meijer, M. surculosa Maas Geest. & de Meijer ) and Euspeireae (M. tapeina Maas Geest. & de Meijer) were recently described from the southern state of Paraná, adjacent to São Paulo State (Maas Geesteranus and de Meijer1997). All four of these species differ from M. luxaeterna in pileipellis and stipitipellis anatomy, cheilocystidia shape, basidiospore size, and lamellar spacing. None of the above mentioned species that are phenetically similar to M. luxaeterna have been reported as luminescent. Because M. luxaeterna shares features with members of sects. Hygrocyboideae, Insignes and Euspeireae, placement in any currently accepted infrageneric taxon is problematical. Multiple gene sequences should help clarify this issue (to be published elsewhere).
 
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