Leifiporia rhizomorpha
Leifiporia rhizomorpha Y.C. Dai, F. Wu & C.L. Zhao 2016, in Zhao et al., Mycological Progress, 15, 799-809 (2016)
Etymology: Rhizomorpha (Lat.): referring to the species bearing a rhizomorphic margin.
Diagnosis: Fruiting body. Basidiocarps annual, resupinate, soft, without odor or taste when fresh, brittle when dry, up to 20 cm long, 4 cm wide, 1.5 mm thick at center (measured in two hitherto available specimens). Pore surface white to cream when fresh, cream when dry; pores angular, 3–4 per mm; dissepiments thin, entire to slightly lacerate. Sterile margin distinctly rhizomorphic, white, up to 4 mm wide. Subiculum white, soft corky, up to 0.2 mm thick. Tubes concolorous with pore surface, brittle, up to 1.3 mm long. Hyphal structure. Hyphal system dimitic; generative hyphae hyaline, thin-walled, bearing clamp connections; skeletal hyphae present in the subiculum only, IKI–, CB–; tissues unchanged in KOH. Subiculum. Generative hyphae dominant, hyaline, thin-walled, frequently branched at right angles, interwoven, 2.5–4 μm in diameter; skeletal hyphae infrequent, hyaline, thick-walled with a narrow lumen or subsolid, occasionally branched, interwoven, distinctly thinner than generative hyphae, 1.5– 2.5 μm in diameter. Tubes. Generative hyphae hyaline, thin-walled, frequently branched at right angle, interwoven, 2–3.5 μm in diameter. Cystidia absent, but fusoid cystidioles occasionally present, hyaline, thin-walled, 11–13 × 5–6 μm; basidia barrel-shaped to pyriform, with four sterigmata and a basal clamp connection, 14–17 × 5.5–8 μm; basidioles dominant, in shape similar to basidia, but slightly smaller. Spores. Basidiospores mostly ellipsoid, hyaline, thin-walled, smooth, usually bearing one or two guttules, IKI–, CB–, (4.5–)5–6(−6 .5) × 2– 3 μm, L = 5.68 μm, W= 2.51 μm, Q = 2.15–2.38 (n = 60/2).
Index Fungorum Number: IF817363
Figure 1. Maximum Parsimony strict consensus tree illustrating the phylogeny of Leifiporia and related species in Polyporales based on ITS + nLSU sequences. Branches are labeled with maximum likelihood bootstrap higher than 70 %, parsimony bootstrap proportions higher than 50 % and Bayesian posterior probabilities more than 0.95, respectively. Clade names follow Binder et al. (2013)
Figure 2. Maximum Parsimony strict consensus tree illustrating the phylogeny of Leifiporia and related species obtained for more representative taxa in the Polyporaceae, based on the nLSU sequence datasets. Branches are labeled with maximum likelihood bootstrap higher than 70 %, parsimony bootstrap proportions higher than 50 % and Bayesian posterior probabilities more than 0.95 respectively. Clade names follow Binder et al. (2013).
Figure 3. Basidiomata of Leifiporia rhizomorpha. Bars: (A, B) 1 cm (holotype)
Figure 4. Microscopic structures of Leifiporia rhizomorpha (drawn from the holotype). a Basidiospores; b section of hymenium; c hyphae from trama; d hyphae from subiculum. Bars (a) 5 μm; (b–d) 10 μm
References:
Binder, M., Justo, A., Riley, R., Salamov, A., Lopez-Giraldez, F., Sjökvist, E., ... & Hibbett, D. S. (2013). Phylogenetic and phylogenomic overview of the Polyporales. Mycologia, 105(6), 1350-1373.
Zhao, C. L., Wu, F., & Dai, Y. C. (2016). Leifiporia rhizomorpha gen. et sp. nov. and L. eucalypti comb. nov. in Polyporaceae (Basidiomycota). Mycological Progress, 15, 799-809.
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