Neodictyopus atlanticae
Neodictyopus atlanticae Palacio, Robledo & Drechsler-Santos 2017 in Palacio et all., Plos one, 12(10), e0186183 (2017).
Etymology: atlanticae (Latin) Atlantic, referring to the species distribution, known to the Atlantic province.
Diagnosis: Basidiomata annual, laterally to eccentrically stipitate, tipically gregariuos, up to four basidiomata in 10 cm of wood; pileus reniform, up to 4.1 cm in diameter and 1.5 mm thick; pilear surface strong brown (7.5YR5/8) to dark reddish brown (2.5YR2.5/4), radially striate, glabrous; margin irregular, wavy and lobed. Pore surface brownish yellow (10YR6/8) to grayish brown (10YR5/2); pores circular 5−9 per mm, (80−)90−170(−180) μm (ave = 121.3 μm, n = 160/4); dissepiments entire to slightly lacerated, 20−90(−100) μm thick, (ave = 48.3 μm, n = 160/4). Tubes concolorous with the pore surface, not stratified, up to 0.5 mm long, decurrent and irregularly attached to the stipe. Context homogeneous, light brown (7.5YR6/4), up to 1 mm thick. Stipe cylindrical, solid, slender, glabrous, longitudinally striated, bearing a black cuticle, up to 2 cm long and 2 mm in diam. Hyphal system dimitic with generative hyphae and skeletal- binding hyphae. Generative hyphae with clamps, hyaline, thin-walled, 1−2.5 μm thick, IKI-, CB-, more easily observed in the tubes. Skeletal-binding hyphae hyaline to yellowish in KOH or water, nondextrinoid to occasionally weakly dextrinoid, CB-. Stipe, context and trama of the tubes composed mainly of skeletal-binding hyphae with a loose arboriform branching pattern (Figures 3B and 4D), up to 350 μm long, 2.5−5 μm wide, thick-walled, geniculated, with a short unbranched stalk (20−90 μm) and then with 2−5 branches (up to 550 μm long) with an alternating arrangement. Skeletal-binding hyphae in the trama (Figure 4E) shorter (80−150 μm) than those at stipe and context, becoming shorter (up to 90 μm) approaching the dissepiments with more (5−9) and shorter ramifications (Figures 3D and 6A). Cystidiole subulate, 14−20 × 4 −5 μm, with a basal clamp. Basidia clavate, 4-sterigmate, 19−21 × 5−6 um. Basidiospore cylindrical, thin-walled, hyaline, smooth, IKI−, CB−, (6.0−)6.5−8.0 × 2.0−3.0 μm, (ave = 6.3 × 2.1 μm), Q = 2−3.5, (ave = 3, n = 160/4).
Index Fungorum Number: IF819631
Notes: Neodictyopus atlanticae is well characterized by lateral to eccentrically stipitate basidiomata, well developed and slender stipe, reniform pileus with irregular, wavy and lobed margin, and the gregarious habit
Figure 1. Phylogenetic relationships of members of the Atroporus and Neodictyopus clades inferred from ITS, nucLSU, and RPB2 sequences. Topology from Bayesian Inference analysis. Bootstrap support values (before the slash markers) and Bayesian posterior probabilities (after the slash markers) are indicated. Red asterisks indicate the type species of the genus.
Figure 2. Basidiomata of Neodictyopus and Atroporus species. a. N. atlanticae (DS1284).a1. pores. b. N. dictyopus (GAS272). b1. pores and reticulated stipe. c. N. dictyopus type (Bertero 1683). d. N. gugliottae (GAS622). d1. pores. e. A. diabolicus (DS1266). e1. context and tubes. f. A. diabolicus type (NY 730627). f1. context and tubes. g. A. rufoatratus (LDA138). g1. pores. h. A. rufoatratus type (NY 730938). h1. pores. Scale bar: a, b, d-h = 1cm; c = 2 cm; a1-f1 = 2 mm; g1, h1 = 1 mm.
Figure 3. Comparison of microscopical features of Atroporus and Neodictyopus. Photos of: a. context hyphae of A. diabolicus (DS1266). b. context hyphae of N. atlanticae (DS1284). c. tramal hyphae A. diabolicus (DS1266). c.1 tramal hyphae A. rufoatratus (LDA138). d. tramal hyphae of N. atlanticae (DS1284). e. basidiospores of A. diabolicus (DS1266). f. basidiospores of A. rufoatratus (MP153). g. basidiospores of N. gugliottae (GAS622). h. basidiospores of N. atlanticae (FB351). Scale black bar = 1 μm.
Figure 4. Comparison of microscopical features of Atroporus and Neodictyopus. Schematic drawings of: a. context hyphae of A. diabolicus (DS1266). b. tramal hyphae A. diabolicus (DS1266). c1 basidiospores of A. diabolicus (DS1266). c2 basidiospores of A. rufoatratus (MP153). d. context hyphae of N. atlanticae (DS1284). e. tramal hyphae of N. atlanticae (DS1284). Basidiospores of f1. N. dictyopus (GAS281), f2. (BPI US207664, type of N. dictyopus). f3 N. gugliottae (GAS622). f4 N. atlanticae (FB351). Scale black bar = 10 μm.
Figure 5. Potential geographic distribution of Atroporus and Neodictyopus species based on biogeographical regionalization of Morronem 2014. A. A. diabolicus (Atlantic, ImerõÂ, and Xingu-TapajoÂs provinces). B. A. rufoatratus (Atlantic, ImerõÂ, Pantepui, and Parana Forest provinces). C. N. gugliottae (Araucaria and Parana provinces). D. N. dictyopus (Cerrado province and Juan Fernandez archipelago). E. N. atlanticae (Atlantic province).
Figure 6. Microscopical features of Neodictyopus atlanticae. a. tramal hyphae (DS1284). b. cylindrical basidiospores (FB351). Ø = clamp scar. Scale bars = 10 μm.
Reference:
Palacio, M., Robledo, G. L., Reck, M. A., Grassi, E., Góes-Neto, A., & Drechsler-Santos, E. R. (2017). Decrypting the Polyporus dictyopus complex: Recovery of Atroporus Ryvarden and segregation of Neodictyopus gen. nov. (Polyporales, Basidiomyocta). Plos one, 12(10), e0186183.
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