Singerocomus rubriflavus T.W.Henkel & Husbands in T.W.Henkel, Obase, Husbands, Uehling, Bonito, Aime & M.E.Sm.

Filed As

Boletaceae
Singerocomus rubriflavus T.W.Henkel & Husbands in T.W.Henkel, Obase, Husbands, Uehling, Bonito, Aime & M.E.Sm. ( isotype )

Collector(s)

T. W. Henkel 9585, 01 Jan 2011

Location

Guyana. Cuyuni-Mazaruni. Region 7, Pakaraima Mountains, Upper Mazaruni River Basin, ~10 km west of Mt Ayanganna in vicinity of Pegaima savanna base camp.

Habitat

Rainforest. Pakaraimeae dipterocarpacea, Dicymbe jenmanii. Solitry. On humic mat.

Description

: Pileus 37–77 mm broad, 12–23 mm tall, broadly convex, dark red (10C8–10D8), areolate and brownish over central 1/3, contiguous matted tomentose and finely pitted toward margin, submoist; margin broadly wavy; trama 1–1.5 mm thick at margin, 3–5 mm over tubes, 9–14 mm above stipe, light yellow (2A3–2A4), unchanging with exposure, subsolid. Odor minimal, somewhat clay-like; taste mild. Tubes 1–3 mm long at margin, 4–7 mm centrally, 2–4 mm at stipe, of slightly irregular lengths, shallowly and broadly depressed and slightly sublamellate at stipe with decurrent teeth, olivaceous yellow (3A5–3B5), edges concolorous, darkening slightly with pressure; pores subangular, 1–1.5 per mm. Stipe 39–70 × 9–14 mm, equal, flaring outward slightly at apex to 12–17 mm, tapering slightly at extreme base, with light yellow (2A4–2A5) squamules on concolorous ground over apical 1/3, these transitioning to distinct, recurved brownish red (10D8) scales over concolorous or lighter ground over lower 2/3; basal mycelium a dense, dull yellowish brown (5D4–5E4) appressed tomentum over lower 1/4, extreme base white and somewhat radicating; trama white, yellowish beneath stipitipellis and in base, unchanging with exposure, very solid. Basidiospores olivaceous brown (5D4–5E4) in light deposit, 9–11(–12) × 4.5–6.5 µm, Q range 1.6–2.2(–2.6) (mean Q =1.94), subfusiform, smooth, with a prominent suprahilar depression, olivaceous brown in H2O, slightly paler in KOH, inamyloid, uni- to multiguttulate; hilar appendage 0.4–1 µm long; wall 0.4–0.5 µm thick; surface under SEM smooth. Basidia (27–)32–39.5 × 10–13.5(–15) µm, broadly clavate, tapering evenly and strongly toward with base, hyaline in H2O and KOH, devoid of refractive content or with greenish-yellow granules and globules in H2O; sterigmata 3–8 µm long, two, four, or rarely three per basidium. Pleurocystidia infrequent to scattered, (32–)37–64 × 10–15(–16) µm, ventricose to ventricose-rostrate, projecting 10–25 µm above the hymenial palisade, devoid of contents or with pale grayish cytoplasm in H2O, hyaline in KOH. Cheilocystidia infrequent, (24.5–)29.5–39(–44.5) × 7.5–10 µm, broadly ventricose-rostrate or occasionally narrowly obclavate, faint yellow-gray in KOH, projecting 7.5–24.5 µm above tube edge, devoid of cytoplasmic contents or with yellow-gray granules. Hymenophoral trama phylloporoid, subparallel to slightly diverging, in mass light yellowish gray in H20, paler in KOH; individual hyphae somewhat inflated, 3.5–12.5 µm wide, thin walled, hyaline, with uniformly faint gray cytoplasmic pigmentation, with faint transverse bands under phase contrast; mediostratum barely distinct, 7.5–17 µm wide, hyaline, non-gelatinizing; conductive hyphae absent. Pileipellis a trichodermium of loosely aggregated filiform hyphae projecting at various lengths, these occasionally with short side branches or nodules on terminal or penultimate cells, in mass pale orange-brown in H2O, pale yellowish gray in KOH; individual hyphae pale yellow in KOH, with minute, band-like incrustations on outer wall; terminal cells cylindrical, 29.5–62(–64) × 3.5–10 µm, pale yellow in KOH; subpellis hyphae interwoven, slightly inflated. Pileus trama interwoven, in mass faint orange-gray in H2O, pale yellow-gray in KOH; individual hyphae 5–10 µm wide. Stipitipellis hymenidermous, in mass olivaceous orange in H2O, olivaceous gray in KOH; sterile terminal cells ventricose-rostrate or clavate, occasionally cylindrical or obvate, 17.5–34.5(–44.5) × (5–)7.5–12.5(–15) µm, interspersed with numerous non-sporulating, narrowly clavate basidia with two, three, or four sterigmata in the grooves between squamules of the upper stipe, with varying degrees of cytoplasmic granules and globules; subpellis hyphae close-septate and inflated. Stipe trama densely interwoven, in mass orange-gray in H2O, faint yellow-gray in KOH; individual hyphae (3–)5–8.5 µm wide, irregularly branching and occasionally strangulated, hyaline, with minute, light orange-brown transverse incrusting bands; conductive hyphae absent. Clamp connections absent. Macrochemical reactions: 10% NH4OH slightly yellowing or unreactive on all surfaces; 3% KOH instantly yellowish brown on pileus, gradually yellowish brown on stipe and trama.

Specimen Notes

Duplicates in BRG, HSC

Identifiers

NY Barcode: 02425247

Occurrence ID: b57d9bee-58bf-4180-a919-da9647c3188b

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