Guyanaporus albipodus T.W.Henkel & Husbands in T.W.Henkel, Obase, Husbands, Uehling, Bonito, Aime & M.E.Smith

Filed As

Boletaceae
Guyanaporus albipodus T.W.Henkel & Husbands in T.W.Henkel, Obase, Husbands, Uehling, Bonito, Aime & M.E.Smith ( isotype )

Collector(s)

T. W. Henkel 8848, 07 Jun 2005

Location

Guyana. Potaro-Siparuni. Region 8, Pakaraima Mountains, Upper Potaro River Basin, within 5 km radius of Potaro base camp, vicinity of base camp.

Habitat

Rainforest. Dicymbe corymbosa. Solitary to scattered. On humic mat.

Description

Pileus 34–75 mm broad, (7–)15–21 mm tall, convex to planate to strongly upturned with age, grayish brown (6F4–6F5, 7F3–7F4), glabrous macroscopically, under hand lens dense contiguous low tomentum, with age minutely areolate over marginal 1/3 revealing whitish ground; dry to submoist; margin slightly incurved and undulating when young, otherwise entire; trama 1–2 mm thick at margin, 6–11 mm above tubes, 9–10 mm above stipe, white to very pale yellow (2A2), bluing slightly and slowly with exposure, solid. Odor mild to somewhat rank, farinaceous; taste mild, indistinctive. Tubes 1–3 mm long at margin, 2–5 mm centrally, 2–4 mm at stipe, of slightly irregular heights when mature, shallowly and narrowly depressed around stipe and there slightly sublamellate and with short decurrent teeth descending into upper stipe reticulum, initially pale grayish yellow (2B4–3B4), darker concolorous (3B5–3B6) when mature, bluing instantly upon exposure, tube edges concolorous, bluing slowly and moderately with pressure, this eventually browning; pores initially convoluted, substuffed, then subisodiametric to ovate and subangular, 2–3 per mm. Stipe (47–)60–97 × 7–20 mm centrally, equal but broadening to 14–25 mm at base due to dense basal mycelium, grayish brown (6F3–6F4), pale yellow (3A2–3A3) at extreme apex, longitudinally striate over lower ¾ with lighter ground between striations; striations merging upward into distinct reticulum over upper 1/4; basal mycelium a dense white tomentum, occasionally yellowish orange with age, surrounding the basal 1/5 of the stipe length; trama white, unchanging, yellowing around larval channels, solid. Basidiospores olive to brownish olive (4D4–5D4, 4D7–4E7) in medium deposit, (6–)7–8(–9) × 4–5 µm, Q range 1.4–1.9 (mean Q = 1.68), ovoid-ellipsoid with suprahilar depression, pale olivaceous in H2O, concolorous but lighter in KOH, inamyloid, smooth, mostly 1–2 guttulate; hilar appendage 0.3–0.4 µm long; wall 0.4–0.5 µm thick; surface under SEM smooth. Basidia (20–)25–37.1(–45) × (6–)7.5– 10(–12) µm, narrowly to occasionally broadly clavate, strongly tapering toward base, devoid of refractive content or with varying degrees of olivaceous brown granulation and globules in H2O, paler in KOH; sterigmata 3–6 µm long, two or four per basidium. Pleurocystidia infrequent, (27–)37–57(–79) × (5–)7.5–10(–14)µm, narrowly ventricose-rostrate to occasionally sublanceolate, projecting (10–)12.5–27 µm above the hymenial palisade, devoid of refractive contents, hyaline in H2O and KOH. Cheilocystidia absent. Hymenophoral trama phylloporoid, parallel to slightly diverging, non-gelatinizing, in mass light yellow-gray in H2O, paler in KOH; individual hyphae somewhat inflated, 5–10(–12.5) µm wide, hyaline to faint gray in H2O and KOH; mediostratum barely distinct, concolorous, 10–39.5 µm wide; conductive hyphae rare, opaque and hyaline. Pileipellis a trichodermial palisade with terminal elements projecting at slightly unequal lengths, in mass pale gray or light orangish yellow in H2O, paler in KOH; individual hyphae faint yellow in KOH; terminal elements (25–)37–66.5(–87) × (5–)8.5–15(–20) µm, cylindrical, clavate, ventricose, or ventricose-rostrate; subpellis hyphae anticlinally arranged, close-septate, variably inflated. Pileus trama interwoven; hyphae (3.5–)5–10(–12.5) µm wide, hyaline in H2O and KOH, somewhat inflating, devoid of contents or minutely granulose. Stipitipellis a trichodermial palisade, in mass olivaceous orange in H2O, olivaceous gray in KOH; sterile terminal cells cylindrical, clavate, mucronate, ventricose, or ventricose-rostrate, 22–39.5 × (5–)7.5–10 µm, hymenidermous in grooves between apical stipe reticulations with numerous two- or four-sterigmate basidia, these apparently non-sporulating, 34.5–37 × 7.5– 10 µm, narrowly clavate with long tapered base; contents variously granulose-guttulate. Stipe trama interwoven, in mass orangish gray in H2O, paler yellow-gray in KOH; individual hyphae 3.5–10 µm wide, somewhat inflating, irregularly branching, hyaline; conductive hyphae rare, opaque, faintly yellow. Clamp connections absent. Macrochemical reactions: 10% NH4OH and 3% KOH not reactive on all surfaces.

Identifiers

NY Barcode: 02425245

Occurrence ID: f651a490-c59c-40ce-989d-0909215273b4

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