Taxon Details: Jimtrappea guyanensis T.W.Henkel, M.E.Sm. & Aime in M.E.Smith, Amses, T.F.Elliott, Obase, Aime & T.W.Henkel
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Narratives:
Family:
Boletaceae (Basidiomycota)
Boletaceae (Basidiomycota)
Scientific Name:
Jimtrappea guyanensis T.W.Henkel, M.E.Sm. & Aime in M.E.Smith, Amses, T.F.Elliott, Obase, Aime & T.W.Henkel
Jimtrappea guyanensis T.W.Henkel, M.E.Sm. & Aime in M.E.Smith, Amses, T.F.Elliott, Obase, Aime & T.W.Henkel
Primary Citation:
New sequestrate fungi from Guyana: Jimtrappea guyanensis gen. sp. nov., Castellanea pakaraimophila gen. sp. nov., and Costatisporus cyanescens gen. sp. nov. (Boletaceae, Boletales).
IMA Fungus 6: 305. 2015
New sequestrate fungi from Guyana: Jimtrappea guyanensis gen. sp. nov., Castellanea pakaraimophila gen. sp. nov., and Costatisporus cyanescens gen. sp. nov. (Boletaceae, Boletales).
IMA Fungus 6: 305. 2015
Accepted Name:
This name is currently accepted.
This name is currently accepted.
Description:
Diagnosis: Sequestrate, recalling Tylopilus with pinkish flesh colored gleba, smooth basidiospores, dextrinoid hymenial cystidia.
Macroscopic description: Basidiomata subglobose to ovate and irregularly lobed, occasionally appearing fused, (6–)11–21 mm tall, (3–)8–29 mm broad, subfirm to soft and gelatinous with age; surface off-white to pale cream (4A1–4A2, 5A2) throughout, unchanging with pressure or slightly browning, with occasional humic stains, glabrous macroscopically, under hand lens a tightly appressed hyphal mat; base subtended by delicate white hyphal cords and occasionally concolorous ectomycorrhizas. Peridium in longitudinal section extremely thin (less than 0.25 mm), light creamish white, single-layered, delicate, separable. Gleba nearly white (6A1) initially, with age light pink (6A2–6A3) to grayish pink (6B2–6B3), eventually variably darker pink (6C4–7C4, 7D5, 8B3–8B4), unchanging with exposure, moist, spongy, under hand lens of compact, folded locules that gelatinize with maturity; in longitudinal section columella a short basal structure 1–4 mm wide, off-white, gelatinous, opaque; upward-radiating sterile veins short (1–2 mm), less evident at maturity. Odor faintly fragrant, clay-like; taste slightly bitter, astringent. Macrochemical reactions not obtained.
Microscopic description: Peridium 94–200 µm thick, single-layered, of interwoven repent hyphae, these laterally branching, uninflated to inflated, 1–7 µm wide, occasionally swollen at septa, with irregular extracellular encrustations, granulose-guttulate, hyaline in KOH and H2O, interspersed with golden brown, opaque conductive hyphae; terminal cells cylindrocapitate, infrequently subventricose, or rarely cylindrical or with distinct angles, occasionally with short side branches, 7–81 µm long, 2–16 µm wide at apex, 2–7 µm centrally, 2–6 µm at base, with brownish yellow, densely granulose contents in KOH, and occasionally with globose, hyaline extracellular encrustations and swollen at the basal septum. Glebal trama hyaline, of tightly packed, parallel to slightly interwoven hyphae diverging toward hymenium; hyphae cylindrical, infrequently swollen at septa or branch points; cells 8–82 × 2–8 µm, hyaline in KOH, thin-walled, often heavily gelatinized and separating in mature specimens; contents not evident or sparsely guttulate-granulose; conductive hyphae frequent in subhymenial region, 2–7(–9) µm wide, golden-brown, opaque. Hymenium lining locules composed of a palisade of basidioles, basidia and cystidia arising from dichotomously branching subhymenial hyphae. Basidia abundant in younger specimens, increasingly rare to absent with age, subclavate to clavate, tapering evenly toward base, or rarely cylindrical, 23–50 µm long, 7–12 µm broad at apex, 6–9(–12) µm at center, (3–)4–6 µm at base, thin-walled, hyaline in KOH and H2O, unreactive in Melzer’s solution; contents not evident or opaque granulose-guttulate; guttules refractive, variably-sized, solitary to numerous; sterigmata two, three, or four per basidium, straight, even, 1.5–2 × 1–2 µm. Basidiospores statismosporic, smooth, subfusiform to fusiform, occasionally amygdaloid, bilaterally symmetrical in all views, (13–)14–18(–20) × 6–8 µm (mean = 16.0 ± 1.6 × 6.9 ± 0.6 µm; Qr = 1.88–2.83(–3.25), Qm = 2.34 ± 0.25; n = 120), initially light pinkish brown, more reddish brown at maturity in KOH and H2O, inamyloid; sterigma detaching irregularly from basidium and leaving a pedicel (0.5–)1–3.5(–5) µm long at basidiospore base; wall 0.3–0.9 µm thick, nearly smooth under light microscopy, under SEM surface of short, irregular layers. Cystidia abundant in young specimens, less frequent with maturation, arising from lower subhymenium, not projecting above hymenial palisade, cylindrical, sublanceolate, or subventricose, rarely cylindroclavate, (30–)34–72(–88) µm long, 5–9 µm broad at apex, 6–12 µm at center, 4–6(–8) µm at base, thin-walled, faintly gray and highly refractive in KOH and H2O, strongly dextrinoid in Melzer’s; contents initially granulose-guttulate, later a uniform, highly refractive cytoplasm, deliquescing into locules with advanced age. Clamp connections absent.
Registration number: MB812360
Ectomycorrhiza: Putatively associated with Dicymbe spp., and Pakaraimaea
Distribution: Guyana
Comments: Inferred from molecular phylogeny as a sister taxon to Durianella echinulata and that clade is sister to a clade of various species of Tylopilus, including the type species T. felleus. All this inference is without any statistical support. The taxon does clearly appear to belong to the Boletaceae.
Diagnosis: Sequestrate, recalling Tylopilus with pinkish flesh colored gleba, smooth basidiospores, dextrinoid hymenial cystidia.
Macroscopic description: Basidiomata subglobose to ovate and irregularly lobed, occasionally appearing fused, (6–)11–21 mm tall, (3–)8–29 mm broad, subfirm to soft and gelatinous with age; surface off-white to pale cream (4A1–4A2, 5A2) throughout, unchanging with pressure or slightly browning, with occasional humic stains, glabrous macroscopically, under hand lens a tightly appressed hyphal mat; base subtended by delicate white hyphal cords and occasionally concolorous ectomycorrhizas. Peridium in longitudinal section extremely thin (less than 0.25 mm), light creamish white, single-layered, delicate, separable. Gleba nearly white (6A1) initially, with age light pink (6A2–6A3) to grayish pink (6B2–6B3), eventually variably darker pink (6C4–7C4, 7D5, 8B3–8B4), unchanging with exposure, moist, spongy, under hand lens of compact, folded locules that gelatinize with maturity; in longitudinal section columella a short basal structure 1–4 mm wide, off-white, gelatinous, opaque; upward-radiating sterile veins short (1–2 mm), less evident at maturity. Odor faintly fragrant, clay-like; taste slightly bitter, astringent. Macrochemical reactions not obtained.
Microscopic description: Peridium 94–200 µm thick, single-layered, of interwoven repent hyphae, these laterally branching, uninflated to inflated, 1–7 µm wide, occasionally swollen at septa, with irregular extracellular encrustations, granulose-guttulate, hyaline in KOH and H2O, interspersed with golden brown, opaque conductive hyphae; terminal cells cylindrocapitate, infrequently subventricose, or rarely cylindrical or with distinct angles, occasionally with short side branches, 7–81 µm long, 2–16 µm wide at apex, 2–7 µm centrally, 2–6 µm at base, with brownish yellow, densely granulose contents in KOH, and occasionally with globose, hyaline extracellular encrustations and swollen at the basal septum. Glebal trama hyaline, of tightly packed, parallel to slightly interwoven hyphae diverging toward hymenium; hyphae cylindrical, infrequently swollen at septa or branch points; cells 8–82 × 2–8 µm, hyaline in KOH, thin-walled, often heavily gelatinized and separating in mature specimens; contents not evident or sparsely guttulate-granulose; conductive hyphae frequent in subhymenial region, 2–7(–9) µm wide, golden-brown, opaque. Hymenium lining locules composed of a palisade of basidioles, basidia and cystidia arising from dichotomously branching subhymenial hyphae. Basidia abundant in younger specimens, increasingly rare to absent with age, subclavate to clavate, tapering evenly toward base, or rarely cylindrical, 23–50 µm long, 7–12 µm broad at apex, 6–9(–12) µm at center, (3–)4–6 µm at base, thin-walled, hyaline in KOH and H2O, unreactive in Melzer’s solution; contents not evident or opaque granulose-guttulate; guttules refractive, variably-sized, solitary to numerous; sterigmata two, three, or four per basidium, straight, even, 1.5–2 × 1–2 µm. Basidiospores statismosporic, smooth, subfusiform to fusiform, occasionally amygdaloid, bilaterally symmetrical in all views, (13–)14–18(–20) × 6–8 µm (mean = 16.0 ± 1.6 × 6.9 ± 0.6 µm; Qr = 1.88–2.83(–3.25), Qm = 2.34 ± 0.25; n = 120), initially light pinkish brown, more reddish brown at maturity in KOH and H2O, inamyloid; sterigma detaching irregularly from basidium and leaving a pedicel (0.5–)1–3.5(–5) µm long at basidiospore base; wall 0.3–0.9 µm thick, nearly smooth under light microscopy, under SEM surface of short, irregular layers. Cystidia abundant in young specimens, less frequent with maturation, arising from lower subhymenium, not projecting above hymenial palisade, cylindrical, sublanceolate, or subventricose, rarely cylindroclavate, (30–)34–72(–88) µm long, 5–9 µm broad at apex, 6–12 µm at center, 4–6(–8) µm at base, thin-walled, faintly gray and highly refractive in KOH and H2O, strongly dextrinoid in Melzer’s; contents initially granulose-guttulate, later a uniform, highly refractive cytoplasm, deliquescing into locules with advanced age. Clamp connections absent.
Registration number: MB812360
Ectomycorrhiza: Putatively associated with Dicymbe spp., and Pakaraimaea
Distribution: Guyana
Comments: Inferred from molecular phylogeny as a sister taxon to Durianella echinulata and that clade is sister to a clade of various species of Tylopilus, including the type species T. felleus. All this inference is without any statistical support. The taxon does clearly appear to belong to the Boletaceae.