Taxon Details: Castellanea pakaraimophila T.W.Henkel & M.E.Sm. 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:
Castellanea pakaraimophila T.W.Henkel & M.E.Sm. in M.E.Smith, Amses, T.F.Elliott, Obase, Aime & T.W.Henkel
Castellanea pakaraimophila T.W.Henkel & M.E.Sm. 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: 310. 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: 310. 2015
Accepted Name:
This name is currently accepted.
This name is currently accepted.
Description:
Diagnosis: Basidiomata sequestrate, with a short stipe, orange brown peridium, brown, loculate gleba, with a short columella arising from a sterile pad, with smooth subfusoid basidisopores that are frequently dextrinoid and released in tetrads, lacking clamp connections and hymenial cystidia.
Macroscopic description: Basidiomata irregularly flattened-ovate, 7–12 mm tall, 12–16 mm broad, subfirm, softer with age; surface light grayish orange (5A5–5B5–5B6) to orangish brown (7C8–7D8–7E8) with occasional darker humic stains, unchanging with pressure, glabrous macroscopically, under hand lens a dense repent mat of light orange hyphae, with age viscid to nearly glutinous; base subtended by a short, concolorous stipe, this 1.5 × 1.5 mm, with a single concolorous hyphal cord. Peridium in longitudinal section extremely thin over apical ¾ (less than 0.25 mm), concolorous with surface, over basal ¼ thickening to 0.75 mm and there off-white, single-layered, separable. Gleba dark brown (6E7–6F7, 7E7–7F7) throughout, unchanging with exposure, of irregularly shaped locules with interior surfaces minutely brownish hispid under hand lens; locule walls translucent-gelatinous; columella arising from the thickened basal peridium, with a single narrow gelatinous vein extending to apex. Odor slightly of iodine; taste not obtained. Macrochemical reactions not obtained.
Microscopic description: Peridium 25–190 µm thick, single-layered, of tightly interwoven, repent hyphae, yellowish brown in KOH and H2O, becoming more parallel and hyaline toward gleba; individual hyphae 2–5 µm wide, thin-walled; terminal cells cylindrical to subcapitate, 19–36 × 2–3 µm. Glebal trama with a distinct mediostratum and lateral stratum; mediostratum hyaline in H2O and KOH, 12.4–29.6 µm wide, of parallel, slightly interwoven hyphae; individual hyphae 2–8 µm wide; lateral stratum divergent at a right angle from mediostratum, hyaline in H2O and KOH, grading imperceptibly into the densely interwoven subhymenium. Hymenium a palisade of tightly packed basidia and basidioles. Basidia faintly gray in H2O and KOH, changing in shape with maturity; in developing basidiomata (e.g. Henkel 9670) subclavate, infrequently cylindro-clavate, rarely cylindrical, 36–54 µm long, 6.0–12.5 µm broad at apex, 5.0–11.5 µm at center, 5.0–8.5 µm at base, thin-walled; sterigmata four, straight, 4–7.5 × 0.9–1.5 µm; in fully mature basidiomata (e.g. Henkel 9514) consistently clavate, 20–25 µm long, with four short (~1 µm), highly reduced sterigmata. Basidiospores statismosporic, smooth, subfusiform, bilaterally symmetrical in all views, 12–18 × 5.5–8(–10) µm (mean = 14.7 ± 1.20 × 7.1 ± 0.91 µm; Qr = (1.5–)1.9–2.7, Qm = 2.1 ± 0.25; n = 61), light yellowish brown in H2O and KOH, often with one dextrinoid guttule, with a short pedicel ± l µm long, frequently released in tetrads. Cystidia and clamp connections absent.
Registration number: MB812362
Ectomycorrhiza: Pakaraimaea dipterocarpacea (confirmed), putatively with Dicymbe jenmannii
Distribution: Guyana
Commentary: Inference from molecular phylogenetics alligns this species with Tylopilus but without any stastical support. However, it appears to clearly belong to the Boletaceae.
Diagnosis: Basidiomata sequestrate, with a short stipe, orange brown peridium, brown, loculate gleba, with a short columella arising from a sterile pad, with smooth subfusoid basidisopores that are frequently dextrinoid and released in tetrads, lacking clamp connections and hymenial cystidia.
Macroscopic description: Basidiomata irregularly flattened-ovate, 7–12 mm tall, 12–16 mm broad, subfirm, softer with age; surface light grayish orange (5A5–5B5–5B6) to orangish brown (7C8–7D8–7E8) with occasional darker humic stains, unchanging with pressure, glabrous macroscopically, under hand lens a dense repent mat of light orange hyphae, with age viscid to nearly glutinous; base subtended by a short, concolorous stipe, this 1.5 × 1.5 mm, with a single concolorous hyphal cord. Peridium in longitudinal section extremely thin over apical ¾ (less than 0.25 mm), concolorous with surface, over basal ¼ thickening to 0.75 mm and there off-white, single-layered, separable. Gleba dark brown (6E7–6F7, 7E7–7F7) throughout, unchanging with exposure, of irregularly shaped locules with interior surfaces minutely brownish hispid under hand lens; locule walls translucent-gelatinous; columella arising from the thickened basal peridium, with a single narrow gelatinous vein extending to apex. Odor slightly of iodine; taste not obtained. Macrochemical reactions not obtained.
Microscopic description: Peridium 25–190 µm thick, single-layered, of tightly interwoven, repent hyphae, yellowish brown in KOH and H2O, becoming more parallel and hyaline toward gleba; individual hyphae 2–5 µm wide, thin-walled; terminal cells cylindrical to subcapitate, 19–36 × 2–3 µm. Glebal trama with a distinct mediostratum and lateral stratum; mediostratum hyaline in H2O and KOH, 12.4–29.6 µm wide, of parallel, slightly interwoven hyphae; individual hyphae 2–8 µm wide; lateral stratum divergent at a right angle from mediostratum, hyaline in H2O and KOH, grading imperceptibly into the densely interwoven subhymenium. Hymenium a palisade of tightly packed basidia and basidioles. Basidia faintly gray in H2O and KOH, changing in shape with maturity; in developing basidiomata (e.g. Henkel 9670) subclavate, infrequently cylindro-clavate, rarely cylindrical, 36–54 µm long, 6.0–12.5 µm broad at apex, 5.0–11.5 µm at center, 5.0–8.5 µm at base, thin-walled; sterigmata four, straight, 4–7.5 × 0.9–1.5 µm; in fully mature basidiomata (e.g. Henkel 9514) consistently clavate, 20–25 µm long, with four short (~1 µm), highly reduced sterigmata. Basidiospores statismosporic, smooth, subfusiform, bilaterally symmetrical in all views, 12–18 × 5.5–8(–10) µm (mean = 14.7 ± 1.20 × 7.1 ± 0.91 µm; Qr = (1.5–)1.9–2.7, Qm = 2.1 ± 0.25; n = 61), light yellowish brown in H2O and KOH, often with one dextrinoid guttule, with a short pedicel ± l µm long, frequently released in tetrads. Cystidia and clamp connections absent.
Registration number: MB812362
Ectomycorrhiza: Pakaraimaea dipterocarpacea (confirmed), putatively with Dicymbe jenmannii
Distribution: Guyana
Commentary: Inference from molecular phylogenetics alligns this species with Tylopilus but without any stastical support. However, it appears to clearly belong to the Boletaceae.