Boletellus dicymbophilus Fulgenzi & T.W.Henkel

  • Filed As

    Boletaceae
    Boletellus dicymbophilus Fulgenzi & T.W.Henkel ( isotype )

  • Collector(s)

    T. W. Henkel 8616, 25 Jul 2003

  • Location

    Guyana. Potaro-Siparuni. Pakaraima Mountains, Upper Potaro River, vicinity of Potaro Base Camp.

  • Habitat

    Rain forest. Dicymbe corymbosa. Solitary or in groups. Humic accumulations on large tree trunks.

  • Description

    Pileus 19-48 (82) mm broad, convex to planoconvex, red-brown (8E8-9E8-9F5) when immature, becoming brown (6E6-6F6) and then orange-tan (6C6) to yellow-tan (4C6) with age, rugulose to rugose throughout, velutinous, finely areolate with age (under lens), moist, margin slightly inrolled and entire; trama 1-3 mm thick at margin, 2-5 mm over tubes, 3-7 mm above stipe, white to cream, slightly browning with exposure, solid. Odor indistinct; flavor mild. Tubes 1-6 mm long at margin, 5-13 mm centrally, 4-8 mm at stipe, narrowly and shallowly depressed around stipe, with short decurrent tooth 1-2 mm long, concolorous with pores, instantly bluing (26E8) on exposure, eventually darkening to brown; pores progressing from yellow (4A7-4B7) to orangeyellow (4C8-5D8) to dark yellow (4A8-5B8), rapidly blue-green (26E7) with pressure, 0.5-1.5 per mm, isodiametric to angular with age. Stipe 41-60 (81) x 4-7 mm, equal, slightly enlarging at extreme base, red-brown (9D7-9E7) throughout, with handling becoming brown (7F6-7F7) to dark brown (8F5), finely longitudinally striate throughout, striations minutely pubescent (under lens), subreticulate at apex, base with brown (8F5) strigose hairs on lower 4-20 mm; trama brown (6E7-6F7) throughout to dark brown (7F7) to red-brown (8E4), unchanging, solid. Basidiospores olive (4D6) to olivaceous brown (4F7) in light to heavy deposit; 12-15 x 8-11 µm (mean = 13 x 9 µm; n = 25), Q range 1.2-1.7 (mean Q = 1.37), golden-olive in H2O and KOH, inamyloid, amygdaliform, usually uniguttulate, with 7-10 longitudinal ridges; ridges < 1 µm tall, dichotomously forked, occasionally nonforked, terminating in unequal lengths near apex, at extreme base all ridges converging at hilar appendage; hilar appendage 1-1.5 µm long. Basidia 43-48 x 12-15 µm, clavate, thinwalled, hyaline in H2O and KOH, with numerous refractive globules, these light golden in H2O, lighter in KOH; with 2, 3 or 4 sterigmata. Pleurocystidia frequent, 33-56 x 7-12 µm, projecting 22-49 (57) µm beyond the hymenial palisade, arising from the subhymenium, cylindrical to narrowly clavate; thinwalled, hyaline in H2O and KOH, with minute amber incrustations at basal and apical portions evident in Melzer's and H2O. Hymenophoral trama boletoid, strongly divergent; mediostratum 37-59.3 µm wide, of thin, slightly anastomosing hyphae, golden-orange in H2O, gelatinized and lighter in KOH; lateral stratum hyphae 1.2-2.5 µm wide, hyaline in H2O and KOH, nongelatinized. Pileipellis a two-layered trichodermial palisade, in mass golden in H2O, lighter in KOH; terminal cells 42-76.6 3 12.4-24.7 µm, most inflated and of variable shapes, oblong, cylindrical, napiform, vesiculate, to occasionally bluntly ventricose; penultimate cells interwoven, less inflated, hyaline in H2O and KOH, inamyloid. Pileus trama interwoven; hyphae 6.2-12.4 µm wide, thinwalled, faint golden in H2O, hyaline in KOH, regularly septate, with external dark burgundy acerose crystals evident in KOH, Melzer's, and H2O. Stipitipellis an interwoven trichodermial palisade of cylindrical elements giving rise to inflated terminal cells, in mass golden in H2O, lighter in KOH; terminal cells 4-66.7 (77) x 4.9-7.4 µm wide, thinwalled, cylindrical to aciculate; hyaline in H2O and KOH, inamyloid. Stipe trama of densely packed longitudinal hyphae, these 5-10 µm wide, hyaline in H2O and KOH, with external dark burgundy acerose crystals evident in KOH, Meltzer's and H2O. Clamp connections absent. Macrochemical reactions: NH4OH burgundy on pileus, orange on pileus trama, burgundy on stipe base trama; KOH burgundy to orange on pileus, dark orange on pileus trama, burgundy on stipe base trama.

  • Identifiers

    NY Barcode: 1034399

    Occurrence ID: a2ee8857-8c34-4ce2-925b-66309f2d4c8d

  • Feedback

    Send comments on this specimen record

  • Region

    South America

  • Country

    Guyana

  • State/Province

    Potaro-Siparuni

  • Locality

    Pakaraima Mountains, Upper Potaro River, vicinity of Potaro Base Camp

  • Elevation

    Alt. 710 - 750 m. (2329 - 2461 ft.)

  • Coordinates

    5.30133, -59.9112

  • Georeferencing Method

    Coordinates determined at another institution.

  • Distribution

    Map all specimens of this taxon

	NEW YORK
Ouyana	botanical*/
Boletellus dicymbophilus garden T.W. Henkel 8616 ISOTYPE
nHyy.yP.?.K.PPTAMICAL GARDFi^
01034399 " "'
Boletellus dicymbophilus Fulgenzi and T.W. Henkel
Latin diagnosis'. Pileus porphyreus, convexus vel planus, rugosus, velutinus, postea subtiliter areolatus, 19-48 mm latus; trama alba, immutabilis. Stipes brunneus, longitudinaliter striatus, ad tactum atrans, 41-60 (81) x 4-7 mm. Basidiosporae olivaceo-brunneae in massa, amygdaliformes, longitudinaliter porcatae, 12-15 * 8-11 pm. Fructificatio insidens trunco Dicymbe arborum.
HOLOTYPE: Henkel 8616 (BRG; ISOTYPE: HSU, NY; MycoBank #MB 511184)
My oologia 100(3): 490-495 (2008)
The specimen was sampled for the molecular phylogenetic work. 02/09/2019 T. Svetasheva (Tula State Lev Tolstoy Pedagogical University, Russia)
 --?	iwi	ur\
Nikodemweg 5 A-6020 Innsbruck
el - or. !<t
01034399