Taxon Details: Leccinum viscosum Halling & B.Ortiz
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Narratives:
Family:
Boletaceae (Basidiomycota)
Boletaceae (Basidiomycota)
Scientific Name:
Leccinum viscosum Halling & B.Ortiz
Leccinum viscosum Halling & B.Ortiz
Primary Citation:
A new species of Leccinum (Basidiomycota, Boletales) from Belize
Brittonia 61: 172. 2009
A new species of Leccinum (Basidiomycota, Boletales) from Belize
Brittonia 61: 172. 2009
Accepted Name:
This name is currently accepted.
This name is currently accepted.
Type Specimens:
Specimen 1: Holotype -- R. E. Halling
Specimen 2: Paratype -- R. E. Halling
Specimen 3: Paratype -- R. E. Halling
Specimen 1: Holotype -- R. E. Halling
Specimen 2: Paratype -- R. E. Halling
Specimen 3: Paratype -- R. E. Halling
Description:
Protologue: Pileus 20-45 mm broad, convex to planoconvex, tacky to subviscid, subrugulose to rugulose at first, becoming reticulate-pitted, grayish orange to apricot yellow (5B6.5B4), then cinnamon brown to mustard brown (6E6, 5E6), lacking a sterile margin. Flesh white, staining pink then dark fuscous in pileus, with mild odor and taste. Tubes adnexed, yellowish white when young, becoming grayish orange (5B3) and staining pale cinnamon brown; pores concolorous, staining cinnamon brown. Stipe 40-110 mm long, 5-10 mm broad, curved, ±equal to subclavate, dry, white, scabrous, scabers white at first, becoming pale tan to pale caramel color, sometimes with a scattered pale pink background above, staining fuscous with handling, white at base, soon changing to pale blue green to greenish blue to deep blue at the base, and often slowly developing scattered orange pink or coral pink stains; interior white, changing to pinkish at apex, bluish green in the base. Basidiospores 12.6-17.5 × 4.9-6.3 µm, (n=20, x=15.4 × 5.6 µm, Q=2.75), smooth, fusoid to subfusoid, melleous in KOH, inamyloid. Basidia 28-35 × 10-13 µm, clavate, hyaline, 4-sterigmate. Hymenial cystidia 34-52 × 6-11 µm, more abundant at edge of tubes, narrowly subfusoid to subfusoid or subcylindric, hyaline, inamyloid, smooth and thin-walled. Tube trama boletoid, hyaline, with lateral strata elements 3.5-10.5 µm broad, subgelatinous with age. Pileipellis hyphae hymeniform and forming a loose palisade (several cells deep), embedded in a gelatinous matrix, hyaline in KOH, inamyloid, but with coagulated melleous content in Melzer's; elements 14-30 × 6-14 µm, subelongate to subclavate or short fusoid to subisodiametric, smooth, thin-walled. Pileus trama interwoven, hyaline, inamyloid, with elements 3.5-10.5 µm broad, smooth, thinwalled, with occasional oleiferous elements intermixed. Caulocystidia 18-57 × 8-24 µm, subfusoid to subclavate or clavate-mucronate, hyaline or rarely with a pale melleous content, smooth, thin-walled. Clamp connections absent.
Distribution and Ecology: Distribution and Ecology.—Gregarious, on sandy soil near Quercus peduncularis Née and Pinus caribaea Morelet. At present, known only from the Mountain Pine Ridge Reserve of western Belize.
Commentary: The hymeniform nature of the pileipellis and some of the oxidation reactions recall Leccinum talamancae Halling, Gómez & Lannoy (Halling, 1999) from Costa Rica, but the latter taxon has a dry pileus that often becomes areolate and is darkly pigmented, and never develops the coral pink stains on the stipe base exterior. Also, the stipe scabers are much darker in L. talamancae. While L. rugosiceps (Peck) Singer has a similar pileus and scaber pigmentation, similar oxidation reactions in the pileus flesh and the flesh of the stipe apex, that taxon does not have any stains at the base of the stipe and the pileus is dry, not viscid (see Halling & Mueller, 2003, 2005). Leccinum violaceotinctum B. Ortiz & T.J. Baroni, a sympatric taxon recently described from Belize, also has a viscid pileus and some similar oxidation reactions as L. viscosum. However, L. violaceotinctum has a smooth, even pileus surface (not rugulose or reticulate-pitted and composed of cylindric hyphae) that develops turquoise tints (not so in L. viscosum) and does not produce the coral pink stains on the stipe.
Protologue: Pileus 20-45 mm broad, convex to planoconvex, tacky to subviscid, subrugulose to rugulose at first, becoming reticulate-pitted, grayish orange to apricot yellow (5B6.5B4), then cinnamon brown to mustard brown (6E6, 5E6), lacking a sterile margin. Flesh white, staining pink then dark fuscous in pileus, with mild odor and taste. Tubes adnexed, yellowish white when young, becoming grayish orange (5B3) and staining pale cinnamon brown; pores concolorous, staining cinnamon brown. Stipe 40-110 mm long, 5-10 mm broad, curved, ±equal to subclavate, dry, white, scabrous, scabers white at first, becoming pale tan to pale caramel color, sometimes with a scattered pale pink background above, staining fuscous with handling, white at base, soon changing to pale blue green to greenish blue to deep blue at the base, and often slowly developing scattered orange pink or coral pink stains; interior white, changing to pinkish at apex, bluish green in the base. Basidiospores 12.6-17.5 × 4.9-6.3 µm, (n=20, x=15.4 × 5.6 µm, Q=2.75), smooth, fusoid to subfusoid, melleous in KOH, inamyloid. Basidia 28-35 × 10-13 µm, clavate, hyaline, 4-sterigmate. Hymenial cystidia 34-52 × 6-11 µm, more abundant at edge of tubes, narrowly subfusoid to subfusoid or subcylindric, hyaline, inamyloid, smooth and thin-walled. Tube trama boletoid, hyaline, with lateral strata elements 3.5-10.5 µm broad, subgelatinous with age. Pileipellis hyphae hymeniform and forming a loose palisade (several cells deep), embedded in a gelatinous matrix, hyaline in KOH, inamyloid, but with coagulated melleous content in Melzer's; elements 14-30 × 6-14 µm, subelongate to subclavate or short fusoid to subisodiametric, smooth, thin-walled. Pileus trama interwoven, hyaline, inamyloid, with elements 3.5-10.5 µm broad, smooth, thinwalled, with occasional oleiferous elements intermixed. Caulocystidia 18-57 × 8-24 µm, subfusoid to subclavate or clavate-mucronate, hyaline or rarely with a pale melleous content, smooth, thin-walled. Clamp connections absent.
Distribution and Ecology: Distribution and Ecology.—Gregarious, on sandy soil near Quercus peduncularis Née and Pinus caribaea Morelet. At present, known only from the Mountain Pine Ridge Reserve of western Belize.
Commentary: The hymeniform nature of the pileipellis and some of the oxidation reactions recall Leccinum talamancae Halling, Gómez & Lannoy (Halling, 1999) from Costa Rica, but the latter taxon has a dry pileus that often becomes areolate and is darkly pigmented, and never develops the coral pink stains on the stipe base exterior. Also, the stipe scabers are much darker in L. talamancae. While L. rugosiceps (Peck) Singer has a similar pileus and scaber pigmentation, similar oxidation reactions in the pileus flesh and the flesh of the stipe apex, that taxon does not have any stains at the base of the stipe and the pileus is dry, not viscid (see Halling & Mueller, 2003, 2005). Leccinum violaceotinctum B. Ortiz & T.J. Baroni, a sympatric taxon recently described from Belize, also has a viscid pileus and some similar oxidation reactions as L. viscosum. However, L. violaceotinctum has a smooth, even pileus surface (not rugulose or reticulate-pitted and composed of cylindric hyphae) that develops turquoise tints (not so in L. viscosum) and does not produce the coral pink stains on the stipe.