Leccinum tablense Halling & G. M. Mueller, Mycologia 95: 496. 2003.
Pileus 24.5 cm broad, at first convex, with age plano-convex, moist, even or irregularly pitted, becoming areolate or irregularly pitted; at first cocoa brown, then light brown or tan; margin even, when young cocoa brown, then light brown or tan; surface subvelutinous, becoming subtomentose; maculose color spots present, white; sterile appendiculate flaps absent. Flesh 68 mm thick, white, staining absent; odor mild; taste mild. Hymenophore tubulose, depressed. Tubes 914 mm long, white, becoming orangish white, unchanging when injured; pores 1 mm wide, white, then orangish white, unchanging when injured. Stipe 58 cm long, 58 mm wide, equal to subclavate, strict, dry; upper half when young finely scabrous, white, with age scabrous, white; lower half when young subscabrous ridged, white, with age subscabrous ridged or scabrous, white; s on upper half when young gray to black, ge black, er half when young dark gray or black, ge black; base white, staining not present. Stipe interior solid or soon hollow; flesh above when young white, with age white, staining not present; flesh at base when young white, with age whitish yellow, staining not present. Basal mycelium white.
Basidiospores 1416 µm long, 55.6 µm wide, mean Q = 2.83, smooth, subfusoid or fusoid, lightly dextrinoid, with KOH light brown melleous. Basidia 2835 µm long, 1214 µm wide, clavate, hyaline, 4 -sterigmate. Hymenial cystidia 5570 µm long, 1015 µm wide, more common towards edge of tubes, thin walled, hyaline, narrowly fusoid to subfusoid, encrusting pigment absent. Tube trama boletoid, hyaline to golden yellow, lateral strata elements 3.58 µm wide, subgelatinous. Pileipellis hyphae hymeniform and forming a palisade (several cells deep), in KOH yellow ochraceous, inamyloid; elements 1220 µm wide, subelongate to subisodiametric or cellular, smooth, thin walled, not gelatinized. Intercalary cells isodiametric to subisodiametric, 1228 µm long. Pileus trama interwoven, hyaline, inamyloid, with elements 3.514 µm wide, smooth, thin walled. Stipitipellis hyphae vertically oriented, parallel, giving rise to clusters of caulocystidia, clavate to subclavate or ventricose, typically subtended by isodiametric cells with gray brown contents or hyaline, with incrusting pigment absent. Stipe trama hyphae parallel, cylindric, hyaline, inamyloid. Clamp connections absent.
Mycorrhizal host: Quercus.
Leccinum tablense vaguely recalls features of L. talamancae, but unlike that taxon it does not exhibit any oxidation reactions in the exposed flesh; pink to reddish orange in the pileus and upper part of the stipe and the blue-green to deep blue in the lower part of the stipe. The hymeniform nature of the pileipellis also is reminiscent of L. talamancae, but in liieu of a description of fresh material they can be distinguished by spore size (1416 × 4.9--6.3 µm for L. tablense, and 17.522.5 × 4.96.3 µm for L. talamancae). Leccinum tablense also would fit the circumscription of subsection Pseudoscabra as recently outlined by Lannoy and Estades (1995).
Cite this publication as: Halling, R. E., G. M. Mueller, and M. J. Dallwitz. 1998 onwards. Leccinum and Phylloporus in Costa Rica: Descriptions, Illustrations, Identification, and Information Retrieval. Version: 13 Decmber 2006. http://www.nybg.org/bsci/res/hall/deltaindex.html. Dallwitz (1980) and Dallwitz, Paine and Zurcher (1993 onwards, 1998) should also be cited (see References).